[Bug 56461] New: NV11 black screen & kernel hang on loading nouveaufb

[Bug 56461] New: NV11 black screen & kernel hang on loading nouveaufb

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=56461

          Priority: medium
            Bug ID: 56461
          Assignee: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
           Summary: NV11 black screen & kernel hang on loading nouveaufb
        QA Contact: xorg-team-go0+a7rfsptAfugRpC6u6w@public.gmane.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: chris-Tc38MJj1weLQT0dZR+AlfA@public.gmane.org
          Hardware: x86 (IA32)
            Status: NEW
           Version: git
         Component: Driver/nouveau
           Product: xorg

Created attachment 69149
  --> https://bugs.freedesktop.org/attachment.cgi?id=69149&action=edit
dmesg output prior to modprobe nouveau

My NV11 [GeForce2 Go] system hangs with a black screen when loading the nouveau
framebuffer.

After fixing #42384 - many thanks - my system was working. It still works if I
load kernel 3.2.7-1.fc16.i686. Later kernels, including one compiled from
recent commit 214e40f of nouveau/master fail.

I managed to some console messages by booting with a serial console into VGA
text mode with nouveau blacklisted, then modprobing nouveau manually. I'm
attaching the dmesg output from before the modprobe and the console output from
after the modprobe.

I'm also attaching the dmesg output (including the post-modprobe output) from
the working 3.2 kernel.

I'm guessing it will be a memory allocation problem as my ancient system has a
very large screen for a laptop - 1600x1200 and only 64MiB of VRAM.

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[Bug 56461] NV11 black screen & kernel hang on loading nouveaufb

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=56461

--- Comment #1 from Chris Paulson-Ellis <chris-Tc38MJj1weLQT0dZR+AlfA@public.gmane.org> ---
Created attachment 69150
  --> https://bugs.freedesktop.org/attachment.cgi?id=69150&action=edit
serial console output after modprobe nouveau - until kernel hang

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[Bug 56461] NV11 black screen & kernel hang on loading nouveaufb

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=56461

--- Comment #2 from Chris Paulson-Ellis <chris-Tc38MJj1weLQT0dZR+AlfA@public.gmane.org> ---
Created attachment 69151
  --> https://bugs.freedesktop.org/attachment.cgi?id=69151&action=edit
dmesg output for working kernel

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[Bug 56461] NV11 black screen & kernel hang on loading nouveaufb

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https://bugs.freedesktop.org/show_bug.cgi?id=56461

--- Comment #3 from Marcin Slusarz <marcin.slusarz-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
Please attach VBIOS image. See
http://nouveau.freedesktop.org/wiki/DumpingVideoBios for description how to
obtain it.

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[Bug 56461] NV11 black screen & kernel hang on loading nouveaufb

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=56461

--- Comment #4 from Chris Paulson-Ellis <chris-Tc38MJj1weLQT0dZR+AlfA@public.gmane.org> ---
Created attachment 69965
  --> https://bugs.freedesktop.org/attachment.cgi?id=69965&action=edit
Video BIOS as produced by vbtracetool

Video BIOS as requested - thank you for caring about my ancient hardware.
Chris.

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[Bug 56461] NV11 black screen & kernel hang on loading nouveaufb

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=56461

--- Comment #5 from Marcin Slusarz <marcin.slusarz-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
Created attachment 69969
  --> https://bugs.freedesktop.org/attachment.cgi?id=69969&action=edit
fix

This should fix it.

(Condition checking DCB entry sanity was accidentally inverted during rewrite.)

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[Bug 56461] NV11 black screen & kernel hang on loading nouveaufb

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=56461

--- Comment #6 from Chris Paulson-Ellis <chris-Tc38MJj1weLQT0dZR+AlfA@public.gmane.org> ---
Created attachment 69973
  --> https://bugs.freedesktop.org/attachment.cgi?id=69973&action=edit
console output of hang with patch

With that patch it's still hanging the kernel with a black screen. I've
attached the serial console output from modprobe nouveau.

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[Bug 56461] NV11 black screen & kernel hang on loading nouveaufb

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https://bugs.freedesktop.org/show_bug.cgi?id=56461

--- Comment #7 from Marcin Slusarz <marcin.slusarz-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
Created attachment 69982
  --> https://bugs.freedesktop.org/attachment.cgi?id=69982&action=edit
timer fix

If this patch won't fix it, then I'm afraid you need to bisect this bug.

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[Bug 56461] NV11 black screen & kernel hang on loading nouveaufb

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https://bugs.freedesktop.org/show_bug.cgi?id=56461

--- Comment #8 from Chris Paulson-Ellis <chris-Tc38MJj1weLQT0dZR+AlfA@public.gmane.org> ---
Okay, that was... interesting. I haven't quite managed to pin it down to a
single commit, but here is what I've found out.

