Messages in this thread | | | Date | Sun, 21 Nov 2010 18:34:23 +0000 | From | Chris Vine <> | Subject | Re: kernel 2.6.37-rc2 breaks i915 graphics |
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On Sun, 21 Nov 2010 10:30:43 +0000 Chris Wilson <chris@chris-wilson.co.uk> wrote:
> On Sun, 21 Nov 2010 10:23:44 +0000, Chris Vine > <chris@cvine.freeserve.co.uk> wrote: > > Hi, > > > > With kernel 2.6.37-rc2, i915 graphics usually fails on boot-up after > > modesetting with my Lenovo S12 netbook which uses the Intel 945GME > > Express Integrated Graphics Controller. It displays up to the > > point at which modesetting takes place and then usually goes blank. > > > > There may be some kind of race at work here: first, sometimes > > (maybe 1 times in 4) graphics comes up correctly on a first cold > > boot, but I have never managed to get it to come up on a warm > > reboot. Secondly, graphics can be restored when I know (but cannot > > see) that boot-up has concluded, simply by suspending the laptop > > and then resuming. Resuming the laptop after a suspend always > > brings up the graphics correctly. > > Add drm.debug=0xe to your boot commandline and compare if there is any > difference between a successful cold boot, a broken cold boot and a > warm boot. Similarly, comparing the output of intel_reg_dumper after > each should yield a few clues as to what stage in the boot process we > fail. -Chris
First an additional datum point: 2.6.37-rc1 works normally, so the bug is something introduced between 2.6.37-rc1 and 2.6.37-rc2 (to that extent it may be related to this bug which reports a similar phenomenon: http://lkml.org/lkml/2010/11/21/23 ).
Attached is the dmesg output from a successful cold boot with 2.6.37-rc2, an unsuccessful cold boot and an unsuccessful warm boot, each with drm.debug=0xe.
I can't provide the output of intel_reg_dumper: I can't compile the latest intel-gpu-tools from git (missing declaration/definition of I915_EXE_BLT). Probably something in a relevant library is too old.
Chris [unhandled content-type:application/x-gzip][unhandled content-type:application/x-gzip][unhandled content-type:application/x-gzip] | |