linux-kernel - Re: [Intel-gfx] Critical regression in 4.7-rcX

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Message-ID: <1468600589.8910.6.camel@intel.com>
Date:	Fri, 15 Jul 2016 16:36:48 +0000
From:	"Bish, Jim" <jim.bish@...el.com>
To:	"ville.syrjala@...ux.intel.com" <ville.syrjala@...ux.intel.com>,
	"Larry.Finger@...inger.net" <Larry.Finger@...inger.net>,
	"daniel.vetter@...ll.ch" <daniel.vetter@...ll.ch>
CC:	"torvalds@...ux-foundation.org" <torvalds@...ux-foundation.org>,
	"intel-gfx@...ts.freedesktop.org" <intel-gfx@...ts.freedesktop.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Shrivastava, Shubhangi" <shubhangi.shrivastava@...el.com>
Subject: Re: [Intel-gfx] Critical regression in 4.7-rcX

On Fri, 2016-07-15 at 10:34 -0500, Larry Finger wrote:
> On 07/15/2016 09:43 AM, Ville Syrjälä wrote:
> > 
> > On Fri, Jul 15, 2016 at 04:27:27PM +0200, Daniel Vetter wrote:
> > > 
> > > On Fri, Jul 15, 2016 at 8:55 AM, Linus Torvalds
> > > <torvalds@...ux-foundation.org> wrote:
> > > > 
> > > > On Thu, 14 Jul 2016, Larry Finger wrote:
> > > > > 
> > > > > To anyone keeping track of regressions in kernel 4.7, I call
> > > > > your attention to
> > > > > https://bugs.freedesktop.org/show_bug.cgi?id=96675.
> > > > > 
> > > > > This bug causes driver i915 to fail to connect to the
> > > > > display, and results in
> > > > > a blank screen as soon as the kernel is loaded. The only way
> > > > > to operate with
> > > > > kernel 4.7 is to add "nomodeset" to the command line. The
> > > > > problem was bisected
> > > > > to commit f21a21983ef13a ("drm/i915: Splitting
> > > > > intel_dp_detect").
> > > > Daniel? Jani? Time to revert?
> > > Yup. Means that I'll get to revert a pile of patches (plus even
> > > more
> > > in -next), but that's what we get for not handling regressions
> > > timely.
> > > Dave poked me about the same bug already too. But will take a few
> > > days
> > > until the pull is in your inbox I guess.
> > I attached a oneliner to the bug today, that I *think* should fix
> > the
> > problem.
> After I checked out the problem commit and built that kernel with the
> one-line 
> patch, the display works; however, mainline still fails. I am
> currently 
> bisecting to find what other commit fails. At a minimum, we should be
> able to 
> reduce the number of commits that need reverting.
> 
> Larry
I was seeing the same issue Linus reported but very sporadically.
 Assumed it was due to my wierd configuration - eDP + usb type c -> MST
hub -> DVI KVM -> dual head HDMI.  Checked out the one liner - works
for me but I guess there are still other failures.

Jim
> 
> 
> 
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@...ts.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/intel-gfx

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