[Bug 39612] New: radeon blocks with new style fencing

[Bug 39612] New: radeon blocks with new style fencing

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=39612

           Summary: radeon blocks with new style fencing
           Product: Drivers
           Version: 2.5
    Kernel Version: >= 2.6.37
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
        AssignedTo: drivers_video-dri@kernel-bugs.osdl.org
        ReportedBy: linas_fi@ymail.com
                CC: alexdeucher@gmail.com
        Regression: Yes


I am using a Radeon HD 3600 in kernel 2.6.36 with xf86-video-ati (KMS). Since
2.6.37 when starting the X server the screen goes black and never shows the
desktop.

kernel 2.6.36
startx -> Screen goes black -> The wallpaper appears -> The DE loads

kernel >= 2.6.37
startx -> Screen goes black -> You can't switch virtual terminals -> REISUB ->
Downgrade kernel

Reproducible: Always

Bisecting shows that it started failing at
d0f8a854c340986359a3b0a97e380c71def7a440: drm/radeon/kms/r6xx+: use new style
fencing (v3)

http://git.kernel.org/?p=linux/kernel/git/stable/linux-2.6.37.y.git;a=commit;h=d0f8a854c340986359a3b0a97e380c71def7a440

Downstream bug https://bugs.archlinux.org/task/23422

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[Bug 39612] radeon blocks with new style fencing

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https://bugzilla.kernel.org/show_bug.cgi?id=39612





--- Comment #1 from Alex Deucher <alexdeucher@gmail.com>  2011-07-20 04:19:06 ---
Please attach your xorg log and dmesg output.  Does booting with radeon.no_wb=1
on the kernel command line in grub help?

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[Bug 39612] radeon blocks with new style fencing

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https://bugzilla.kernel.org/show_bug.cgi?id=39612





--- Comment #2 from Linas <linas_fi@ymail.com>  2011-08-01 22:29:21 ---
Created an attachment (id=67342)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=67342)
Xorg log

Sorry for the delay. I'm attaching the file.
The radeon.no_wb=1 workaround does indeed work. Much appreciated.
Instead of showing only the mouse pointer (if lucky), shows the full screen
again.

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[Bug 39612] radeon blocks with new style fencing

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https://bugzilla.kernel.org/show_bug.cgi?id=39612


Alan <alan@lxorguk.ukuu.org.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |NEEDINFO
                 CC|                            |alan@lxorguk.ukuu.org.uk




--- Comment #3 from Alan <alan@lxorguk.ukuu.org.uk>  2012-08-24 15:33:20 ---
Is this still needing workarounds or can I close it ?

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[Bug 39612] radeon blocks with new style fencing

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https://bugzilla.kernel.org/show_bug.cgi?id=39612





--- Comment #4 from Linas <linas_fi@ymail.com>  2012-10-21 19:31:38 ---
Created an attachment (id=84201)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=84201)
Xorg log mieq

Testing with 3.6.2, radeon.no_wb=1 is still needed, although it seems a bit
better.
You can get -with a little difficulty- to switch virtual terminals, so it is
possible to SIGINT the xserver. Interestingly, although the first startx leads
to a blank screen, a second startx runs the DE without being apparently
affected. ?!
Booting with radeon.no_wb=1 the DE shows directly the first time, as it should.

In one failed instance, the Xorg log showed errors of «[mi] EQ overflowing.»,
«[mi] EQ overflow continuing.  100 events have been dropped.», «[mi] EQ
overflow continuing.  200 events have been dropped.»... I am attaching this
log.

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[Bug 39612] radeon blocks with new style fencing

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https://bugzilla.kernel.org/show_bug.cgi?id=39612





--- Comment #5 from Linas <linas_fi@ymail.com>  2012-10-21 19:34:45 ---
Created an attachment (id=84211)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=84211)
Other Xorg log

Another failed Xorg log, this time without overflowing errors.

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[Bug 39612] radeon blocks with new style fencing

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https://bugzilla.kernel.org/show_bug.cgi?id=39612

Alan <alan@lxorguk.ukuu.org.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Kernel Version|>= 2.6.37                   |3.6.2

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[Bug 39612] radeon blocks with new style fencing

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--- Comment #6 from Michel Dänzer <michel@daenzer.net> ---
Is this still an issue with current kernels and userspace stack?

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[Bug 39612] radeon blocks with new style fencing

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https://bugzilla.kernel.org/show_bug.cgi?id=39612

--- Comment #7 from Linas <linas_fi@ymail.com> ---
I still have video problems, although causing a freeze at some random point*,
rather than a black screen after boot.


* Or you can make it deterministic by running something like
/usr/lib/xscreensaver/kumppa ;)

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[Bug 39612] radeon blocks with new style fencing

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--- Comment #8 from Michel Dänzer <michel@daenzer.net> ---
(In reply to Linas from comment #7)
> I still have video problems, although causing a freeze at some random
> point*, rather than a black screen after boot.

Are you sure it's still the same problem? Does no_wb=1 still work around it?

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