For what it's worth I have the same symptoms on a Dell Inspiron 6000 series laptop. It's got an ATI x300 Radeon Mobility, so it's as far as I can tell not limited to Intel graphics. It uses the open-source ATI driver (since when I ask it to look for proprietary drivers it says none is available).
With desktop effects enabled X freezes after about 2-3 minutes. It freezes after about 1 minute if I use it, 2-3 if I just let it idle. Turn off desktop effects and everythings peachy.
For what it's worth I have the same symptoms on a Dell Inspiron 6000 series laptop. It's got an ATI x300 Radeon Mobility, so it's as far as I can tell not limited to Intel graphics. It uses the open-source ATI driver (since when I ask it to look for proprietary drivers it says none is available).
With desktop effects enabled X freezes after about 2-3 minutes. It freezes after about 1 minute if I use it, 2-3 if I just let it idle. Turn off desktop effects and everythings peachy.