[Intel-gfx] [Regression] WARNING: drivers/gpu/drm/i915/i915_gem.c:4525 i915_gem_free_object

[Chris Wilson]

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

-- 
Chris Wilson, Intel Open Source Technology Centre