[Bug 87112] New: 24Hz (&23.976Hz) modes broken with recent drivers

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87112

            Bug ID: 87112
           Summary: 24Hz (&23.976Hz) modes broken with recent drivers
           Product: xorg
           Version: 7.7 (2012.06)
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/intel
          Assignee: chris at chris-wilson.co.uk
          Reporter: martin.x.andersen at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org

Created attachment 110582
  --> https://bugs.freedesktop.org/attachment.cgi?id=110582&action=edit
xrandr -q with custom (pre-tested) modelines, working perfectly on 13.04

24.000Hz/23.976Hz refreshrates are broken with recent drivers when running in
dual-head (and also single-head last time I tested)

Correct modes are displayed by xrandr when using custom modelines, but any
attempt to switch to the mode (which is known to be working) results in a 60Hz
output.

This has been verified with recent (14.04) drivers (incl. newest 01.org
versions) on Haswell and Ivy Bridge setups.

Running 'xrandr --output HDMI2 --mode 1920x1080 at 23.97610' with the older,
working drivers works as expected (see version information below)

Version information for broken behaviour:

- i965-va-driver:amd64                        1.4.0-0intel1
- libdrm-intel1:amd64                         2.4.56-1
- libva1:amd64                                1.4.0-0intel1
- xserver-xorg                                1:7.7+1ubuntu8
- xserver-xorg-video-intel                    2:2.99.911-0intel1
- libgl1-mesa-dri:amd64                       10.3.0-0ubuntu2intel1


Version information for correct behaviour:

- i965-va-driver                              1.2.1-1
- libdrm2                                     2.4.46
- libva1                                      1.2.1-1
- xserver-xorg-core                           1.13.3
- xserver-xorg-video-intel                    2.21.9
- libgl1-mesa-dri:amd64                       9.1.7

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