I did a manual bisect, only looking at commits that make changes in
drivers/gpu/drm/nouveau. The area of interest had unrelated problems causing a
NULL pointer dereference and a compile problem. I fixed this by cherry picking
the following 2 commits each time I tested a new commit:

dea7e0ac  ttm: fix agp since ttm tt rework
095f979a  drm/nouveau/pm: fix build with HWMON off

With these changes, the last nouveau commit that works is:

d2edab4a  drm/nouveau/pm: fix missing volt changes when boot voltage is
undefined

The next 3 nouveau commits all fail, but with a NULL pointer dereference in
nouveau_hw_load_state() rather than with a black-screen hang:

2a44e499  drm/nouveau/disp: introduce proper init/fini, separate from
create/destroy
cf41d53b  drm/nouveau: re-jig fbcon suspend/resume process a little
1772fcc6  drm/nv50/disp: fix evo for create/init + destroy/fini split

In the next nouveau commit, the NULL pointer dereference has gone and it fails
with the black-screen hang:

f62b27db  drm/nouveau: shutdown display on suspend/hibernate

The stack trace for the 3 commits that oops rather than hang is as follows:

[   51.360006] Call Trace:
[   51.360006]  [<f0c78c69>] ? nv_crtc_restore+0x52/0x10f [nouveau]
[   51.360006]  [<f0cd3215>] ? ch7006_write+0x1f/0x50 [ch7006]
[   51.360006]  [<f0c7a623>] ? nv04_display_init+0x48/0x58 [nouveau]
[   51.360006]  [<f0c3214a>] ? nouveau_display_create+0x211/0x3f2 [nouveau]
[   51.360006]  [<f0c12b16>] ? nouveau_card_init+0x138a/0x1459 [nouveau]
[   51.360006]  [<f0c11744>] ? nouveau_stub_init+0x3/0x3 [nouveau]
[   51.360006]  [<f0c13092>] ? nouveau_load+0x3ce/0x6ad [nouveau]
[   51.360006]  [<f0ade3e0>] ? drm_get_pci_dev+0x13e/0x249 [drm]
[   51.360006]  [<c104580d>] ? __blocking_notifier_call_chain+0x47/0x4f
[   51.360006]  [<c113eb56>] ? pci_device_probe+0x47/0x68
[   51.360006]  [<c11ab567>] ? driver_probe_device+0x4a/0x13a
[   51.360006]  [<c113ea91>] ? pci_match_device+0x8b/0x99
[   51.360006]  [<c11ab6b9>] ? __driver_attach+0x62/0x64
[   51.360006]  [<c11ab657>] ? driver_probe_device+0x13a/0x13a
[   51.360006]  [<c11aaa38>] ? bus_for_each_dev+0x3f/0x63
[   51.360006]  [<c113eac2>] ? pci_dev_put+0xd/0xd
[   51.360006]  [<c11ab329>] ? driver_attach+0x19/0x1e
[   51.360006]  [<c11ab657>] ? driver_probe_device+0x13a/0x13a
[   51.360006]  [<c11ab0a8>] ? bus_add_driver+0x17d/0x24d
[   51.360006]  [<c113eac2>] ? pci_dev_put+0xd/0xd
[   51.360006]  [<c11ab8a9>] ? driver_register+0x57/0xec
[   51.360006]  [<f0ade51c>] ? drm_pci_init+0x31/0xe6 [drm]
[   51.360006]  [<c113ef22>] ? __pci_register_driver+0x31/0x8f
[   51.360006]  [<c1001027>] ? do_one_initcall+0x27/0x150
[   51.360006]  [<c108b650>] ? __vunmap+0xa0/0xd1
[   51.360006]  [<f0cb6000>] ? 0xf0cb5fff
[   51.360006]  [<c1054f97>] ? sys_init_module+0xccc/0x18f2
[   51.360006]  [<c109be00>] ? sys_close+0x66/0xa7
[   51.360006]  [<c127fb10>] ? sysenter_do_call+0x12/0x26
[   51.360006] Code: 00 28 60 00 f6 05 10 83 ca f0 10 0f 85 1e 12 00 00 8b 83
00 02 00 00 8b 50 18 01 ea 89 c8 e8 45 fd 50 d0 8b 83 78 01 00 00 31 c9 <8b> 2c
b8 85 ed 0f 95 c1 83 ff 01 19 ed 81 e5 00 e0 ff ff 81 c5
[   51.360006] EIP: [<f0c227fc>] nouveau_hw_load_state+0x9a5/0x26d9 [nouveau]
SS:ESP 0068:ee665cc4

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[Bug 56461] NV11 black screen & kernel hang on loading nouveaufb

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=56461

--- Comment #9 from Chris Paulson-Ellis <chris-Tc38MJj1weLQT0dZR+AlfA@public.gmane.org> ---
Hi,

I only just realised that you sent me a second patch (I thought you were
referring to the first patch, so I went and did the bisect as per my previous
message). I've just tried the second patch against nouveau HEAD. Unfortunately
it causes a NULL pointer dereference. I think this is because when this line in
nv04_timer_init...

n = nouveau_hw_get_clock(((struct nouveau_drm *)nouveau_client(priv))->dev,
PLL_CORE);

...calls nouveau_client() it gets NULL, because the parent of nv04_timer_priv
is a nouveau_device, not a nouveau_drm. I can't see any way to get a pointer to
the drm_device from nv04_timer_init, so I don't think calling
nouveau_hw_get_clock from here is possible.

