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Bug#655183: libdrm: screen sometimes remains off after suspend/resume

found 655183 2.6.39-3
found 655183 3.1.8-1
found 655183 3.2~rc7-1~experimental.1

On 2012-01-09 20:19:19 +0100, Julien Cristau wrote:
> On Mon, Jan  9, 2012 at 03:52:43 +0100, Vincent Lefevre wrote:
> > Source: libdrm
> > Version: 2.4.30-1
> > Severity: normal
> > 
> > [Not sure about the package, but error messages suggest a problem
> > with drm, as seen below.]
> > 
> That means kernel, not libdrm.  I'm guessing 3.1.6 based on the date in
> your X log, but...

Yes, however I had also tried with 2.6.39-3 (because I didn't have
such a problem in the past, IIRC). But I got the same problem with

I've now found a way to reproduce it. When I type Fn-F8, the machine
almost completely freezes: the mouse pointer no longer moves, I can
no longer connect to the machine by SSH, and I can no longer control
the screen brightness; however I can still control the keyboard
backlight. Once this is done, after the following reboots, the
suspend/resume bug systematically appears, until I type
"xrandr --output LVDS-1 --auto", in which case, the bug no longer
appears (until I type Fn-F8).

> Please try 3.2,

I can reproduce the bug with:
  * linux-image-3.1.0-1-amd64 3.1.8-1
  * linux-image-3.2.0-rc7-amd64 3.2~rc7-1~experimental.1

Also, I don't know whether this matters, but in the syslog messages,
I can see:

Jan 10 01:57:08 xvii kernel: [    0.171552] [Firmware Bug]: ACPI: BIOS _OSI(Linux) query ignored
Jan 10 01:57:08 xvii kernel: [   13.152045] [Firmware Bug]: Duplicate ACPI video bus devices for the same VGA controller, please try module parameter "video.allow_duplicates=1"if the current driver doesn't work.

> and if the issue is still reproducible report upstream
> at bugs.freedesktop.org with a drm.debug=6 dmesg.

OK, I'm going to do that.

Vincent Lefèvre <vincent@vinc17.net> - Web: <http://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <http://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)

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