On 28 Feb, Chris Wilson wrote: > On Sat, Feb 28, 2015 at 03:20:37PM +0300, Andrey Skvortsov wrote: > > Unfortunately this is not the last bug, that breaks i915/drm working > > on my laptop. Sometimes system successfully loads with couple warnings mentioned in > > previous mail: > > > > [ 26.922953] WARNING: CPU: 1 PID: 767 at drivers/gpu/drm/i915/i915_gem.c:4525 i915_gem_free_object+0x13f/0x288 [i915]() > > [ 26.922954] WARN_ON(obj->frontbuffer_bits) > > That's inocuous, but for the serious hang, you may want to try > video=SVIDEO-1:d on the kernel commandline to workaround the hang. (Check > /sys/class/drm/card/ for the actual name of the connector for TV). I > think Ville mentioned he was looking/looked at the atomic-vs-load_detect > changes that is at the heart of the issue here. (Admittedly he did say > it was worthy of a drink or two.) > -Chris Thank you for the help. I've tried to add to the kernel command line 'video=card0-SVIDEO-1:d video=card0-VGA-1:d'. But despite of that kernel crashes with 'BUG: unable to handle kernel NULL pointer dereference at' occasionally. -- Best regards, Andrey Skvortsov
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