Created attachment 92611 [details] dmesg log showing KMS failing This is an intermittent bug that I thought had disappeared, but is back with the 3.7.x kernel series. Basically, the KMS framebuffer sometimes fails to appear when the radeon.ko module is loaded from the initramfs. I have attached two dmesg logs, one showing the problem and the other showing a normal boot. The only workaround that I have found is to reboot the PC and hope that it works next time. This particular machine has a HD4670 AGP card, but I've also a much more recent one with a PCIe v2 HD6450 that has started doing this too. /proc/cmdline: BOOT_IMAGE=/vmlinuz-3.7.6 root=UUID=36d22042-83b5-4ae7-a8b3-11462b2d0e4c ro rd.md=0 rd.lvm=0 rd.dm=0 elevator=cfq console=ttyS0,115200n8 console=tty0 acpi_pm_good vconsole.font=latarcyrheb-sun16 vconsole.keymap=uk rd.luks=0 LANG=en_GB.UTF-8 irqpoll=1
Created attachment 92621 [details] dmesg log showing KMS working correctly
The failing log show GPU resets, so I suspect some combination of userspace drivers is causing the GPU to hang. Is this still an issue with a newer kernel or userspace stack?
This particular intermittent problem hasn't occurred again, but I can't claim to know whether it has been fixed.
It's more likely due to ongoing development in the userspace drivers than the kernel.