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.
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After trying many compiz config tweaks found under other answers, I looked at dmesg and found the following:
[ 36.361815] [drm] Wrong MCH_SSKPD value: 0x16040307
[ 36.361818] [drm] This can cause pipe underruns and display issues.
[ 36.361819] [drm] Please upgrade your BIOS to fix this. –
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.
Jeffery Williams
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