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[Stefan Bader <stefan.bader@xxxxxxxxxxxxx>]

Public bug reported:

Trusty Server (daily image 2014-01-15)
Kernel: 3.13.0-3.18-generic 64bit

Booting a VM which is set to use cirrus graphics there seems to (still)
be a problem with the framebuffers. The kernel has a special KMS module
which also has a framebuffer interface. During boot plymouth likely
keeps the fb open which the kernel tries to replace the generic FB with
the special one (and fails). Symptom is a system which seems to hang on
boot when looking at the graphical console.

[    7.140598] checking generic (fc000000 160000) vs hw (fc000000 2000000)
[    7.140603] fb: conflicting fb hw usage cirrusdrmfb vs simple - removing generic driver
[    7.140650] Console: switching to colour dummy device 80x25
[    7.144410] [drm:cirrus_vram_init] *ERROR* can't reserve VRAM
[    7.144422] cirrus 0000:00:02.0: Fatal error during GPU init: -6
[    7.144426] Trying to free nonexistent resource <00000000febf4000-00000000febf4fff>
[    7.144431] Trying to free nonexistent resource <00000000fc000000-00000000fc3fffff>
[    8.254229] systemd-udevd[302]: Failed to apply ACL on /dev/dri/card0: No such file or directory

** Affects: linux (Ubuntu)
     Importance: Medium
         Status: Confirmed


** Tags: trusty

** Changed in: linux (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1269401

Title:
  [Trusty] Switching framebuffers fails on VMs using cirrus

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  Trusty Server (daily image 2014-01-15)
  Kernel: 3.13.0-3.18-generic 64bit

  Booting a VM which is set to use cirrus graphics there seems to
  (still) be a problem with the framebuffers. The kernel has a special
  KMS module which also has a framebuffer interface. During boot
  plymouth likely keeps the fb open which the kernel tries to replace
  the generic FB with the special one (and fails). Symptom is a system
  which seems to hang on boot when looking at the graphical console.

  [    7.140598] checking generic (fc000000 160000) vs hw (fc000000 2000000)
  [    7.140603] fb: conflicting fb hw usage cirrusdrmfb vs simple - removing generic driver
  [    7.140650] Console: switching to colour dummy device 80x25
  [    7.144410] [drm:cirrus_vram_init] *ERROR* can't reserve VRAM
  [    7.144422] cirrus 0000:00:02.0: Fatal error during GPU init: -6
  [    7.144426] Trying to free nonexistent resource <00000000febf4000-00000000febf4fff>
  [    7.144431] Trying to free nonexistent resource <00000000fc000000-00000000fc3fffff>
  [    8.254229] systemd-udevd[302]: Failed to apply ACL on /dev/dri/card0: No such file or directory

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