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[Christian Zigotzky <1434036@xxxxxxxxxxxxxxxxxx>]

I installed the display manager "slim". It started and I could login.
But I have the same errors with the MATE desktop like on QEMU. Some
colors are wrong on the ubuntu MATE desktop. I can't use the mate-panel.
If I click on the panel (menu, icons etc) then nothing happens. The mate
panel and the mate taskbar starts again and again. And there is a blank
error message in the middle of the desktop. I installed lightdm again
and I downgraded the Xorg packages again. Everything works without any
problems again.

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https://bugs.launchpad.net/bugs/1434036

Title:
  ubuntu MATE 15.04 PPC/Lubuntu 15.04 PPC Xorg: Only black screen with
  blink cursor after update

Status in lightdm-gtk-greeter package in Ubuntu:
  New
Status in xorg-server package in Ubuntu:
  Confirmed
Status in xserver-xorg-video-ati package in Ubuntu:
  Confirmed
Status in xserver-xorg-video-fbdev package in Ubuntu:
  Confirmed

Bug description:
  Hi All,

  We updated ubuntu MATE 15.04 and Lubuntu 15.04 on our PowerPC
  computers (Power Mac G5 Quad and AMIGA one X1000) last week. Synaptic
  told us that it want to remove xserver-xorg-video-radeon and xserver-
  xorg-video-ati. But there are new versions available (xserver-xorg-
  video-radeon 1:7.5.0-1ubuntu2 and xserver-xorg-video-ati
  1:7.5.0-1ubuntu2). Synaptic removed both old packages and Xorg didn't
  work after that. I selected both new packages and updated them
  manually. After a restart I had a black screen with a blink cursor.
  There aren't any error messages in the log file '/var/log/Xorg.0.log'
  but I found some error messages in the log file '/var/log/syslog':

      . Exiting.
      Mar 19 11:45:41 ubuntu systemd[1]: lightdm.service: main process exited, code=exited, status=1/FAILURE
      Mar 19 11:45:41 ubuntu systemd[1]: Unit lightdm.service entered failed state.
      Mar 19 11:45:41 ubuntu systemd[1]: lightdm.service failed.
      Mar 19 11:45:41 ubuntu systemd[1]: lightdm.service holdoff time over, scheduling restart.
      Mar 19 11:45:41 ubuntu systemd[1]: Starting Light Display Manager...
      Mar 19 11:45:41 ubuntu systemd[1]: Started Light Display Manager.
      Mar 19 11:45:41 ubuntu lightdm[20218]: initctl: Verbindung zu Upstart nicht möglich: Failed to connect to socket /com/ubuntu/upstart: Verbindungsaufbau abgelehnt
      Mar 19 11:45:42 ubuntu systemd[1]: Started Session c109 of user lightdm.
      Mar 19 11:45:42 ubuntu systemd[1]: Starting Session c109 of user lightdm.
      Mar 19 11:45:42 ubuntu lightdm[20218]: ** (lightdm:20218): WARNING **: Error using VT_WAITACTIVE 7 on /dev/console: No such device or address
      Mar 19 11:45:43 ubuntu kernel: lightdm-gtk-gre[20251]: unhandled signal 11 at 00000000 nip 6f4e61c4 lr 6f4e619c code 30001
      Mar 19 11:45:44 ubuntu org.gtk.vfs.Daemon[20250]: A connection to the bus can't be made
      Mar 19 11:45:44 ubuntu org.gtk.vfs.Daemon[20250]: g_dbus_connection_real_closed: Remote peer vanished with error: Underlying GIOStream returned 0 bytes on an async read (g-io-error-quark, 0). Exiting.
      Mar 19 11:45:44 ubuntu systemd[1]: lightdm.service: main process exited, code=exited, status=1/FAILURE
      Mar 19 11:45:44 ubuntu systemd[1]: Unit lightdm.service entered failed state.
      Mar 19 11:45:44 ubuntu systemd[1]: lightdm.service failed.
      Mar 19 11:45:44 ubuntu systemd[1]: lightdm.service holdoff time over, scheduling restart.
      Mar 19 11:45:44 ubuntu systemd[1]: Starting Light Display Manager...
      Mar 19 11:45:44 ubuntu systemd[1]: Started Light Display Manager.
      Mar 19 11:45:44 ubuntu lightdm[20381]: initctl: Verbindung zu Upstart nicht möglich: Failed to connect to socket /com/ubuntu/upstart: Verbindungsaufbau abgelehnt
      Mar 19 11:45:45 ubuntu systemd[1]: Started Session c110 of user lightdm.
      Mar 19 11:45:45 ubuntu systemd[1]: Starting Session c110 of user lightdm.
      Mar 19 11:45:45 ubuntu lightdm[20381]: ** (lightdm:20381): WARNING **: Error using VT_WAITACTIVE 7 on /dev/console: No such device or address
      Mar 19 11:45:46 ubuntu kernel: lightdm-gtk-gre[20414]: unhandled signal 11 at 00000000 nip 6f4e61c4 lr 6f4e619c code 30001
      Mar 19 11:45:46 ubuntu org.gtk.vfs.Daemon[20413]: A connection to the bus can't be made
      Mar 19 11:45:46 ubuntu org.gtk.vfs.Daemon[20413]: g_dbus_connection_real_closed: Remote peer vanished with error: Underlying GIOStream returned 0 bytes on an async read (g-io-error-quark, 0)

  ------------------------------------------------------------------------------

  I installed Upstart again but unfortunately it didn't solve the
  problem with the black screen and the blink cursor.

  The temporary solution is to downgrade Xorg:

  sudo dpkg -i xserver-xorg-core_1.16.0-1ubuntu1.3_powerpc.deb
  sudo dpkg -i xserver-xorg-video-radeon_7.4.0-2ubuntu2_powerpc.deb
  sudo dpkg -i xserver-xorg-video-ati_7.4.0-2ubuntu2_powerpc.deb

  I created a package with all debs and Mesa libs for the downgrade last
  week.

  Download:
  http://www.xenosoft.de/Xorg_and_unofficial_Mesa_for_ubuntu_MATE_15.04_AMIGA_one_X1000.tar.gz

  Further information: http://ubuntuforums.org/showthread.php?t=2264322

  PLEASE help us.

  Thanks in advance.

  Cheers,

  Christian

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