[PATCH] drm: Add EDID_QUIRK_FORCE_REDUCED_BLANKING for LG SL80

From: Paul Menzel <paulepanter@users.sourceforge.net>
To: dri-devel@lists.freedesktop.org
Cc: Ian Pilcher <arequipeno@gmail.com>, stable@vger.kernel.org
Subject: [PATCH] drm: Add EDID_QUIRK_FORCE_REDUCED_BLANKING for LG SL80
Date: Wed, 15 Aug 2012 17:18:06 +0200	[thread overview]
Message-ID: <1345043886.4264.19.camel@mattotaupa> (raw)


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Date: Wed Aug 15 17:10:51 2012 +0200

Connecting a LG SL80 [1] a garbled screen is shown with vertical stripes
in the top half.

In commit bc42aabc [2]

        commit bc42aabc6a01b92b0f961d65671564e0e1cd7592
        Author: Adam Jackson <ajax@redhat.com>
        Date:   Wed May 23 16:26:54 2012 -0400

            drm/edid/quirks: ViewSonic VA2026w

Adam Jackson added the quirk `EDID_QUIRK_FORCE_REDUCED_BLANKING` which
is also needed for this LG TV.

All log files and output from `xrandr` is included in the referenced
Bugzilla report #53544.

[1] http://www.lg.com/de/tv-heimkino-blu-ray/tv/LG-lcd-tv-42SL8000.jsp
[2] http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commit;h=bc42aabc6a01b92b0f961d65671564e0e1cd7592

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=53544
Signed-off-by: Paul Menzel <paulepanter@users.sourceforge.net>
Cc: <dri-devel@lists.freedesktop.org>
Cc: Adam Jackson <ajax@redhat.com>
Cc: Ian Pilcher <arequipeno@gmail.com>
Cc: <stable@vger.kernel.org>
---
Same as in previous patch:

Ian, I did not base this patch on your series, to make it easier to get
back ported. I can easily rebase it though, so hopefully some maintainer
can tell me what to do.
---
 drivers/gpu/drm/drm_edid.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index eb452e6..75e252e 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -94,6 +94,9 @@ static struct edid_quirk {
 	/* Unknown Acer */
 	{ "ACR", 2423, EDID_QUIRK_FIRST_DETAILED_PREFERRED },
 
+	/* LG SL80 */
+	{ "GSM", 1, EDID_QUIRK_FORCE_REDUCED_BLANKING },
+
 	/* Belinea 10 15 55 */
 	{ "MAX", 1516, EDID_QUIRK_PREFER_LARGE_60 },
 	{ "MAX", 0x77e, EDID_QUIRK_PREFER_LARGE_60 },
-- 
1.7.10.4

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