This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:
apport-collect 1386867
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This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.
** Changed in: linux (Ubuntu)
Status: New => Incomplete
** Tags added: utopic
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https://bugs.launchpad.net/bugs/1386867
Title:
radeon fence failure reduces screen resolution
Status in “linux” package in Ubuntu:
Incomplete
Bug description:
While using Kubuntu 14.10 sometimes the screen blacks out for a few
seconds and then comes back to life, but often with highly reduced
resolution. The resolution of the screen actually seems to be fine (as
evident by taking a screenshot) but things seem to get rendered on a
much too small buffer and then streched to fit the screen (terrible
upscaling?). Sorry I'm having a hard time explaining it, but see the
attached screenshot.
This actually happened multiple times. One time it logged me out of
KDE, another time KDE stayed active but the resolution was reduced (or
whatever this is)
Attached is the output of dmesg, the relevant error seems to start here:
[12105.193052] radeon 0000:01:00.0: ring 0 stalled for more than 10140msec
[12105.193058] radeon 0000:01:00.0: GPU lockup (waiting for
0x00000000000dec08 last fence id 0x00000000000dec03 on ring 0)
[12105.674184] radeon 0000:01:00.0: Saved 592 dwords of commands on ring 0.
[12105.674320] radeon 0000:01:00.0: GPU softreset: 0x0000006C
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