Chris.

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[Bug 56461] NV11 black screen & kernel hang on loading nouveaufb

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https://bugs.freedesktop.org/show_bug.cgi?id=56461

--- Comment #10 from Emil Velikov <emil.l.velikov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
Created attachment 71248
  --> https://bugs.freedesktop.org/attachment.cgi?id=71248&action=edit
timer fix, take two

Sweet, can you the second version of the timer fix. Apply on top of the
original patch 69969

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[Bug 56461] NV11 black screen & kernel hang on loading nouveaufb

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https://bugs.freedesktop.org/show_bug.cgi?id=56461

--- Comment #11 from Emil Velikov <emil.l.velikov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
* if using latest git, only the patch mentioned in commit 10 should be
necessary

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[Bug 56461] NV11 black screen & kernel hang on loading nouveaufb

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=56461

Emil Velikov <emil.l.velikov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #71248|0                           |1
        is obsolete|                            |

--- Comment #12 from Emil Velikov <emil.l.velikov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
Comment on attachment 71248
  --> https://bugs.freedesktop.org/attachment.cgi?id=71248
timer fix, take two

Appropriate solution here would be to use

n = nouveau_hw_get_clock(pci_get_drvdata(device->pdev), PLL_CORE);

Note that this will will lead to NULL dereff in nouveau_hw_get_pllvals(). The
function uses nouveau_drm, which is created at a later stage

Unless someone has an another idea, consider bisecting the issue

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[Bug 56461] NV11 black screen & kernel hang on loading nouveaufb

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https://bugs.freedesktop.org/show_bug.cgi?id=56461

--- Comment #13 from Chris Paulson-Ellis <chris-Tc38MJj1weLQT0dZR+AlfA@public.gmane.org> ---
With that modification, the PTIMER warning goes away, but unfortunately I still
have a hung machine with a black screen (serial console output below).

I did the bisect and got it down to one of 4 nouveau commits - 3 that NULL
deref, then 1 that hangs - see comment 8 above.

Chris.

# modprobe nouveau
[   94.851054] wmi: Mapper loaded
[   95.027154] [drm] Initialized drm 1.1.0 20060810
[   95.543293] nouveau  [  DEVICE][0000:01:00.0] BOOT0  : 0x011200b2
[   95.553280] nouveau  [  DEVICE][0000:01:00.0] Chipset: NV11 (NV11)
[   95.559722] nouveau  [  DEVICE][0000:01:00.0] Family : NV10
[   95.567178] nouveau  [   VBIOS][0000:01:00.0] checking PRAMIN for image...
[   95.641819] nouveau  [   VBIOS][0000:01:00.0] ... checksum invalid
[   95.648038] nouveau  [   VBIOS][0000:01:00.0] checking PROM for image...
[   95.655178] nouveau  [   VBIOS][0000:01:00.0] ... signature not found
[   95.661697] nouveau  [   VBIOS][0000:01:00.0] checking ACPI for image...
[   95.668473] nouveau  [   VBIOS][0000:01:00.0] ... signature not found
[   95.674986] nouveau  [   VBIOS][0000:01:00.0] checking PCIROM for image...
[   95.682106] nouveau  [   VBIOS][0000:01:00.0] ... checksum invalid
[   95.688415] nouveau  [   VBIOS][0000:01:00.0] using image from PRAMIN
[   95.694932] nouveau  [   VBIOS][0000:01:00.0] BMP version 5.14
[   95.701085] nouveau  [   VBIOS][0000:01:00.0] version 03.11.01.44
[   95.708967] nouveau  [     PFB][0000:01:00.0] RAM type: DDR1
[   95.720366] nouveau  [     PFB][0000:01:00.0] RAM size: 16 MiB
[   95.726454] nouveau  [     PFB][0000:01:00.0]    ZCOMP: 0 tags
[   95.737623] agpgart-intel 0000:00:00.0: AGP 2.0 bridge
[   95.742868] agpgart-intel 0000:00:00.0: putting AGP V2 device into 4x mode
[   95.749841] nouveau 0000:01:00.0: putting AGP V2 device into 4x mode
[   95.756394] [TTM] Zone  kernel: Available graphics memory: 386962 kiB
[   95.762940] [TTM] Initializing pool allocator
[   95.767609] nouveau  [     DRM] VRAM: 15 MiB
[   95.772083] nouveau  [     DRM] GART: 64 MiB
[   95.776432] nouveau  [     DRM] BMP version 5.20
[   95.781128] nouveau  [     DRM] DCB version 1.5
[   95.785740] nouveau  [     DRM] DCB outp 00: f0003f00 000088b8
[   95.791655] nouveau  [     DRM] DCB outp 01: f2045f14 0000ffff
[   95.797570] nouveau  [     DRM] DCB outp 02: f4204011 ffffffff
[   95.803705] nouveau  [     DRM] BIOS FP mode: 1600x1200 (162000kHz pixel
clock)
[   95.811877] nouveau  [     DRM] Saving VGA fonts
[   95.899625] nouveau  [     I2C][0000:01:00.0] detected TV encoder: ch7006
[   95.995616] ch7006 1-0075: Detected version ID: 50
[   96.039234] [drm] Supports vblank timestamp caching Rev 1 (10.10.2010).
[   96.045928] [drm] No driver support for vblank timestamp query.
[   96.077240] nouveau  [     DRM] 0 available performance level(s)
[   96.083444] nouveau  [     DRM] c: core 17MHz memory 332MHz
[   96.091238] nouveau  [     DRM] MM: using M2MF for buffer copies
[   96.172664] nouveau  [     DRM] allocated 1600x1200 fb: 0x8000, bo ede66400
[   96.179814] fbcon: nouveaufb (fb0) is primary device

