Hm, I think that might be missing hint. I have a ssh server running to
log in that way (using the nomodeset and the vt could be installed in
the broken state). And I stumbled into the working state again.
Comparing the xorg.log files I found that when things work, the cirrus
module seems to have finished loading and prevents the cirrus x-driver
from getting active:
[ 11.447] (EE) cirrus: The PCI device 0xb8 at 00@00:02:0 has a kernel module
claiming it.
[ 11.447] (EE) cirrus: This driver cannot operate until it has been unloaded.
...
[ 11.448] (II) modesetting(0): Creating default Display subsection in Screen
section
"Default Screen Section" for depth/fbbpp 24/24
[ 11.448] (==) modesetting(0): Depth 24, (==) framebuffer bpp 24
However in the case where lightdm works but switching to a text console
does not, there was a problem with drm device:
[ 12.015] (EE) open /dev/dri/card0: No such file or directory
[ 12.016] (EE) open /dev/fb0: No such file or directory
...
[ 12.018] (II) CIRRUS(0): initializing int10
[ 12.020] (II) CIRRUS(0): Primary V_BIOS segment is: 0xc000
[ 12.020] (II) CIRRUS(0): Creating default Display subsection in Screen
section
"Default Screen Section" for depth/fbbpp 24/24
[ 12.020] (--) CIRRUS(0): Depth 24, (==) framebuffer bpp 24
Looking at the syslog for cirrus, the current (good) run has
Sep 5 12:05:28 ubuntu-virtual-machine kernel: [ 8.609150] fb: conflicting
fb hw usage cirrusdrmfb vs EFI VGA - removing generic driver
Sep 5 12:05:28 ubuntu-virtual-machine kernel: [ 8.667602] fbcon:
cirrusdrmfb (fb0) is primary device
Sep 5 12:05:28 ubuntu-virtual-machine kernel: [ 8.674590] fb0: cirrusdrmfb
frame buffer device
Sep 5 12:05:28 ubuntu-virtual-machine kernel: [ 8.674599] [drm] Initialized
cirrus 1.0.0 20110418 for 0000:00:02.0 on minor 0
but the previous (bad) one had this:
Sep 5 11:57:51 ubuntu-virtual-machine kernel: [ 9.838015] fb: conflicting
fb hw usage cirrusdrmfb vs EFI VGA - removing generic driver
Sep 5 11:57:51 ubuntu-virtual-machine kernel: [ 9.865736]
[drm:cirrus_vram_init] *ERROR* can't reserve VRAM
Sep 5 11:57:51 ubuntu-virtual-machine kernel: [ 9.865757] cirrus
0000:00:02.0: Fatal error during GPU init: -6
Now need to find out why this fails sometimes.
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https://bugs.launchpad.net/bugs/1038055
Title:
graphics fail to initialise correctly, in kvm with cirrus graphics
(after LUKS install)
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