It appears this bug is fairly well known. Here's an article called "Fix
Brightness Control Not Working for Ubuntu 14.04 & Linux Mint 17" at
http://itsfoss.com/fix-brightness-ubuntu-1310/ . Unfortunately, the fix
listed is only for the Intel Video card.
For what its worth, the brightness control
** Attachment added: "Output from "ls -lR" for /sys/class and /sys/devices
(starting with /sys/class/backlight)."
https://bugs.launchpad.net/ubuntu/+source/fglrx-installer/+bug/1318314/+attachment/4180143/+files/backlight-ls.txt
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** Attachment added: "Output from "lspci"."
https://bugs.launchpad.net/ubuntu/+source/fglrx-installer/+bug/1318314/+attachment/4180142/+files/lspci.txt
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I have the same problem as well, but this is on a Thinkpad T510 (about 5
years old). This is with the Nvidia graphs card and the Nvidia 331.38
driver (the Noveau driver doesn't work -- it consistently core dumps
after suspend/resume).
** Attachment added: "Xorg.0.org (Xorg Server log file)"
Once this bug occurs, it is readily reproducible (or at least I think
this is a reproduction case).
On my system, once X server wedges I can login to the machine via ssh
and "kill -9" the X server process. A new process starts, and
immediately throws the same stack traceback.
So there's the pote
i ran into this problem as well on a Lenovo Thinkpad T510 with nVidia
NVS 3100M (rev a2) graphics.
I've run into this problem four or five times in the week that i've
owned the laptop. in this particular case the freeze occurred after the
screen saver locked the screen, and i entered my password.
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