This is a note to let you know that I've just added the patch titled
udldrmfb: Fix EDID not working with monitors with EDID
to the 3.7-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
udldrmfb-fix-edid-not-working-with-monitors-with-edid.patch
and it can be found in the queue-3.7 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From c930812fe5ebe725760422c9c351d1f6fde1502d Mon Sep 17 00:00:00 2001
From: Hans de Goede <[email protected]>
Date: Fri, 11 Jan 2013 12:08:56 +0100
Subject: udldrmfb: Fix EDID not working with monitors with EDID
extension blocks
From: Hans de Goede <[email protected]>
commit c930812fe5ebe725760422c9c351d1f6fde1502d upstream.
udldrmfb only reads the main EDID block, and if that advertises extensions
the drm_edid code expects them to be present, and starts reading beyond the
buffer udldrmfb passes it.
Although it may be possible to read more EDID info with the udl we simpy don't
know how, and even if trial and error gets it working on one device, that is
no guarantee it will work on other revisions. So this patch does a simple fix
in the form of patching the EDID info to report 0 extension blocks, this
fixes udldrmfb only doing 1024x768 on monitors with EDID extension blocks.
Signed-off-by: Hans de Goede <[email protected]>
Signed-off-by: Dave Airlie <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/gpu/drm/udl/udl_connector.c | 8 ++++++++
1 file changed, 8 insertions(+)
--- a/drivers/gpu/drm/udl/udl_connector.c
+++ b/drivers/gpu/drm/udl/udl_connector.c
@@ -57,6 +57,14 @@ static int udl_get_modes(struct drm_conn
edid = (struct edid *)udl_get_edid(udl);
+ /*
+ * We only read the main block, but if the monitor reports extension
+ * blocks then the drm edid code expects them to be present, so patch
+ * the extension count to 0.
+ */
+ edid->checksum += edid->extensions;
+ edid->extensions = 0;
+
drm_mode_connector_update_edid_property(connector, edid);
ret = drm_add_edid_modes(connector, edid);
kfree(edid);
Patches currently in stable-queue which might be from [email protected] are
queue-3.7/udldrmfb-udl_get_edid-usb_control_msg-buffer-must-not-be-on-the-stack.patch
queue-3.7/epoll-prevent-missed-events-on-epoll_ctl_mod.patch
queue-3.7/udldrmfb-udl_get_edid-drop-unneeded-i.patch
queue-3.7/udldrmfb-fix-edid-not-working-with-monitors-with-edid.patch
--
To unsubscribe from this list: send the line "unsubscribe stable" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
