[Bug 74266] New: [HD 4400] DisplayPort resolution limited to 1920x1200

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=74266

          Priority: medium
            Bug ID: 74266
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [HD 4400] DisplayPort resolution limited to 1920x1200
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: steven at midlink.org
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 93108
  --> https://bugs.freedesktop.org/attachment.cgi?id=93108&action=edit
Kernel Log

System environment:
-- chipset: i7-4500U / HD 4400
-- system architecture: 64-bit
-- xf86-video-intel: 2:2.99.904-0ubuntu2.1
-- xserver: 7.7+1ubuntu6
-- mesa: n/a
-- libdrm: 2.4.46-1ubuntu1
-- kernel: 3.13 (native 3.11 Distrokernel of Xubuntu 13.10 showed same
behaviour)
-- Linux distribution: Xubuntu 13.10
-- Machine or mobo model: Lenovo ThinkPad Yoga S1
-- Display connector: DisplayPort


This laptop only has a Mini-HDMI port builtin, however using a Docking Station
(OneLink Pro Dock) one gets a native DisplayPort (no USB graphics).

Attaching a monitor to the DP-Port of the Dock (Dell U2713HM, with 2560x1440
native resolution), running xrandr it will only show resolutions up to
1920x1200 and these modes seem to be usable.

Trying to override the mode (using newmode, addmode and --output DP1 --mode
...) results in "Configure crtc 1 failed" with both the EDID-provided values
and manually cvt-generated values.

Judging by the Kernel log (attached), the DRM parses the EDID correctly but
discards the 2560x1440 mode it provides.

As the monitor only supports its native Resolution over DP and I don't have any
other Monitors with such a resolution I couldn't test if using the Mini-HDMI
Port on the Laptop would allow for more than 1920x1200.

The monitor connected to the same machine and dock runs fine under Windows with
its native resolution 2560x1440. It also works perfectly fine on Linux on my
ThinkPad T420s (i5-2520M).

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