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[Bug 56461] NV11 black screen & kernel hang on loading nouveaufb

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https://bugs.freedesktop.org/show_bug.cgi?id=56461

--- Comment #14 from Emil Velikov <emil.l.velikov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
Created attachment 71361
  --> https://bugs.freedesktop.org/attachment.cgi?id=71361&action=edit
Disable TV detection

This patch will remove the TV detection on your nv11.
Thus it will workaround the NULL dereffs and let you complete the bisect

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[Bug 56461] NV11 black screen & kernel hang on loading nouveaufb

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=56461

--- Comment #15 from Chris Paulson-Ellis <chris-Tc38MJj1weLQT0dZR+AlfA@public.gmane.org> ---
It still NULL derefd with that patch - in the same place, but with a different
call stack. However, after looking at where it was happening, I found another
commit to cherry-pick that fixes it:

afada5e0  drm/nv04/disp: disable vblank interrupts when disabling display

The first of the commits that was previously NULL derefing is now black screen
hanging instead, so I think I've found the problem commit - 2a44e499.

To recap...

The last working commit is d2edab4a with dea7e0ac & 095f979a cherry-picked.

The first hanging commit is 2a44e499 with dea7e0ac, 095f979a & afada5e0
cherry-picked.

I'm attaching the console output for these 2 runs.

Chris.

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[Bug 56461] NV11 black screen & kernel hang on loading nouveaufb

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=56461

--- Comment #16 from Chris Paulson-Ellis <chris-Tc38MJj1weLQT0dZR+AlfA@public.gmane.org> ---
Created attachment 71364
  --> https://bugs.freedesktop.org/attachment.cgi?id=71364&action=edit
console output for last working commit

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[Bug 56461] NV11 black screen & kernel hang on loading nouveaufb

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=56461

--- Comment #17 from Chris Paulson-Ellis <chris-Tc38MJj1weLQT0dZR+AlfA@public.gmane.org> ---
Created attachment 71365
  --> https://bugs.freedesktop.org/attachment.cgi?id=71365&action=edit
console output for first hanging commit

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[Bug 56461] NV11 black screen & kernel hang on loading nouveaufb

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=56461

--- Comment #18 from Emil Velikov <emil.l.velikov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
The patch cleans up the create-> init || fini -> destroy paths

In the original code, nv04_display_init was only executed during resume
(disregard that it's executed twice)
* eng[i]->init()
* engine->display.init()

Using 2a44e499 with dea7e0ac, 095f979a & afada5e0 cherry picked
* try to suspend/resume after nouveau is loaded
* sprinkle some nv_info() in the nv04_dfp_restore() codepath to establish what
exactly has caused the issue. I would assume that some encoder/connector may
not have yet been completely setup

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[Bug 56461] NV11 black screen & kernel hang on loading nouveaufb

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=56461

--- Comment #19 from Marcin Slusarz <marcin.slusarz-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
Created attachment 71403
  --> https://bugs.freedesktop.org/attachment.cgi?id=71403&action=edit
dpms fix

This should fix it - now for real ;P

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[Bug 56461] NV11 black screen & kernel hang on loading nouveaufb

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=56461

--- Comment #20 from Chris Paulson-Ellis <chris-Tc38MJj1weLQT0dZR+AlfA@public.gmane.org> ---
We're getting there!

Your fix worked - for a few minutes - when applied to the previously hanging
2a44e499 with dea7e0ac, 095f979a & afada5e0 cherry-picked.

When applied to the nouveau HEAD, Linux no longer hangs, but the display isn't
driven properly - the LCD goes white, then fades to black.

I'll attach my current patch to nouveau HEAD and the corresponding console
output.

Chris.

