3.2.0-17.27 seems to fix rc6-related graphics problems also on my
machine:

  Lenovo X220
  Version: 8DET54WW (1.24 )
  00:02.0 VGA compatible controller [0300]: Intel Corporation 2nd Generation 
Core Processor Family Integrated Graphics Controller [8086:0126] (rev 09)

With previous kernel, 3.2.0-17.26, I had occasional graphic glitches.
Glitches appeared as unrefreshed screen areas (displaying content from
windows below the top one). Now they are all gone. Power levels have
remained at the same level (avg=6.67W, std=0.11) in idle mode.

Well done!

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https://bugs.launchpad.net/bugs/935965

Title:
  RC6 enabled causes severe graphics corruption

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