GPU hang on ThinkPad T420 with drm-kmod on 12.0-RELEASE

[Pete Wright]

On 1/3/19 4:39 PM, Kevin Zheng wrote:
> Hi there,
>
> I don't know if anyone else has been having similar issues.
>
> On the ThinkPad T420 (i5-2540M, Sandybridge), the drm-kmod 
> (drm-fbsd12.0-kmod-4.16.g20181215) hangs like this, infrequently, but 
> often enough on GPU applications:
>
> [drm] GPU HANG: ecode 6:0:0x61f7fffd, in chrome [100694], reason: Hang 
> on rcs0, action: reset
> drmn0: Resetting chip after gpu hang
> last message repeated 1 times
> drmn0: i915_reset_device timed out, cancelling all in-flight rendering.
>
> It doesn't just hang with Chromium, it hangs on other apps as well.
>
> Tricky thing is that things otherwise seem to work, and I haven't 
> figured out how to reliably reproduce the hang.
>
> Particularly, https://wiki.freebsd.org/Graphics/Intel-GPU-Matrix 
> claims that other people have working Ivy Bridge with drm-kmod; maybe 
> that has to be drm-kmod-legacy until I figure out what's going on.
>
> Should I create a PR, or wait until I have more info?
>

Can you test out the drm-legacy-kmod pkg and see if that resolves these 
issues?  There was a recent user report that Ivy Bridge was working with 
the drm-kmod package, but it's possible I was mistaken there.

Cheers,
-pete


-- 
Pete Wright
pete at nomadlogic.org
@nomadlogicLA