[i915] eDP cannot light up after waking up from suspend the second time.
Submitted by Yvonne
Assigned to Intel GFX Bugs mailing list
Created attachment 146033
Platform: CML Laptop with ALC711+ ALC1308+ ALC715 in SDW mode
1.Do system reboot with HDMI/DP external port connected.
2.Enter suspend via "sudo rtcwake -m mem -s 10", and unplug HDMI/DP external port during suspend.
3.Enter suspend again after waking up from suspend in step2
After step3, eDP should light up after waking up from suspend.
After step3, eDP cannot light up after waking up from suspend.
Tested it with linux-image-unsigned-5.4.0-050400-generic_5.4.0-050400.201911242031_amd64.deb, issue can still be reproduced.
With HDA legacy driver, same symptom still exist.
Need to fix in graphics driver.
Attachment 146033, "dmesg log":