[Bug 107064] New: xrandr does not correctly switch display refresh rates, but pretends it did

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107064

            Bug ID: 107064
           Summary: xrandr does not correctly switch display refresh
                    rates, but pretends it did
           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: fdbugs at fratti.ch
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 140380
  --> https://bugs.freedesktop.org/attachment.cgi?id=140380&action=edit
xrandr fails to set the mode correctly, but claims it is in 48 Hz mode

Telling xrandr to switch to 48 Hz mode with `xrandr --rate 48` makes the screen
go black for a moment, and xrandr says it is now running at 48 Hz, but
applications which wait for vsync still swap roughly 60 times per second.

The display is connected to eDP.

$ uname -r
4.18.0-rc2-drm-tip+
$ uname -m
x86_64

See the attachment for a log of me running xrandr to show the current state,
then switching the output refresh rate, then running xrandr to show it again,
and then running glxgears to show that it's still swapping at roughly 60 Hz.

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