Messages in this thread | | | Subject | Re: [Intel-gfx] Critical regression in 4.7-rcX | From | Larry Finger <> | Date | Fri, 15 Jul 2016 12:26:28 -0500 |
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On 07/15/2016 11:36 AM, Bish, Jim wrote: > 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@linux-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.
I'm not sure what I did wrong before, but when I retested mainline with the one liner, it now works. Once that is pushed to mainline, the bug should be fixed.
Sorry for any confusion.
Larry
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