Intel HD Graphics 4000 - hard lockups

[Daniel Kasak]

Hi all.

I've had quite a decent run with stability on my laptop, until recently.
I've been running realtime kernels for audio work, and up to 3.10.6-rt3,
it's been rock solid. After this, something has gone horribly wrong. I get
hard lockups from anything later I've built ( 3.12.10-rt15 and 3.12.11-rt17
). Sometimes it won't lock up right away, but will pause for a long period,
and when it starts responding again ( dropping to console, and back into X
will sometimes free it ) shows a bunch of 'stuck in render loop' / 'render
ring' ... or something ... kind of errors. I have followed instructions to
get more info on this if someone wants it.

Chrome seems to trigger lockups more than other things. I run a 3D
composited desktop ( Enlightenment-0.19 dev builds ), but I've tried with
Gnome-3.10 and this also gives lockups. I currently have mesa-10.0.3.

What can I do to try to debug this? Often, the magic sysrq keys don't
respond, but *occasionally* I can at least do an emergency sync.

Switching back to 3.10.6-rt3 makes things *rock* solid, but for various
reasons, I'd like to get to at least 3.12.x ( other driver issues ).

What's the state of Intel DRM drivers in the kernel? Should I be avoiding
building from the kernel, and using a git branch? Are there known issues
with the realtime patches?

Any help appreciated.

Dan
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