[Bug 117931] Black screen after resume from hibernate on HP Pavilion dv7 with 2 AMD GPUs

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=117931

--- Comment #3 from Eugene A. Shatokhin <eugene.shatokhin at rosalab.ru> ---
Re-checked on Fedora 23 x64 with the mainline kernel 4.7-rc7, git rev
68093c43f352, with no additional patches.

Resume from hibernation is not fully working yet but the problem looks
different this time.

When I put the system to suspend-to-disk then try to resume it, the desktop
environment appears this time but does not respond to keyboard, mouse,
whatever.

The system log contains lots of meesages "radeon: The kernel rejected CS, see
dmesg for more information.". 

Xorg.0.log ends with the following:
[  1608.239] (WW) RADEON(0): radeon_dri2_flip_event_handler: Pageflip
completion event has impossible msc 78924 < target_msc 78925

I will attach the logs below.

Besides, after I have done suspend-to-ram and resumed the system (without prior
reboot after the problem happened), the desktop seemed to be  operational again
after a couple minutes.

Interestingly enough, lspci shows incomplete info for one of the GPUs this time
(was OK with the earlier kernels):
-------------------
01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc.
[AMD/ATI] Whistler [Radeon HD 6630M/6650M/6750M/7670M/7690M] [1002:6741] (rev
ff) (prog-if ff)
    !!! Unknown header type 7f
    Kernel driver in use: radeon
    Kernel modules: radeon
-------------------
May be it is not related to the problem, may be it is.

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