This does not apply to the Thinkpad T420, there is no ATI card in it.
There can be a Nvidia Optimus NVS 4200M.
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This does not apply to the Thinkpad T420, there is no ATI card in it.
There can be a Nvidia Optimus NVS 4200M.
I have the same problem (X freezes, but not the mouse) since upgrading to 9.04 and now still in 9.10...
Have a look in those two pages, it might help :...
Hi,
Have a look at this threads for general information:
HOWTO: change resolution/refresh rate in Xorg:
http://ubuntuforums.org/showthread.php?t=83973
HOWTO: Get Dual Monitor Display...
Thanks Nubbe,
using alsamixer to turn off the "Audigy Analog/Digital Ouput Jack" solved the problem for me too.
It is not enough to have the option unchecked in gnome-volume-control > Swiches.