linux-kernel - Re: [Intel-gfx] Regression: HSW eDP broken on 3.9-rc[12]

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Date:	Fri, 22 Mar 2013 10:12:54 +0100
From:	Daniel Vetter <daniel@...ll.ch>
To:	Takashi Iwai <tiwai@...e.de>
Cc:	intel-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [Intel-gfx] Regression: HSW eDP broken on 3.9-rc[12]

On Thu, Mar 14, 2013 at 4:15 PM, Takashi Iwai <tiwai@...e.de> wrote:
> I noticed that a Haswell desktop machine with eDP gets only the blank
> screen on the latest Linus tree.  It works fine with 3.8, so it's a
> regression since 3.9-rc1.  Actually, it's not a regression.  It's
> three regressions in a shot! (I had to do painful bisections three
> times...)
>
> c464b2a17c59adedbdc02cc54341d630354edc3
>     drm/i915: set TRANSCODER_EDP even earlier
>
> d6dd9eb1d96d2b7345fe4664066c2b7ed86da898
>     drm/i915: dynamic Haswell display power well support
>
> commit cf0a6584aa6d382f802f2c3cacac23ccbccde0cd
>     drm/i915: write backlight harder
>
>
> The first commit affects no matter whether power well is on or off.
> It brings the eDP output always blank.

Can you please attach the xrandr output and drm.debug=0xe dmesg from
booting for that hsw eDP machine quickly?

Thanks, Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
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