[Bug 97994] New: [REGRESS] [BISECT] [i915] Monitor resolution lost

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97994

            Bug ID: 97994
           Summary: [REGRESS] [BISECT] [i915] Monitor resolution lost
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: daniel.otero at outlook.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 126917
  --> https://bugs.freedesktop.org/attachment.cgi?id=126917&action=edit
xrandr --verbose output on kernel 4.7

>From kernel version 4.7 onwards, I lost the monitor native resolution of
2560x1080, which was automatically detected without any X configuration.

I bisected the culprit commit, and the chosen one was:

commit 55d7f30ee1096474cb5bdbca46b60f23ce8b1f83
drm/i915: Determine DP++ type 1 DVI adaptor presence based on VBT

I don't know how to go any further by myself, but can follow almost any steps
you give me to help diagnose the issue.

Thank you.

My config is:

-- system architecture: x86_64
-- kernel version: 4.7.5
-- Linux distribution: Arch Linux
-- Machine or mother board model:
   - Motherboard: Asus B75M-PLUS
   - CPU: Intel(R) Core(TM) i5-3470S
   - GPU: Intel® HD Graphics 2500 (integrated)
   - Monitor: LG(R) Ultrawide 21:9 29UM67-P
-- Display connector: HDMI

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