ubuntu-x-swat team mailing list archive

[baqtor <sdm_cacto@xxxxxxxxxxx>]

I seem to have this problem as well, but the flickering is much heavier
and makes my external screen unreadable. I upgraded from karmic a month
ago. I have an ATI X1200 in a Dell 1521 Laptop, with an external 23" LG
lcd monitor (wich is the only display that shows flickering). If I use
radeon.modeset=0 the problem dissappears and I get much better
performance.

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[RV515] [LENOVO T60] external screen display shows "shivering", horizontal refresh offset
https://bugs.launchpad.net/bugs/541501
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which is the registrant for xserver-xorg-driver-ati.