I think this patch[1] might potentially fix it. I'd love to give it a try since I suffer this issue in many different situations (normal startup, attaching external monitors, random flickers...).
BR [1] https://bugs.freedesktop.org/show_bug.cgi?id=105267 O Mér, 10-10-2018 ás 13:01 +0100, Simon McVittie escribiu: > Control: retitle 909770 i915: Does not show gdm greeter on eDP: Link > Training failed at link rate = 270000, lane count = 2 > Control: severity 909770 important > Control: reassign 909770 src:linux > Control: affects 909770 gdm3 > > On Wed, 10 Oct 2018 at 13:22:37 +0200, Sergio Villar Senin wrote: > > Note that I've reproduced today this very same issue with lightdm > > as > > well, so I guess this is the confirmation that the bug is somewhere > > else. Graphics drivers maybe? > > Yes, this sounds like a graphics driver problem. Summarizing for > kernel/graphics maintainers: > > Original bug report: > > > Boot the computer, then wait for the login screen (gdm) to appear. > > > > The background of the plyumouth theme is shown but the list of > > users is not there as expected. > > > > Sometimes I press the power button and the system suspends to > > RAM. When resuming then the gdm login screen is there, *but* if I > > try to > > enter any session (GNOME) it does not work. The authentication > > seems > > to succeed but then the screen becomes blank and there is no > > possibility to even switch to the terminals via Ctr-Alt-Fx. > > Logs: https://pastebin.com/PiwQdiR2 and > https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=909770#17 > > Most relevant-looking log message: > > > laptop kernel: [drm:intel_dp_start_link_train [i915]] *ERROR* > > [CONNECTOR:71:eDP-1] Link Training failed at link rate = 270000, > > lane > > count = 2 > > Workaround (presumably suspend/resume retries link training): > > > BTW I noticed that it is possible to enter the session by following > > the > > next steps: > > 1- Boot > > 2- Nothing is shown. Press power button to suspend > > 3- Resume laptop. gdm is shown > > 4- Enter credentials. Succeeds. > > 5- Nothing is shown. Press power button to suspend > > 6- Resume laptop. GNOME session is opened and working normally > > Disabling Wayland in gdm does not work around this. Switching to > lightdm > works around this (presumably it chooses video modes in a way that > does > not exactly match GNOME?), but not entirely reliably. > > smcv >