Bug#909770: gdm3: Does not show the list of users and fails to start any session

[Sergio Villar Senin]

O Xov, 27-09-2018 ás 22:39 +0100, Simon McVittie escribiu:
> Control: tags -1 + moreinfo
> 
> On Thu, 27 Sep 2018 at 23:16:05 +0200, Sergio Villar Senin wrote:
> >    The background of the plyumouth theme is shown but the list of
> >    users is not there as expected.
> 
> When this happens, what messages appear in the system log (systemd
> journal or syslog)?
> 
> > 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.
> 
> When this happens, what messages appear in the system log (systemd
> journal or syslog)?

This is the boot log https://pastebin.com/PiwQdiR2

I don't see anything specially wrong there except these lines:

laptop kernel: [drm:intel_dp_start_link_train [i915]] *ERROR*
[CONNECTOR:71:eDP-1] Link Training failed at link rate = 270000, lane
count = 2

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

That's why I think it's probably the same bug although I am no longer
sure it's a gdm3 issue, perhaps something related to the intel drivers.

BR