linux-kernel - Re: [REGRESSION] Re: i915 driver crashes on T540p if docking station attached

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Date:	Mon, 3 Aug 2015 17:27:29 +0200
From:	Daniel Vetter <daniel@...ll.ch>
To:	Theodore Ts'o <tytso@....edu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	intel-gfx <intel-gfx@...ts.freedesktop.org>,
	DRI <dri-devel@...ts.freedesktop.org>,
	Daniel Vetter <daniel.vetter@...el.com>,
	Mani Nikula <jani.nikula@...ux.intel.com>,
	Ander Conselvan de Oliveira 
	<ander.conselvan.de.oliveira@...el.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [REGRESSION] Re: i915 driver crashes on T540p if docking station
 attached

On Thu, Jul 30, 2015 at 11:50:29AM -0400, Theodore Ts'o wrote:
> On Thu, Jul 30, 2015 at 04:40:02PM +0200, Daniel Vetter wrote:
> > I have 4 patches in git://people.freedesktop.org/~danvet/drm fixes-stuff
> > but I couldn't test them yet since no dp mst here and I didn't find
> > anything that would ship faster than 1-2 weeks yet. I'll try to get some
> > other people here to test it meanwhile too.
> 
> I've tried pulling in your patches from fixes-stuff, onto Linus's tree
> (without Linus's fix), and the good news is that I'm no longer
> crashing on boot.
> 
> The *bad* news is that (a) it breaks the external monitor attached to
> the docking station completely (this was working with Linus's patch),
> and (b) it's triggering a LOCKDEP failure.
> 
> So even though Linus's patch wasn't supposed to work, I think I'm
> going to back to it....

Ok I updated fixes-stuff with just 2 patches which seem to be enough to
fix it. Plus a patch to convert Linus' hack into something we can keep
plus a drive-by WARNING fix in mst that got in the way for me.

Seems to work here in getting rid of the Oops. If this tests out for you
too I'll send a pull to Linus.

Thanks, Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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