[Bug 57381] Radeon HD6950: Resuming from hibernation fails sometimes

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=57381


Lan Tianyu <tianyu.lan@intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|Hibernation/Suspend         |Video(DRI - non Intel)
         AssignedTo|tianyu.lan@intel.com        |drivers_video-dri@kernel-bu
                   |                            |gs.osdl.org
            Product|Power Management            |Drivers




--- Comment #18 from Lan Tianyu <tianyu.lan@intel.com>  2013-06-17 02:14:18 ---
Thanks for test. I think you have done a very good job.

(In reply to comment #16)
> Ok, the following statements deactivate async for the graphics card (+ its HDMI
> audio):
> echo disabled > "/sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/power/async"
> echo disabled > "/sys/devices/pci0000:00/0000:00:01.0/0000:01:00.1/power/async"
> 
> This seems to have a similar effect as "echo 0 > /sys/power/pm_async".
> 
This shows the issue is still related with Graphics driver. Disable pm_async is
just to make all the driver suspend callback to be executed serially.

So reassign this bug to Graphic category.


> With this, I ran a series of 30 hibernate/resume cycles. The 7th and the 29th
> attempts failed (the last one failed twice), with the usual symptoms. So it
> seems that disabling async for the graphics card indeed only alleviates the
> problem. I will perform the same tests with pm_async deactivated just to be
> sure.

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