linux-kernel - Skylake graphics regression: projector failure with 4.8-rc3

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Message-ID: <1472217035.5189.50.camel@HansenPartnership.com>
Date:   Fri, 26 Aug 2016 09:10:35 -0400
From:   James Bottomley <James.Bottomley@...senPartnership.com>
To:     intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org
Cc:     linux-kernel <linux-kernel@...r.kernel.org>
Subject: Skylake graphics regression: projector failure with 4.8-rc3

We seem to have an xrandr regression with skylake now.  What's
happening is that I can get output on to a projector, but the system is
losing video when I change the xrandr sessions (like going from a -
-above b to a --same-as b).  The main screen goes blank, which is
basically a reboot situation.  Unfortunately, I can't seem to get the
logs out of systemd to see if there was a dump to dmesg (the system was
definitely responding).

I fell back to 4.6.2 which worked perfectly, so this is definitely some
sort of regression.  I'll be able to debug more fully when I get back
home from the Linux Security Summit.

James

View attachment "Xorg.0.log" of type "text/x-log" (27983 bytes)

View attachment "dmesg.txt" of type "text/plain" (68292 bytes)