In my previous post I wrote about BIOS problems with Fedora 12 and the Intel DP35DP motherboard. Sadly the problems didn’t stop there, I also had display problems with Fedora 12 Beta.
My desktop computer has an ATI Radeon HD 3450 video card, which apparently has an RV620 chip. Fedora 12 has kernel modesetting (KMS) support for Radeon R600/R700 chips and the Plymouth boot looked quite nice. After using the system for about a minute, the display went to power saving mode, just like that, on it’s own. I rebooted a couple of times with the same results, the system was pretty much unusable. I disabled KMS by adding the nomodeset parameter to the kernel line in /etc/grub.conf and now the system works like pretty much perfectly, apart from the missing graphical boot experience, of course . It seems R600/R700 KMS is still a bit buggy, but hey, this is a Beta version anyway.
Edit: I can also get the system to work with the pcie_asm=off kernel parameter. This might be the same situation as in the bug 517625.