Tried the thing with
cat /etc/modprobe.d/radeon-kms.conf
options radeon modeset=0
which was proposed in older versions as workaround.
but it is not acceptable. Works only with low resolution and no evidence that
the bug goes away.
Had it again, however!
Kernel =
Linux atviedl2a149 3.8.0-31-generic #46-Ubuntu SMP Tue Sep 10 20:03:44 UTC 2013
x86_64 x86_64 x86_64 GNU/Linux
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https://bugs.launchpad.net/bugs/1100286
Title:
[drm:radeon_cs_ib_chunk] *ERROR* Failed to schedule IB !
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