http://bugzilla.novell.com/show_bug.cgi?id=598641 http://bugzilla.novell.com/show_bug.cgi?id=598641#c0 Summary: Regression in 2.6.34 which prevents KMS from working Classification: openSUSE Product: openSUSE 11.3 Version: Milestone 5 Platform: Other OS/Version: Other Status: NEW Severity: Normal Priority: P5 - None Component: Kernel AssignedTo: kernel-maintainers@forge.provo.novell.com ReportedBy: sndirsch@novell.com QAContact: qa@suse.de Found By: --- Blocker: --- Since Kernel 2.6.34 it's no longer possible to use KMS on my Clarkdale (8086:0042) machine. This means using the native video driver (=intel) is no longer possible. Kernel boot message: [ 2.083688] i915 0000:00:02.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16 [ 2.083692] i915 0000:00:02.0: setting latency timer to 64 [ 2.123069] mtrr: type mismatch for d0000000,10000000 old: write-back new: write-combining [ 2.123071] [drm] MTRR allocation failed. Graphics performance may suffer. [ 2.123118] alloc irq_desc for 28 on node -1 [ 2.123120] alloc kstat_irqs on node -1 [ 2.123126] i915 0000:00:02.0: irq 28 for MSI/MSI-X [ 2.123131] [drm] set up 31M of stolen space [ 2.123225] [drm:i915_gem_init_ringbuffer] *ERROR* Ring head not reset to zero ctl ffffffff head ffffffff tail ffffffff start ffffffff [ 2.123239] [drm:i915_gem_init_ringbuffer] *ERROR* Ring head forced to zero ctl ffffffff head ffffffff tail ffffffff start ffffffff [ 2.123249] [drm:i915_gem_init_ringbuffer] *ERROR* Ring initialization failed ctl ffffffff head ffffffff tail ffffffff start ffffffff [ 2.123253] [drm:i915_driver_load] *ERROR* failed to init modeset [ 2.141383] i915: probe of 0000:00:02.0 failed with error -5 I googled a bit and found the regression and a workaround. https://patchwork.kernel.org/patch/85630/ https://bugzilla.kernel.org/show_bug.cgi?id=15533 --- I added two patches to the bugzilla: http://bugzilla.kernel.org/attachment.cgi?id=25522 (possible fix) http://bugzilla.kernel.org/attachment.cgi?id=25523 (additional debug) If the first patch fixes it, we're all set. If it doesn't, I'd like the additional debug info from the second patch." Thanks! Bjorn --- Workaround for now is kernel boot option: 'pci=nocrs'. -- Configure bugmail: http://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.