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.