On Sat, 01 Mar 2014, Daniel Kasak d.j.kasak.dk@gmail.com wrote:

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.

I think the first step would be to try vanilla non-rt kernels, maybe a kernel matching what you've tried, or the latest v3.13 or v3.14-rc's. It will be easier to proceed from there depending on the outcome.

BR, Jani.