On Dell Latitude E4310 amd64 I have the same problem too
powersave=0 workaround does not work!
kernels 2.6.32.21 or 2.6.32 22 do not have the problem !
kernel 2.6.32.23, 2.6.32.24, 2.6.32.25 have the flicker problem !
so some update from 2.6.32 22 to 2.6.32.23 is probably buggy

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Dell inspiron screen flicker after upgrade to ubuntu 10.04 
https://bugs.launchpad.net/bugs/587935
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