[Regression in 3.10] Garbage displayed after resume on Acer Aspire S5

[Rafael J. Wysocki]

On Saturday, July 06, 2013 03:59:49 PM Rafael J. Wysocki wrote:
> Hi,
> 
> I've just started to play with a new Acer Aspire S5 test box and noticed that
> garbage is displayed after resume from suspend to RAM with the 3.10 kernel
> (under KDE 4.10.3 on openSUSE 12.3).  The display corruption goes away after
> killing X and restarting it.
> 
> The CPU is a Core i5-3317U (Ivy Bridge), i915 graphics.
> 
> That doesn't happen with 3.9 (same config otherwise).  It also doesn't happen
> with my older Sandy Bridge-based box (with 3.10), so I suspect Ivy Bridge
> specifics.
> 
> Is this known?  Do you want me to bisect?

Most likely, this has been introduced by this commit:

commit 19b2dbde5732170a03bd82cc8bd442cf88d856f7
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Wed Jun 12 10:15:12 2013 +0100

    drm/i915: Restore fences after resume and GPU resets

At least I'm not able to reproduce it with that commit reverted.  With that
commit in I was able to reproduce it quite readily on machines with Ivy Bridge
and Sandy Bridge processors.

Thanks,
Rafael


-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.