Bug#956121: Blank screen on 2nd display using wayland

[Pierre Cheynier]

Le ven. 10 avr. 2020 à 14:42, Simon McVittie <smcv at debian.org> a écrit :
>
> 3.36.x should be in unstable, or even in testing, by then. You might
> want to put your working 3.34.3 setup on "hold" in apt/aptitude for now.
>

Seeing that you released to unstable 2 days ago, but doing an apt-get
update doesn't change anything for me.
Should I conclude that my mirror is late? (seeing the package when
browing it though...
http://ftp.fr.debian.org/debian/pool/main/m/mutter/)
```
$ date
dimanche 12 avril 2020, 15:28:36 (UTC+0200)
$ sudo apt-get update | grep sid
Atteint :4 http://ftp.fr.debian.org/debian sid InRelease
$ apt-cache policy mutter
mutter:
  Installé : 3.34.3-1
  Candidat : 3.34.4-1
 Table de version :
     3.34.4-1 500
        500 http://ftp.fr.debian.org/debian bullseye/main amd64 Packages
          2 http://ftp.fr.debian.org/debian sid/main amd64 Packages
 *** 3.34.3-1 100
        100 /var/lib/dpkg/status
```

> > > You appear to have a dual-GPU system. Is the NVIDIA device completely
> > > disabled, or are they both active via some sort of dual-GPU arrangement
> > > like Bumblebee?
>
> You didn't answer this. If the NVIDIA device is disabled, how did you
> disable it?

Yes, actually I just didn't do any bumblebee setup of whatever related
to nvidia drivers, but you're right that it doesn't mean my chip is
disabled.
Unfortunately, I just figured out that I cannot disable the chip since
the wiring is the following:
```
$ sudo ls -l /sys/class/drm/card*
lrwxrwxrwx 1 root root 0 avril 12 15:12 /sys/class/drm/card0 ->
../../devices/pci0000:00/0000:00:02.0/drm/card0
lrwxrwxrwx 1 root root 0 avril 12 15:12 /sys/class/drm/card0-LVDS-1 ->
../../devices/pci0000:00/0000:00:02.0/drm/card0/card0-LVDS-1
lrwxrwxrwx 1 root root 0 avril 12 15:12 /sys/class/drm/card0-VGA-1 ->
../../devices/pci0000:00/0000:00:02.0/drm/card0/card0-VGA-1
lrwxrwxrwx 1 root root 0 avril 12 15:12 /sys/class/drm/card1 ->
../../devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card1
lrwxrwxrwx 1 root root 0 avril 12 15:12 /sys/class/drm/card1-DP-1 ->
../../devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card1/card1-DP-1
lrwxrwxrwx 1 root root 0 avril 12 15:12 /sys/class/drm/card1-DP-2 ->
../../devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card1/card1-DP-2
lrwxrwxrwx 1 root root 0 avril 12 15:12 /sys/class/drm/card1-DP-3 ->
../../devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card1/card1-DP-3
```
So in my case, LVDS-1 and DP-1 connected.

> > Let me tell you that it's a mess if we consider all graphics +
> > gnome-shell + plugins related logs :)
>
> Yes it is, but it might be helpful to show us anyway.

Just did an apt-get upgrade + gdm3 stop/start > bug > gdm3 stop +
dpkg-i <old_packages>.
You'll find in attachment the full journald logs (between the gdm3
start and stop), concretely if I clean the thing a bit (remove pids,
etc.) and do a diff, I see nothing obvious.. (I mean, there are a lot
of errors, but present in both cases).

>
> If you're using GNOME Shell extensions, please test with them all disabled
> and see whether that works (you can re-enable them afterwards).
>

Disabled everything, same behavior.

> If you run the lspci command (install pciutils if you don't already have
> it), what device is 00:1f.2?

OK, it seems unrelated (and older anyway).
```
$ lspci | grep 00:1f.2
00:1f.2 RAID bus controller: Intel Corporation 82801 Mobile SATA
Controller [RAID mode] (rev 04)
```
> Similarly, what device is 01:00.0? It's on its own separate PCIE bus if I
> understand correctly, which probably means it's either your Intel GPU or
> NVIDIA GPU.

True, the NVIDIA GPU.
```
$ lspci | grep 01:00.0
01:00.0 VGA compatible controller: NVIDIA Corporation GK107GLM [Quadro
K2000M] (rev a1)
```
>
> Searching for the log messages suggests that booting with
>     intel_iommu=igfx_off
> or
>     intel_iommu=off

Tried these, didn't change anything.
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