[Bug 112407] [i915] eDP cannot light up after waking up from suspend the second time.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=112407

--- Comment #3 from Yvonne <yvonnex.yang at intel.com> ---
(In reply to Lakshmi from comment #2)
> (In reply to Yvonne from comment #0)
> > 
> > Expected result:
> > After step3, eDP should light up after waking up from suspend.
> > 
> What have you done to make eDP working after step3?

eDP cannot light up, but remote can connect to system. Issue only can be
recovered via reboot. 

> Can you attach the full dmesg from boot with kernel parameters
> drm.debug=0x1e log_buf_len=4M.
> 
> Also, I would recommend to reproduce this issue using drm-tip
> (https://cgit.freedesktop.org/drm-tip)

I tried to reproduce issue with drm-tip (top commit is 20edef7), but with the
kconfig I attached, it seems suspend cannot work. System will hang if do
suspend via "sudo rtcwake -m mem -s 10" 

Besides, I tried to reproduce this issue on CML RVP with codec ALC700 in SDW
mode with
linux-image-unsigned-5.4.0-050400-generic_5.4.0-050400.201911242031_amd64.deb,
issue can still be reproduced. Full dmesg with kernel parameters drm.debug=0x1e
log_buf_len=4M please see the attachment.

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