Bug#863257: gdm3: stretch - login box displayed off-screen

Michael Biebl biebl at debian.org
Sat May 27 15:50:56 UTC 2017

Control: tags -1 + confirmed

Hi Ross

Am 24.05.2017 um 15:11 schrieb Ross Vandegrift:
> Package: gdm3
> Version: 3.22.3-2
> Severity: normal
> Hello,
> After upgrading to stretch, I cannot see gdm3's login box, only the
> background.  If I press enter and type my password, I'm logged in correctly.
> So I think the login box is being displayed off-screen.
> My system is a ThinkPad T450 in a dock.  The lid is closed, and two external
> monitors are attached.  Under jessie, gdm3 displayed the login box on one of
> the external displays.

Looks like I can reproduce the issue. I do have an X220 with a docking
station and external display. If I start the system with the lid closed,
the internal display is apparently not deactivated.

I remember that this worked in the past, and I suspect an issue related
to a kernel update:

> Kernel: Linux 4.9.0-3-amd64 (SMP w/4 CPU cores)

I could reproduce the problem with
linux-image-4.9.0-3-amd64  4.9.25-1

I then pulled 4.8.15-2 from

With that kernel, the internal display was correctly disabled when I
booted with the lid closed.

Can you confirm this observation? Does 4.8 work properly?


Why is it that all of the instruments seeking intelligent life in the
universe are pointed away from Earth?

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