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

[David Christensen <dpchrist@holgerdanske.com>]

On 11/13/2015 10:26 AM, Sven Joachim wrote:
> I see two notable things here:
>
> - There is no sign of the i915 module being loaded, I guess the on-board
>    graphics is disabled in the BIOS/UEFI?

These are the only things I see in CMOS setup that seem to be related to 
graphics:

  Settings ->
    General ->
      System Information ->
        Processor Information ->
          shows nothing about graphics
        Device Information ->
          Video Controller       = NVIDIA N12P-NS2
          Video BIOS Version     = 75.19.6A.01.02
          Video Memory           = 512 MB
          Panel Type             = 15.6" FHD
          Native Resolution      = 1920 by 1080
    Video ->
      Optimus ->
        Enable Optimus           = disabled


> - The boot seems to stall for 27 seconds.  That is probably unrelated to
>    this bug, but if you want to find out why, systemd-analyze(1) is your
>    friend.

Let me try again, using a stopwatch:

    0:00 push power button
    0:07 POST displayed
    0:12 GRUB menu displayed
    0:17 GRUB runs
    0:23 LUKS prompt displayed
    1:00 LUKS passphrase entered
    1:08 login screen displayed
    2:00 login as toor
    2:02 desktop displayed

It looks repeatable:

[    4.966532]  sda: sda1 sda2 sda3
[    4.967006] sd 0:0:0:0: [sda] Attached SCSI disk
[    4.974416] sr0: scsi3-mmc drive: 24x/24x writer dvd-ram cd/rw 
xa/form2 cdda tray
[    4.974419] cdrom: Uniform CD-ROM driver Revision: 3.20
[    4.974609] sr 1:0:0:0: Attached scsi CD-ROM sr0
[    4.975611] sd 0:0:0:0: Attached scsi generic sg0 type 0
[    4.975702] sr 1:0:0:0: Attached scsi generic sg1 type 5
[    5.067157] device-mapper: uevent: version 1.0.3
[    5.067287] device-mapper: ioctl: 4.27.0-ioctl (2013-10-30) 
initialised: dm-devel@redhat.com
[   32.778218] random: nonblocking pool is initialized
[   34.848447] NET: Registered protocol family 38
[   35.074219] raid6: sse2x1    4711 MB/s
[   35.142138] raid6: sse2x2    7738 MB/s
[   35.210066] raid6: sse2x4   11132 MB/s
[   35.210067] raid6: using algorithm sse2x4 (11132 MB/s)
[   35.210068] raid6: using ssse3x2 recovery algorithm
[   35.210364] xor: automatically using best checksumming function:
[   35.250018]    avx       : 22887.000 MB/sec
[   35.252889] Btrfs loaded


Perhaps it is related to LUKS (?).


> I don't think I'll be able to solve the problem, but at least you
> have an easy workaround.

You solved the original problem -- the graphical login manager now 
works.  Thank you.


David