Just want to share my expirience about this problem.

I also met the same issue in Kubuntu. After installing fglrx the
"bright-display" issue is fixed, however a new issues are introduced by
fglrx. The whole UI is much slower with fglrx. Just as an example, when
I click "Exit-Shutdown" the shutdown confirmation window appears after
5-6 seconds and xorg process is eating 100% of CPU. If my visual effects
are enabled, and windows are transparent moving any window becomes a
hell slow.

In fact, Kubuntu on virtual machine at my work place in vmware is
running faster than the Kubuntu at home. And at home I have Core 2 Quad
2.5 Ghz with 4 Gb of RAM ...

-- 
[R423] gamma bug, display too bright when using DVI-VGA adapter [patch]
https://bugs.launchpad.net/bugs/548709
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