[Bug 86697] [BSW] System fail to enter S4 at the second cycle to execute "echo disk > /sys/power/state" command

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=86697

wendy.wang at intel.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |ASSIGNED

--- Comment #8 from wendy.wang at intel.com ---
Hello Ville,

Test on BSW FAB2 B1 CPU with V40 BIOS.
KSC is 1.05
Kernel tag: drm-intel-testing 2014-11-21

Reproduce scenario 1:
1. Boot up system and xinit &
2. Put system enter into S4 with command :"echo disk > /sys/power/state"
3. Resume system back with pressing power button
4. Check /sys/kernel/debug/dri/0/i915_error_state reg, there is no error
5. Pkill x and restart X,  will have GPU hang error: pls see attached
gpuhang_after_s4-after_xinit.log

Reproduce scenario 2:
1. Boot up system and Put system enter into S4 with command :"echo disk >
/sys/power/state"
2. Resume system back with pressing power button
3. There is no GPU hang error in /sys/kernel/debug/dri/0/i915_error_state reg
4. Second time to execute "echo disk > /sys/power/state", GPU will hang, pls
refer to attached i915_error_state_2nd_S4_execute.log

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