I quite often get this problem with 12.04.
Intel(R) Core(TM) i7-3770S CPU
my Xorg.0.log says this when it does not work (see attachment for when
it does work):
[ 12.269] vesa: Ignoring device with a bound kernel driver
[ 12.269] (WW) Falling back to old probe method for vesa
[ 12.516] (WW) Falling back to old probe method for modesetting
[ 12.516] (II) modesetting(2): using default device
[ 12.516] (II) Loading sub module "fbdevhw"
[ 12.516] (II) LoadModule: "fbdevhw"
[ 12.516] (II) Loading /usr/lib/xorg/modules/libfbdevhw.so
[ 12.516] (II) Module fbdevhw: vendor="X.Org Foundation"
[ 12.516] compiled for 1.13.0, module version = 0.0.2
[ 12.516] ABI class: X.Org Video Driver, version 13.0
[ 12.516] (**) FBDEV(3): claimed PCI slot 0@0:2:0
[ 12.516] (II) FBDEV(3): using default device
[ 12.516] (EE) Screen 0 deleted because of no matching config section.
[ 12.516] (II) UnloadModule: "vesa"
[ 12.516] (EE) Screen 0 deleted because of no matching config section.
[ 12.516] (II) UnloadModule: "modesetting"
[ 12.516]
Fatal server error:
[ 12.516] Cannot run in framebuffer mode. Please specify busIDs for
all framebuffer devices
[ 12.516]
[ 12.516] (EE)
Please consult the The X.Org Foundation support
at http://wiki.x.org
for help.
[ 12.516] (EE) Please also check the log file at "/var/log/Xorg.0.log" for
additional information.
[ 12.516] (EE)
[ 12.518] Server terminated with error (1). Closing log file.
** Attachment added: "Xorg.0.log when it does work"
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1095203/+attachment/3591959/+files/Xorg.0.log
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Title:
low graphics mode
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