After upgrading to 13.10, the compiz process has started taking 30% or more of CPU resources. In addition unity is sluggish and steam games that worked fine under 13.04 have a very low frame rate and are unplayable. Any suggestions on how to resolve this issue.
Compiz – High CPU Usage on Thinkpad T420 in Ubuntu 13.10
13.10compizlenovo
Best Answer
After trying many compiz config tweaks found under other answers, I looked at dmesg and found the following:
Looking at Lenovo's site: Lenovo support for T420 There was a bios upgrade available for my machine released on the 17th of July, 2013. After running this update, the video works as in 13.04.