From Bugzilla Helper: User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.0.0) Gecko/20020606 Description of problem: When upgrading my RH7.3 kernel from 2.4.18-3 to 2.4.18-5, I lost direct rendering on my IBM Thinkpad A30 (Radeon Mobility). I traced the issue to kernel modules that did not load because they were not PRESENT in the kernel package. Version-Release number of selected component (if applicable): 2.4.18-5 How reproducible: Always Steps to Reproduce: /lib/modules# find . -name "radeon*" ./2.4.18-3/kernel/drivers/char/drm/radeon.o ./2.4.18-3/kernel/drivers/video/radeonfb.o ./2.4.18-5/kernel/drivers/video/radeonfb.o Actual Results: When booting 2.4.18-5, chromium game is painfully slow. Graphics are jerky and unplayable. When booting 2.4.18-3 (NO OTHER CHANGES), chromium game plays just fine. Additional info:
Ok I bet the following is the case: you installed the i386 kernel (instead of the i586, i686 or athlon one) the i386 kernel doesn't have DRM support, the i586, i686 or athlon kernels DO have DRM support.... is my assumption correct ?
That was the problem. I didn't realize I had installed the i386 kernel for one thing but I also didn't think it mattered. Why isn't DRM in i386? (I am by far NOT a video guru)
The DRM code internally uses CPU instructions that are not available on a 80386......