Comment 25 for bug 537640

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Kim Chee Leong (kc-leong) wrote : Re: [RV530] video problem flicker unreadable hp compaq nx9420 ati radeon [Needs pll quirk]

The radeon.new_pll=0 kernel line works on my ATI X1600 (HP nc8430 laptop). The 3d and desktop effects are not working with this trick.

Strange thing is: If I use my TFT monitor as a second screen in a dual head setup and
don't use the kernel line, the laptop screen is ok. TFT monitor is not ok, shows horizontal scrolling. So I disabled my second screen, and now the laptop screen is ok (with 3d effects/compiz).