[Bug 44851] New: resume to black screen

[Bug 44851] New: resume to black screen

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=44851

           Summary: resume to black screen
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.5.0-3
          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: energonic@gmail.com
        Regression: No


System: iMac 11,2 (mid2010) with AMD radeon 4670.
kernel 3.5.0-3 used on ubuntu 12.10. No swap partition.
Boot requires nomodeset on kernel command line, else black screen (even for
text-only boot. Radeon module disconnects wrong display port).

Resume after suspend shows black screen, but reboots using Ctl-Alt-Del, so has
resumed from suspend. Suspect kms invoked on resume and radeon disconnects
wrong display port.

Same behaviour on archlinux using kernel 3.4.4-1.

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[Bug 44851] resume to black screen

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https://bugzilla.kernel.org/show_bug.cgi?id=44851


Alex Deucher <alexdeucher@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |alexdeucher@gmail.com




--- Comment #1 from Alex Deucher <alexdeucher@gmail.com>  2012-07-16 12:52:46 ---
Please attach your xorg log and dmesg output.  What do you mean by wrong
display port?  Is this a hybrid laptop with multiple GPUs?

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[Bug 44851] resume to black screen

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https://bugzilla.kernel.org/show_bug.cgi?id=44851





--- Comment #2 from Peter <energonic@gmail.com>  2012-07-16 13:55:04 ---
Created an attachment (id=75481)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=75481)
X windows log

This log is from when the system is started using nomodeset and X video driver
is fbdev.

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[Bug 44851] resume to black screen

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--- Comment #3 from Peter <energonic@gmail.com>  2012-07-16 13:57:00 ---
Created an attachment (id=75491)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=75491)
dmesg

dmesg log from when kernel starts with nomodeset and X video driver is fbdev.

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[Bug 44851] resume to black screen

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--- Comment #4 from Peter <energonic@gmail.com>  2012-07-16 13:59:38 ---
Sorry if I've used the wrong terminology. This is a standard iMac.
When I used the AMD proprietary fglrx driver some time ago on ubuntu 11.04 it
showed two display screens detected. The main one is the iMac display and the
other is for the display port to attach an external monitor. Now I use the
radeon kernel driver at boot time and the xf86 fbdev module for X. 
If I do a text-only boot without telling the kernel 'nomodeset', I get a black
screen; but it has booted - I presume the other 'display port' (or 'connector'?
not my main screen) has been chosen for text output.
Assuming I boot with nomodeset then I can start X OK, provided I use the xf86
fbdev driver (the xf86 ati driver just gives me a black screen - but
rebootable, etc). Then I can suspend the system and it goes quiet.
If I then awaken it using a keypress, I can hear it starting up, but the screen
stays black. I can reboot from here with Ctl-Alt-Del. My assumption is that, on
resume, the system tries to run a modeset from the kernel module and decides to
turn off the main screen. I would like to avoid it doing that because
essentially I cannot use suspend/resume.

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[Bug 44851] resume to black screen

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--- Comment #5 from Peter <energonic@gmail.com>  2013-05-13 08:27:10 ---
Just upgraded my arch installation on iMac from kernel 3.8.13 to 3.9.2. 
Was working, still with the fbdev driver, but now cannot boot properly, either
by grub efi or by pure efi (image selected by rEFInd). Behaves as if the
'nomodeset' parameter is ignored; results in all terminal screens black (but
sounds as if it has booted).
An arch image running in virtualbox (on mac) has upgraded to 3.9.2 without
problem, but that does not need 'nomodeset'.

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[Bug 44851] resume to black screen

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--- Comment #6 from Alex Deucher <alexdeucher@gmail.com>  2013-05-13 14:29:03 ---
Does it work ok if you boot with bootcamp?  Also, you might try a 3.10 kernel
there were some fixes for EFI systems.

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[Bug 44851] resume to black screen

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--- Comment #7 from Alex Deucher <alexdeucher@gmail.com>  2013-05-13 14:30:15 ---
Can you attach your xorg log and dmesg output with the radeon driver (without
nomodeset)?

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[Bug 44851] resume to black screen

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--- Comment #8 from Peter <energonic@gmail.com>  2013-05-13 17:36:33 ---
Created an attachment (id=101291)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=101291)
Xorg.0.log file

Xorg.0.log obtained from attempt to boot my iMac by efi (directly from kernel
image, and without the 'nomodeset' parameter).

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[Bug 44851] resume to black screen

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--- Comment #9 from Peter <energonic@gmail.com>  2013-05-13 17:40:37 ---
Created an attachment (id=101301)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=101301)
dmesg.txt file

Booted system from arch boot CD. Mounted main mac disk partition for arch (that
doesn't boot since upgrade to kernel 3.9.2). chroot to that partition. Run
dmesg and pipe output to external disk.

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[Bug 44851] resume to black screen

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https://bugzilla.kernel.org/show_bug.cgi?id=44851





--- Comment #10 from Peter <energonic@gmail.com>  2013-05-13 17:44:56 ---
Created an attachment (id=101311)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=101311)
kdm.log file

File from arch partition on main mac disk. Seems to show problem with kdm_greet
after failing to find a dbus session (which might be a result of a graphics
problem earlier).

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[Bug 44851] resume to black screen

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--- Comment #11 from Peter <energonic@gmail.com>  2013-05-21 10:15:05 ---
Still on iMac, installed fedora 18 on partition previously used by Arch (would
boot using KMS into black vts). fedora using kernel 3.6. Behaved like Arch did
previously; had to use kernel option 'nomodeset' to get any vt screens and that
stopped radeon module from being loaded by X 
(Xorg.0.log had: '[KMS] drm report modesetting isn't supported' and
this was followed by 'No screens found')

Now upgraded fedora to use kernel 3.9.2 and, as with Arch, get black vts even
if 'nomodeset' on kernel boot line.

The current kernel 3.9.2 is of no use on my system; I have no way to boot it
and run vt screens. Others who might need nomodeset may also be affected.

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[Bug 44851] resume to black screen

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |alan@lxorguk.ukuu.org.uk
     Kernel Version|3.5.0-3                     |3.9

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