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[Bug 56461] NV11 black screen & kernel hang on loading nouveaufb

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=56461

--- Comment #21 from Chris Paulson-Ellis <chris-Tc38MJj1weLQT0dZR+AlfA@public.gmane.org> ---
Created attachment 71471
  --> https://bugs.freedesktop.org/attachment.cgi?id=71471&action=edit
fixes currently being applied to nouveau HEAD

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[Bug 56461] NV11 black screen & kernel hang on loading nouveaufb

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=56461

--- Comment #22 from Chris Paulson-Ellis <chris-Tc38MJj1weLQT0dZR+AlfA@public.gmane.org> ---
Created attachment 71472
  --> https://bugs.freedesktop.org/attachment.cgi?id=71472&action=edit
console output with current HEAD + fixes

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[Bug 56461] NV11 black screen & kernel hang on loading nouveaufb

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=56461

--- Comment #23 from Marcin Slusarz <marcin.slusarz-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
This is probably another bug (you are really lucky ;). I don't see anything
obvious in your latest log, so you could bisect it again - now between 2a44e499
with nv04_dfp.c fix (and other cherry-picks when necessary) and nouveau HEAD.

Is timer/nv04.c change needed for 2a44e499 to light up your monitor?

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[Bug 56461] NV11 black screen & kernel hang on loading nouveaufb

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=56461

--- Comment #24 from Chris Paulson-Ellis <chris-Tc38MJj1weLQT0dZR+AlfA@public.gmane.org> ---
(In reply to comment #23)
> This is probably another bug (you are really lucky ;).

I will bisect again. Don't hold your breath!

> Is timer/nv04.c change needed for 2a44e499 to light up your monitor?

No. I'm only using it when running the patched nouveau git HEAD. Even then I
can leave it out without anything changing - It just suppresses this warning:
nouveau W[  PTIMER][0000:01:00.0] unknown input clock freq

When running the patched git HEAD... Although the LCD is not being driven, the
driver isn't completely dead. I can start and stop X and the screen will go
white, then fade to black each time I do it. This suggests that the backlight
control & power management are okay, but the display timings are wrong. Looking
at the working & broken console output, they both show the same pixel clock. Is
there some way to get the driver to output more verbose display timing info
(fbset -i shows all zeros in the timing line in both the working & non-working
cases)?

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[Bug 56461] NV11 black screen & kernel hang on loading nouveaufb

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=56461

--- Comment #25 from Chris Paulson-Ellis <chris-Tc38MJj1weLQT0dZR+AlfA@public.gmane.org> ---
I've been bisecting and it appears that there are at least 2 further
regressions...

At one point in the bisection, the display goes from working to visible, but
with what look like hsync problems. I can see all the lines on the display, but
each line is shifting horizontally by about 16 pixels or so - giving a
shifting, fuzzy picture.

I've pinned this problem down to the following commit:

486a45c2  drm/nouveau/i2c: do parsing of i2c-related vbios info in
nouveau_i2c.c

There are no differences in the console output between this commit and its
working parent commit.

Much later in the bisection, this hsync problem is replaced with the
fade-to-black problem I described before. I haven't finished bisecting this
yet, but will continue.

Chris.

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[Bug 56461] NV11 black screen & kernel hang on loading nouveaufb

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=56461

--- Comment #26 from Chris Paulson-Ellis <chris-Tc38MJj1weLQT0dZR+AlfA@public.gmane.org> ---
I've completed the bisection. The good news is that the 'hsync' problem
mentioned above, although present for a large part of the history, is fixed
before the fade-to-black problem occurs. The bad news is the the problem commit
is rather a large one:

cb75d97e  drm/nouveau: implement devinit subdev, and new init table parser

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[Bug 56461] NV11 black screen & kernel hang on loading nouveaufb

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https://bugs.freedesktop.org/show_bug.cgi?id=56461

--- Comment #27 from Marcin Slusarz <marcin.slusarz-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
Are there any differences in dmesg before and after this commit?
If the answer is "no", please attach at least one of them (both if "yes").

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https://bugs.freedesktop.org/show_bug.cgi?id=56461

--- Comment #28 from Marcin Slusarz <marcin.slusarz-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
BTW, did you remember to cherry-pick 3bb076af2ae571a48465972d5747175cec3564cd
(upstream version of the fix from comment 5) during bisection?

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[Bug 56461] NV11 black screen & kernel hang on loading nouveaufb

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=56461

--- Comment #29 from Chris Paulson-Ellis <chris-Tc38MJj1weLQT0dZR+AlfA@public.gmane.org> ---
I didn't include 3bb076af during this bisect on the basis that it made no
difference when running nouveau HEAD. I have now retested the problem commit
cb75d97e and it's parent 70790f4f, both with 3bb076af cherry-picked.

Things just get more complicated... Although the fade-to-black problem hasn't
changed, including 3bb076af makes the previously working parent commit exhibit
the 'hsync' problem I described before!

All tests include the dpms-fix patch from comment 19 to prevent the original
hard-hang problem.

