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i915 [kernelpatch] for correct ext. video mode w/ closed lid
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asturm
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Joined: 05 Apr 2007
Posts: 8936
PostPosted: Wed Mar 16, 2011 11:39 pm    Post subject: i915 [kernelpatch] for correct ext. video mode w/ closed lid Reply with quote
If any of you are bugged by kms choosing the wrong external display resolution all the time, try this. Personally, I was having the issue all the way since 2.6.33 and ever since patching drm parts of the kernel to the master branch in the hope for cure.

I stumbled over this bugzilla entry today:
https://bugzilla.kernel.org/show_bug.cgi?id=27622

Chris Wilson's patch (works with vanilla 2.6.38, was the only one I needed) can be obtained from here:
http://git.kernel.org/?p=linux/kernel/git/ickle/drm-intel.git;a=commitdiff;h=01fe9dbde19a1a27b8ee63e2d964562962e1eb78

Don't forget to report success/failure to the bug, we really should have this entering linus' tree soon! :D
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asturm
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Joined: 05 Apr 2007
Posts: 8936
PostPosted: Fri Jun 10, 2011 9:53 pm    Post subject: Reply with quote
Code:
--- linux-2.6.39-rc1-git5/drivers/gpu/drm/i915/intel_lvds.c     2011-04-14 21:01:22.000000000 +0200
+++ linux-2.6.39-rc1-git4/drivers/gpu/drm/i915/intel_lvds.c     2011-04-17 15:02:07.000000000 +0200
@@ -473,13 +473,19 @@
 intel_lvds_detect(struct drm_connector *connector, bool force)
 {
        struct drm_device *dev = connector->dev;
-       enum drm_connector_status status;
+       enum drm_connector_status status = connector_status_connected;
 
        status = intel_panel_detect(dev);
        if (status != connector_status_unknown)
                return status;
 
-       return connector_status_connected;
+       /* ACPI lid methods were generally unreliable in this generation, so
+        * don't even bother.
+        */
+       if (IS_GEN2(dev) || IS_GEN3(dev))
+               return connector_status_connected;
+
+       return status;
 }
 
 /**

Simple revert to make things work even with latest 3.0.0_rc2.
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