linux-kernel - [REGRESSION] i915 KMS dual head broken on DELL latitude E6420 in 3.1-rc*

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Date:	Thu, 15 Sep 2011 01:27:17 +0200
From:	Samuel Thibault <samuel.thibault@...-lyon.org>
To:	keithp@...thp.com, dri-devel@...ts.freedesktop.org
Cc:	linux-kernel@...r.kernel.org
Subject: [REGRESSION] i915 KMS dual head broken on DELL latitude E6420 in
 3.1-rc*

Hello,

I'm trying to upgrade from 3.0 to 3.1-rcsomething on a DELL latitude
E6420, but dual head is broken. Here is the scenario:

- Turn computer on with VGA1 connected. Both LVDS1 and VGA1 show the
  text console fine.
- Start X. VGA1 shows X fine, but LVDS1 (1600x900 resolution) shows an
  odd screen: completely black on the left part (about 1060x900), sort
  of gray on the right part (about 540x900). Playing with xrandr doesn't
  help, I can at best make it completely black with --off, and not get
  it back again with --auto or anything else.

I have attached the corresponding dmesgs and Xorg.0.logs: as you can
see, the Xorg log doesn't change, while the dmesg changes a bit, I'm
getting a few 

[drm:ironlake_update_pch_refclk] *ERROR* enabling SSC on PCH

the rest is the same.

Samuel

View attachment "dmesg.good" of type "text/plain" (65192 bytes)

View attachment "dmesg.bad" of type "text/plain" (65003 bytes)

View attachment "Xorg.0.log.good" of type "text/plain" (46765 bytes)

View attachment "Xorg.0.log.bad" of type "text/plain" (46765 bytes)