In summary:

1) 70790f4f + dpms-fix             -  works
2) 70790f4f + 3bb076af + dpms-fix  -  the 'hsync' problem reappears!
3) cb75d97e + dpms-fix             -  fades to black
4) cb75d97e + 3bb076af + dpms-fix  -  fades to black

There's quite a bit of difference in the console logs between 70790f4f &
cb75d97e, but nothing obvious (to me). I'm attaching console logs for cases 1,
2 & 4.

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[Bug 56461] NV11 black screen & kernel hang on loading nouveaufb

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

[-- Attachment #1.1: Type: text/plain, Size: 364 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=56461

--- Comment #30 from Chris Paulson-Ellis <chris-Tc38MJj1weLQT0dZR+AlfA@public.gmane.org> ---
Created attachment 71755
  --> https://bugs.freedesktop.org/attachment.cgi?id=71755&action=edit
console output for working 70790f4f + dpms fix

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[Bug 56461] NV11 black screen & kernel hang on loading nouveaufb

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

[-- Attachment #1.1: Type: text/plain, Size: 383 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=56461

--- Comment #31 from Chris Paulson-Ellis <chris-Tc38MJj1weLQT0dZR+AlfA@public.gmane.org> ---
Created attachment 71756
  --> https://bugs.freedesktop.org/attachment.cgi?id=71756&action=edit
console output for 'hsync' problem 70790f4f + 3bb076af + dpms fix

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[Bug 56461] NV11 black screen & kernel hang on loading nouveaufb

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

[-- Attachment #1.1: Type: text/plain, Size: 383 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=56461

--- Comment #32 from Chris Paulson-Ellis <chris-Tc38MJj1weLQT0dZR+AlfA@public.gmane.org> ---
Created attachment 71757
  --> https://bugs.freedesktop.org/attachment.cgi?id=71757&action=edit
console output for fading to black cb75d97e + 3bb076af + dpms fix

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[Bug 56461] NV11 black screen & kernel hang on loading nouveaufb

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=56461

--- Comment #33 from Marcin Slusarz <marcin.slusarz-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
Does booting with nouveau.agpmode=0 and/or nouveau.config=DEVINIT=NvForcePost=1
change anything? (please test all 3 combinations)

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[Bug 56461] NV11 black screen & kernel hang on loading nouveaufb

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

[-- Attachment #1.1: Type: text/plain, Size: 769 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=56461

--- Comment #34 from Ondrej Zary <linux-ZCIryABCsrmttCpgsWEBFmD2FQJk+8+b@public.gmane.org> ---
I have the same problem on DELL Latitude C810 laptop. 3.2 is the latest working
kernel, 3.3-rc1 does not work (LCD fades to white, then backlight turns off and
machine hangs).

d2edab4acffb35a6e24259886d377774efd37e6e is the latest working version
(with dea7e0ac45fd28f90bbc38ff226d36a9f788efbf added to fix AGP crash)

2a44e4997c5fee8e1da1589ff57e0bd1c53f03ce is the first bad commit. It oopses in
nv_load_state_ext (dev->vblank_enabled is NULL). With line 1024 in nouveau_hw.c
commented out, the oops is gone and the fade&hang problem appears.

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[Bug 56461] NV11 black screen & kernel hang on loading nouveaufb

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

[-- Attachment #1.1: Type: text/plain, Size: 399 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=56461

--- Comment #35 from Ondrej Zary <linux-ZCIryABCsrmttCpgsWEBFmD2FQJk+8+b@public.gmane.org> ---
70790f4f (+dpms-fix) works for me too and cb75d97e (+dpms-fix) does not.

Does not work even with any combination of nouveau.agpmode=0 and
nouveau.config=DEVINIT=NvForcePost=1

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[Bug 56461] NV11 black screen & kernel hang on loading nouveaufb

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https://bugs.freedesktop.org/show_bug.cgi?id=56461

--- Comment #36 from Chris Paulson-Ellis <chris-Tc38MJj1weLQT0dZR+AlfA@public.gmane.org> ---
(In reply to comment #33)
> Does booting with nouveau.agpmode=0 and/or
> nouveau.config=DEVINIT=NvForcePost=1 change anything? (please test all 3
> combinations)

For these tests, I'm working with nouveau HEAD 73e5cf2d + dpms-fix.

Doing "modprobe nouveau" results in the fade-to-black problem as before - as do
all the following tests.

Doing "modprobe nouveau apgmode=0" removes the console messages about AGP 4x
mode and changes the GART aperture from 64 MiB to 128 MiB.

Doing "modprobe nouveau config=DEVINIT=NvForcePost=1" adds a console message
about "running init tables", changes the VRAM size from 15 MiB to 31 MiB (!)
and results in a never ending stream of PFIFO errors.

Doing "modprobe nouveau apgmode=0 config=DEVINIT=NvForcePost=1" has the
expected console changes from the 2 tests above, but with a GPU lockup error
instead of the PFIFO errors.

I'll attach console logs for the above tests.

Chris.

