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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A working solution is described here - I hope it helps you as much as it helped me! – Torben Gundtofte-Bruun Jun 23 '15 at 21:31
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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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http://download.lenovo.com/ibmdl/pub/pc/pccbbs/mobiles/83uj28us.iso is a bootable CD. – Jeffery Williams Dec 13 '13 at 00:23
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I get the same message
Wrong MCH_SSKPD value: 0x16040307on my X220, but even after the update the latest1.39BIOS it does not go away (Ubuntu 13.10). – nh2 Dec 15 '13 at 13:00