[IVB] 24Hz (&23.976Hz) modes broken with recent xorg-video-intel drivers
Submitted by Martin Andersen
Assigned to Chris Wilson @ickle
Description
Created attachment 110582
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@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
**Attachment 110582**, "xrandr -q with custom (pre-tested) modelines, working perfectly on 13.04":
xrandr-q-custom-xorg.txt