Bug#804110: xserver-xorg-video-nouveau: fresh install debian-8.2.0-amd64, Xfce yields black screen at login

[Sven Joachim <svenjoac@gmx.de>]

On 2015-11-13 00:35 +0100, David Christensen wrote:

> On 11/12/2015 02:05 PM, Sven Joachim wrote:
>> Please press 'e' rather than 'c' in the grub
>> menu and edit the line starting with "linux".
>
> Okay:
>
> 	linux	/vmlinuz-3.16.0-4-amd64 root=/dev/mapper/sda3_crypt\
>  ro  quiet systemd.unit=multi-user.target
>
>
> Then press Ctrl+x to boot.  I arrive at a text console.  Login as root:
>
>     root@i72720qm:~# lsmod | grep ^nouveau
>     nouveau              1122419  1
>
>
> So, it appears that the nouveau kernel module is loaded.

This is nice, but not consistent with the result in your original
report.  Can you please send the complete dmesg output?

> Login as unprivileged user.  Start X Windows:
>
>     toor@i72720qm:~$ startx
>
>
> I arrive at the Xfce desktop.
>
>
> When I log out, I arrive back at the text console where I left off.
>
>
> So, now I have a work-around (that reminds me of ~10 years ago).
>
>
> I would still like to get the graphical login manager working.

Probably something like this would work (see modules-load.d(5)):

# echo nouveau > /etc/modules-load.d/nouveau.conf

This would hopefully load the nouveau kernel module early enough.
However, I still don't understand why this apparently isn't done by
udev.

Cheers,
       Sven