suspend regression on carrizo

tom.stdenis@xxxxxxx (Tom St Denis) · Thu, 4 Jan 2018 13:03:19 -0500

Hi all,

This commit:

[root at carrizo linux]# git bisect good 

a08268f89a805b1aaccaeb899673dbe975c10d95 is the first bad commit
commit a08268f89a805b1aaccaeb899673dbe975c10d95
Author: Alex Deucher <alexander.deucher at amd.com>
Date:   Tue Dec 12 15:20:22 2017 -0500

     drm/amdgpu: drop scratch regs save and restore from S3/S4 handling

     The expectation is that the base driver doesn't mess with these.
     Some components interact with these directly so let the components
     handle these directly.

     Reviewed-by: Harry Wentland <harry.wentland at amd.com>
     Acked-by: Christian KÃ¶nig <christian.koenig at amd.com>
     Signed-off-by: Alex Deucher <alexander.deucher at amd.com>

causes fairly cool visual noise upon resume.   No idea why.  It's near 
100% reproducible.

Tom