Hi, I opened a bug ( https://gitlab.freedesktop.org/drm/intel/-/issues/1378 ) a few months back, but no one seems to have looked at it. I'm emailing here to hopefully get a suggestion on a path forward. tl;dr: when resuming from DPMS, link training channel equalization fails on the Dell 7200 Whiskey Lake tablet eDP display. There is a flash of the screen and then it goes black. This repeats probably until the display goes into DPMS again. The system is sluggish when this happens. i915 0000:00:02.0: [drm:intel_dp_start_link_train [i915]] Channel equalization failed 5 times i915 0000:00:02.0: [drm:intel_dp_start_link_train [i915]] [CONNECTOR:95:eDP-1] Link Training failed at link rate = 270000, lane count = 2 Right now I have a hack to just return success from intel_dp_link_training_channel_equalization() after the 5 failures and the display seems to be usable. The issue seems to be that while Lane 0 succeeds in link training, Lane 1 does not. The system boots up with a usable display and seems to keep working as long as it doesn't go into DPMS. And to repeat the previous paragraph, hacking in "success", even though Lane 1 hasn't succeeded, seems to give a working display after resuming from DPMS. More details are in the bug. Any thoughts or suggestions are greatly appreciated. Thanks, Jason _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
