Description of problem: Since kernel upgrade machine freezes after Fedora progress bar before login. Found DMA issue. Workaround is kernel option iommu=soft. For a newbie this would be a show stopper for using this version Linux on this big iron. Version-Release number of selected component (if applicable): kernel.x86_64 2.6.32.9-67.fc12 How reproducible: 100% Steps to Reproduce: 1. Software Update to kernel 2.6.32.9-67.fc12, from 2.6.31.12-174.2.22.fc12, which was working. 2. Reboot. Actual results: Soon after initial Fedora progress bar goes to black screen, no login. ssh in from other machine shows dmesg keeps repeating DRHD: handling fault status reg 2 DMAR:[DMA Read] Request device [01:00.0] fault addr 215da0000 DMAR:[fault reason 01] Present bit in root entry is clear Expected results: Log in normally and use computer. Additional info: The akmod-nvidia.x86_64 195.36.08-1.fc12 that is installed works fine with kernel 2.6.31.12-174.2.22.fc12. Workaround is on relevant kernel line, i.e. for 2.6.32.9-67.fc12, to append iommu=soft
Closing NOTABUG. If you can reproduce without the broken nvidia module (i.e. if nouveau has similar problems), then please re-open.