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

[Michael Biebl]

Am 27.05.2017 um 17:50 schrieb Michael Biebl:
> 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
> http://snapshot.debian.org/package/linux/4.8.15-2/
> 
> 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?
> 


I've narrowed this down. It seems to be a regression introduced by
4.9.25-1, 4.9.18-1 still works fine for me.

Ben, were there any DRM related changes in 4.9.25 which seem like they
could be relevant?




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

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