[Bug 92283] New: Dell XPS12 Haswell physical modeset resolution wrong with 640 x 480 synmark_ogldrvstate

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92283

            Bug ID: 92283
           Summary: Dell XPS12 Haswell physical modeset resolution wrong
                    with 640 x 480 synmark_ogldrvstate
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: minor
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: tomix.p.sarvela at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Running the newest drm-intel git kernels show bug running Synmark2 OglDrvState
in older Dell XPS12 machine (Haswell i3-4010U).

Symptom is that the test runs; kernel and X think they are in 640x480 mode
(screenshot taken is 640x480), but physically display is distorted and
1920x1080 mode.

Bisecting the problem found commit

commit 6764e9f8724f1231b4deac53b9a82286ac0830e7
Author: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
Date:   Thu Aug 27 15:44:06 2015 +0200

    drm/i915: skip modeset if compatible for everyone.

    This is done as a separate commit, to make it easier to revert
    when things break.

    Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
    Reviewed-by: Jesse Barnes <jbarnes at virtuousgeek.org>
    Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>

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