[Bug 111410] New: Gemini Lake - can't change refresh rate with default EDID and loading of custom EDID fails with eDP

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111410

            Bug ID: 111410
           Summary: Gemini Lake - can't change refresh rate with default
                    EDID and loading of custom EDID fails with eDP
           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: tempel.julian at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Device is a Trekstor Surfbook A13B notebook with Celeron N4000 (Graphics 600)
SoC. It features a 1080p eDP display (without panel self refresh feature).

The display's default EDID offers 59.9xHz and 48Hz for 1080p.
But: When switching to the 48Hz resolution via xrandr, the display continues
running with 59.9xHz. Though some applications expect 48Hz then (e.g. mpv),
causing bad stutter.
On Windows, changing refresh rate to 48Hz works without issues.

Also, loading a custom EDID or using custom Xorg modelines doesn't help, the
display always runs with 59.9xHz and the resolutions/refresh rates of the
custom EDID aren't even parsed correctly (only 59.9xHz are offered).
Furthermore, the display then only runs with limited brightness level range,
causing a washed out look.
On Windows, installing the very same EDID as custom monitor driver works
correctly: The resolutions/refresh rates are parsed correctly, it correctly
uses full range brightness levels and the display actually switches to the
target refresh rates.

Not being able to use different refresh rates is quite annoying, as watching
movies etc. is not optimal with 59.9xHz.

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