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[Bug 56461] NV11 black screen & kernel hang on loading nouveaufb

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https://bugs.freedesktop.org/show_bug.cgi?id=56461

--- Comment #37 from Chris Paulson-Ellis <chris-Tc38MJj1weLQT0dZR+AlfA@public.gmane.org> ---
Created attachment 72178
  --> https://bugs.freedesktop.org/attachment.cgi?id=72178&action=edit
console output for plain modprobe nouveau

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[Bug 56461] NV11 black screen & kernel hang on loading nouveaufb

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https://bugs.freedesktop.org/show_bug.cgi?id=56461

--- Comment #38 from Chris Paulson-Ellis <chris-Tc38MJj1weLQT0dZR+AlfA@public.gmane.org> ---
Created attachment 72179
  --> https://bugs.freedesktop.org/attachment.cgi?id=72179&action=edit
console output for modprobe nouveau apgmode=0

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[Bug 56461] NV11 black screen & kernel hang on loading nouveaufb

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https://bugs.freedesktop.org/show_bug.cgi?id=56461

--- Comment #39 from Chris Paulson-Ellis <chris-Tc38MJj1weLQT0dZR+AlfA@public.gmane.org> ---
Created attachment 72180
  --> https://bugs.freedesktop.org/attachment.cgi?id=72180&action=edit
console output for modprobe nouveau config=DEVINIT=NvForcePost=1

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[Bug 56461] NV11 black screen & kernel hang on loading nouveaufb

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https://bugs.freedesktop.org/show_bug.cgi?id=56461

--- Comment #40 from Chris Paulson-Ellis <chris-Tc38MJj1weLQT0dZR+AlfA@public.gmane.org> ---
Created attachment 72181
  --> https://bugs.freedesktop.org/attachment.cgi?id=72181&action=edit
console output for modprobe nouveau apgmode=0 config=DEVINIT=NvForcePost=1

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[Bug 56461] NV11 black screen & kernel hang on loading nouveaufb

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=56461

--- Comment #41 from Chris Paulson-Ellis <chris-Tc38MJj1weLQT0dZR+AlfA@public.gmane.org> ---
Hi,

I've been looking at the 'hsync' problem I first mentioned in comment 25. This
problem seems to be caused by any interaction with i2c bus 2 and was uncovered
by commit 486a45c2, because it fixed a previous bug...

My VBIOS lists 3 i2c buses. Bus 0 is referenced by DCB entry 0 - 
OUTPUT_ANALOGUE. Bus 1 is referenced by DCB entries 1 & 2 - OUTPUT_LVDS &
OUTPUT_TV.

Prior to 486a45c2, bus 2 is never properly driven because nouveau_i2c_init() is
called without there having been a call to read_dcb_i2c_entry() for index 2, so
the bit-bang i2c adapter gets set up with 0 for the rd & wr variables (a later
commit renames these to sense & drive). Surprisingly, the resulting incorrect
CRTC register read/writes don't seem to trash the system and everything works
okay.

Commit 486a45c2 fixes the bug by parsing all 3 i2c entries up-front, so bus 2
gets a bit-bang i2c adapter with sensible rd & wr values. However, any access
to this bus seems to cause the display to show the 'hsync' problem. The only
reference to the bus is from nouveau_temp_probe_i2c(), so I've worked around
the problem with the following hack:

--- a/drivers/gpu/drm/nouveau/nouveau_temp.c
+++ b/drivers/gpu/drm/nouveau/nouveau_temp.c
@@ -287,11 +287,13 @@ static void
 nouveau_temp_probe_i2c(struct drm_device *dev)
 {
     struct i2c_board_info info[] = {
+#if 0
         { I2C_BOARD_INFO("w83l785ts", 0x2d) },
         { I2C_BOARD_INFO("w83781d", 0x2d) },
         { I2C_BOARD_INFO("adt7473", 0x2e) },
         { I2C_BOARD_INFO("f75375", 0x2e) },
         { I2C_BOARD_INFO("lm99", 0x4c) },
+#endif
         { }
     };

Re-adding any of the I2C_BOARD_INFO lines - I tried them 1 at a time - makes
the problem come back. The simple 1 byte address test i2c transfer is enough to
trigger the problem.

The above work around is enough to make my display work again for commit
486a45c2, but the problem comes back in a later commit when the i2c lines are
reset in the bit-bang adapter init code. I've had to add the following hack to
work around the problem again:

--- a/drivers/gpu/drm/nouveau/core/subdev/i2c/base.c
+++ b/drivers/gpu/drm/nouveau/core/subdev/i2c/base.c
@@ -327,9 +333,13 @@ nouveau_i2c_ctor(struct nouveau_object *parent, struct
nouveau_object *engine,
         i2c_set_adapdata(&port->adapter, i2c);

         if (port->adapter.algo != &nouveau_i2c_aux_algo) {
+            if(i==2) {
+            nv_warn(i2c, "I2C%d: type %d index %x/%x - supressing scl/sda
init\n", i, port->type, port->drive, port->sense);
+            } else {
             nouveau_i2c_drive_scl(port, 0);
             nouveau_i2c_drive_sda(port, 1);
             nouveau_i2c_drive_scl(port, 1);
+            }

So it appears that even this simple attempt to reset the i2c lines on bus 2 is
enough to destabilise the display.

