From mboxrd@z Thu Jan 1 00:00:00 1970 From: Knut Petersen Subject: [PATCH] Fix i915 drm regression on AOpen i915GMm-HFS motherboard Date: Mon, 03 Jan 2011 15:25:05 +0100 Message-ID: <4D21DC41.8070408@t-online.de> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15 Content-Transfer-Encoding: 7bit Return-path: Sender: linux-kernel-owner@vger.kernel.org To: airlied@linux.ie Cc: eric@anholt.net, jesse.barnes@intel.com, Linus Torvalds , linux-kernel@vger.kernel.org, intel-gfx , gregkh@suse.de List-Id: intel-gfx@lists.freedesktop.org Hi everybody! The AOpen i915GMm-HFS is a desktop motherboard for the Intel Pentium M. A mobile chipset is used (Intel 915GM / ICH6-M). Kernel 2.6.31.14 works fine for that mobo, but from 2.6.32 on graphics support is broken because the i915 driver "detects" an lvds device with a resolution of 1024x768 pixels that in reality is not present. Unfortunately the driver assumes that the "detected" lvds is the primary screen and uses the wrong resolution also for the real VGA and DVI connectors. Obvious solution: The motherboard needs an entry in the intel_no_lvds blacklist in intel_lvds.c Kernel version Comment ====================== 2.6.37-rc8-git2 patch applies cleanly and fixes the problem. 2.6.36.2: patch applies with a few lines offset, fixed the problem 2.6.32 to 2.6.35: Not tested 2.6.31 / older Not needed Signed-off-by: Knut Petersen --- linux-2.6.37-rc8-git2/drivers/gpu/drm/i915/intel_lvds.c 2010-12-29 02:05:48.000000000 +0100 +++ linux-2.6.37-rc8-git2-kp/drivers/gpu/drm/i915/intel_lvds.c 2011-01-03 13:48:38.000000000 +0100 @@ -708,6 +708,14 @@ static const struct dmi_system_id intel_ DMI_MATCH(DMI_PRODUCT_VERSION, "AO00001JW"), }, }, + { + .callback = intel_no_lvds_dmi_callback, + .ident = "AOpen motherboard i915GMm-HFS", + .matches = { + DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"), + DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"), + }, + }, { .callback = intel_no_lvds_dmi_callback, .ident = "Clientron U800",