[Bug 89805] New: [GM45 DP-DVI dongle] KMS often does not set native display resolution

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89805

            Bug ID: 89805
           Summary: [GM45 DP-DVI dongle] KMS often does not set native
                    display resolution
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: andreas.sturmlechner at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 114684
  --> https://bugs.freedesktop.org/attachment.cgi?id=114684&action=edit
20150328-2050_4.0.0-rc5+-start_dmesg-ignorelid_wrong-res.log

This is a followup to bug 58876. My setup is a Thinkpad X200s (lid closed)
sitting on an Ultrabase docking station, connected to a 1920x1200 DVI monitor
by means of a DP-DVI dongle. 4.0.0 is the first kernel version since 3.7 that
always seems to detect my external display: What previously most of the time
ended with a black screen / standby now seems to have been replaced with KMS
not setting the correct resolution. In the end KDE adjusts this correctly
anyway, so this behaviour is already a big improvement, but it would be nice to
get this ironed out as well.

I usually have to set i915.panel_ignore_lid=0 so that KMS is able to use all of
the external screen estate and make it not align a limited output to the upper
and left side, this setting also affects outcome with this bug:

If i915.panel_ignore_lid=0, then some very low standard resolution is set.
else, the LVDS panel's native resolution seems to be set for the external
screen.

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