Obviously, these 2 hacks will need to be replaced with something better, but
I've no idea what - perhaps a board specific i2c bus blacklist!

None of this makes any difference to the fade-to-back problem introduced by
commit cb75d97e, but I can now get its parent commit 70790f4f working. In
summary, this is where I am:

70790f4f + 3bb076af + dpms-fix + i2c-2-hacks  -  works
cb75d97e + 3bb076af + dpms-fix + i2c-2-hacks  -  fades to black

Looking at the console output from these 2 tests, the only significant change
seems to be a change of the AGP GART aperture from a sensible 64 MiB to 3712
MiB, which doesn't look right. The GART seem to be initialised later than
before too.

Regards,
Chris.

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[Bug 56461] NV11 black screen & kernel hang on loading nouveaufb

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=56461

--- Comment #42 from Chris Paulson-Ellis <chris-Tc38MJj1weLQT0dZR+AlfA@public.gmane.org> ---
I found the bug in commit cb75d97e that results in the incorrect GART aperture
and fixed it with this patch:

--- a/drivers/gpu/drm/nouveau/nouveau_compat.c
+++ b/drivers/gpu/drm/nouveau/nouveau_compat.c
@@ -17,7 +17,7 @@ nvdrm_gart_init(struct drm_device *dev, u64 *base, u64 *size)
     struct nouveau_drm *drm = nouveau_newpriv(dev);
     if (drm->agp.stat == ENABLED) {
         *base = drm->agp.base;
-        *size = drm->agp.base;
+        *size = drm->agp.size;
         return 0;
     }
     return -ENODEV;

However, the display still fades to black. I now get an error that I didn't get
with the parent commit:

PFIFO_DMA_PUSHER - Ch 0 Get 0x04000000 Put 0x00001088 State 0xc0000000 (err:
MEM_FAULT) Push 0x00000000

This message appears at the end of enabling the LDVS output, so it's probably
related (I'll attach the console log).

I'm not sure how to debug further. I'm wondering in particular how to trace the
effect of various changes in commit cb75d97e, such as those made to
run_digital_op_script()? Perhaps I need to trace all register read/writes
during the devinit phase and compare to the parent commit? How would I do this?

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[Bug 56461] NV11 black screen & kernel hang on loading nouveaufb

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=56461

--- Comment #43 from Chris Paulson-Ellis <chris-Tc38MJj1weLQT0dZR+AlfA@public.gmane.org> ---
Created attachment 74152
  --> https://bugs.freedesktop.org/attachment.cgi?id=74152&action=edit
console output for fading to black cb75d97e + 3bb076af + 92441b22 + i2c hacks +
gart size fix

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[Bug 56461] NV11 black screen & kernel hang on loading nouveaufb

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https://bugs.freedesktop.org/show_bug.cgi?id=56461

--- Comment #44 from Marcin Slusarz <marcin.slusarz-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
You can use mmiotrace to trace all register reads and writes and then parse it 
with demmio (from envytools) to have names attached to registers.

http://nouveau.freedesktop.org/wiki/Development

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[Bug 56461] NV11 black screen & kernel hang on loading nouveaufb

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https://bugs.freedesktop.org/show_bug.cgi?id=56461

--- Comment #45 from Emil Velikov <emil.l.velikov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
Can you confirm if the commit fixes the issue ?

commit f6853faa85793bf23b46787e4039824d275453c2
Author: Francisco Jerez <currojerez-sGOZH3hwPm2sTnJN9+BGXg@public.gmane.org>
Date:   Tue Feb 26 02:33:12 2013 +0100

    drm/nouveau: Fix typo in init_idx_addr_latched().

    Fixes script-based modesetting on some LVDS panels.

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[Bug 56461] NV11 black screen & kernel hang on loading nouveaufb

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https://bugs.freedesktop.org/show_bug.cgi?id=56461

--- Comment #46 from Chris Paulson-Ellis <chris-Tc38MJj1weLQT0dZR+AlfA@public.gmane.org> ---
Hi.

Sorry for the delay, but good news... commit f6853faa does indeed fix the
problem. It works when cherry picked on top of the commits & patches described
before. I've also checked the HEAD of nouveau/master as of today (557f8126) and
it is working with no patches required.

Hooray! My brain was hurting trying to make sense of mmio traces (when I got
time to look at it at all).

OpenGL doesn't work at all, but this is not a surprise. My user space is
ancient and I'm not sure if it's ever worked anyway.

Once again, thanks to all involved for caring about my ancient hardware.

Regards,
Chris.

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[Bug 56461] NV11 black screen & kernel hang on loading nouveaufb

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https://bugs.freedesktop.org/show_bug.cgi?id=56461

Emil Velikov <emil.l.velikov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #47 from Emil Velikov <emil.l.velikov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
Glad to hear, that it's working :)

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