[Bug 89996] New: Probed resolutions use incorrect aspect ratio

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89996

            Bug ID: 89996
           Summary: Probed resolutions use incorrect aspect ratio
           Product: xorg
           Version: git
          Hardware: x86-64 (AMD64)
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/intel
          Assignee: chris at chris-wilson.co.uk
          Reporter: mike at cchtml.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org

Created attachment 115040
  --> https://bugs.freedesktop.org/attachment.cgi?id=115040&action=edit
Intel Video ROM and Xorg log

Screen: native 2560x1440, 16:9
GPU: Core i7 4558U, Iris 5100, Haswell GT3
The attached Xorg log will show I'm using kernel 4.0 and the latest intel Xorg
driver. This same issue occurs with older kernels and older intel driver
versions.

Windows: All resolutions are available for all aspect ratios. Example, I can
set 1920x1080 without a problem.

Linux: Only the native resolution is provided for 16:9. The other resolutions
available are for 4:3 or 5:4.

$ xrandr 
Screen 0: minimum 8 x 8, current 2560 x 1440, maximum 32767 x 32767
eDP1 connected primary 2560x1440+0+0 (normal left inverted right x axis y axis)
294mm x 165mm
   2560x1440     59.95*+
   1920x1440     60.00  
   1856x1392     60.01  
   1792x1344     60.01  
   1600x1200     60.00  
   1400x1050     59.98  
   1280x1024     60.02  
   1280x960      60.00  
   1024x768      60.00  
   800x600       60.32    56.25  
   640x480       59.94  
DP1 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)

Other users of different laptops are reporting the same issue:
https://bugzilla.redhat.com/show_bug.cgi?id=1211058

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