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

From: Daniel Vetter
Date: Fri Mar 22 2013 - 05:13:07 EST

On Thu, Mar 14, 2013 at 4:15 PM, Takashi Iwai <tiwai@xxxxxxx> 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 -
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