New subject: [Bug 59866] QueryDisplayConfig Incorrectly Rounds FPS To Integer

June 14, 2026


      http://bugs.winehq.org/show_bug.cgi?id=59866

            Bug ID: 59866
           Summary: QueryDisplayConfig Incorrectly Ronuds FPS To Integer
           Product: Wine
           Version: 11.10
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: ntdll
          Assignee: wine-bugs@list.winehq.org
          Reporter: timothylottes@protonmail.com
      Distribution: ---

Using QueryDisplayConfig to get a display's
DISPLAYCONFIG_VIDEO_SIGNAL_INFO
Which has a very important field {DISPLAYCONFIG_RATIONAL vSyncFreq}
Which provides the display frame rate in N/D form (fractional)

WINE always rounds the actual display frame rate to an integer
So the N is set to the rounded rate
And the D part is set to '1'

I can verify this because I have a display which runs non-integer frame rates
And WINE incorrectly rounds the frame rates as described above

This is a rather serious bug
The suggested workaround is to correctly use the XRandR extension
To grab the CRTC data and fetch the dot clock for the N part
And the 'htotal*vtotal' for the D part

If you need more information, feel free to message me

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[Bug 59866] New: QueryDisplayConfig Incorrectly Ronuds FPS To Integer

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