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    SubjectRe: [regression] Re: 4.11-rc0, thinkpad x220: GPU hang
    Hi!

    > > > > > > mplayer stopped working after a while. Dmesg says:
    > > > > > >
    > > > > > > [ 3000.266533] cdc_ether 2-1.2:1.0 usb0: register 'cdc_ether' at
    > > > >
    > > > > Now I'm pretty sure it is a regression in v4.11-rc0. Any ideas what to
    > > > > try? Bisect will be slow and nasty :-(.
    > > >
    > > > I came the conclusion that #99671 is the ring HEAD overtaking the TAIL,
    > > > and under the presumption that your bug matches (as the symptoms do):
    > > >
    > > > diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
    > > > index 4ffa35faff49..62e31a7438ac 100644
    > > > --- a/drivers/gpu/drm/i915/intel_ringbuffer.c
    > > > +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
    > > > @@ -782,10 +782,10 @@ static void i9xx_submit_request(struct drm_i915_gem_request *request)
    > > > {
    > > > struct drm_i915_private *dev_priv = request->i915;
    > > >
    > > > - i915_gem_request_submit(request);
    > > > -
    > > > GEM_BUG_ON(!IS_ALIGNED(request->tail, 8));
    > > > I915_WRITE_TAIL(request->engine, request->tail);
    > > > +
    > > > + i915_gem_request_submit(request);
    > > > }
    > > >
    > > > static void i9xx_emit_breadcrumb(struct drm_i915_gem_request *req, u32 *cs)
    > >
    > > I applied it as:
    > >
    > > diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
    > > index 91bc4ab..9c49c7a 100644
    > > --- a/drivers/gpu/drm/i915/intel_ringbuffer.c
    > > +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
    > > @@ -1338,9 +1338,9 @@ static void i9xx_submit_request(struct drm_i915_gem_request *request)
    > > {
    > > struct drm_i915_private *dev_priv = request->i915;
    > >
    > > - i915_gem_request_submit(request);
    > > -
    > > I915_WRITE_TAIL(request->engine, request->tail);
    > > +
    > > + i915_gem_request_submit(request);
    > > }
    > >
    > > static void i9xx_emit_breadcrumb(struct drm_i915_gem_request *req,
    > >
    > > Hmm. But your next mail suggest that it may not be smart to try to
    > > boot it? :-).
    >
    > Don't bother, it'll promptly hang.

    Any news here?

    Is there something I can revert to get back to working system?

    Thanks,
    Pavel
    --
    (english) http://www.livejournal.com/~pavelmachek
    (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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