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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - [IVB/HSW] 23.976Hz & 24Hz modes broken on dual-display with recent (4.0.x) kernels"
href="https://bugs.freedesktop.org/show_bug.cgi?id=91434#c26">Comment # 26</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - [IVB/HSW] 23.976Hz & 24Hz modes broken on dual-display with recent (4.0.x) kernels"
href="https://bugs.freedesktop.org/show_bug.cgi?id=91434">bug 91434</a>
from <span class="vcard"><a class="email" href="mailto:martin.x.andersen@gmail.com" title="Martin Andersen <martin.x.andersen@gmail.com>"> <span class="fn">Martin Andersen</span></a>
</span></b>
<pre>Ok - well, this was interesting. Now the situation as initially reported in the
bug is reversed: 24.00Hz & 23.976Hz modes work(!), however 50 & 60Hz modes
(which previously were the only ones to be outputted) *do not*. No output is
seen from the virtual terminal either.
Including debug output from my Haswell-based system. The steps taken after boot
are as follows:
martin@meraxes ~ $ xrandr --output HDMI2 --mode 1920x1080 --rate 24
(works!)
martin@meraxes ~ $ xrandr -q
martin@meraxes ~ $ xrandr --output HDMI2 --mode 1920x1080 --rate 23.976
(works!)
martin@meraxes ~ $ xrandr -q
martin@meraxes ~ $ xrandr --output HDMI2 --mode 1920x1080 --rate 60
(no signal)
martin@meraxes ~ $ xrandr --output HDMI2 --mode 1920x1080 --rate 50
(no signal)
martin@meraxes ~ $ xrandr -q
martin@meraxes ~ $ xrandr --output HDMI2 --mode 1920x1080 --rate 30
(30Hz, curiously, also works)
martin@meraxes ~ $ xrandr --output HDMI2 --mode 1920x1080 --rate 59.9
(no signal)
martin@meraxes ~ $ xrandr --output HDMI2 --mode 1920x1080 --rate 23.976
(works)
martin@meraxes ~ $ xrandr -q
martin@meraxes ~ $ xrandr --output HDMI2 --mode 1920x1080 --rate 50
(no signal after trying to switch for 10 secs)
martin@meraxes ~ $ xrandr -q
martin@meraxes ~ $ xrandr --output HDMI2 --mode 1920x1080 --rate 24
(works)
martin@meraxes ~ $ xrandr --output HDMI2 --mode 1920x1080 --rate 60
(no signal)
martin@meraxes ~ $ xrandr -q
martin@meraxes ~ $ xrandr --output HDMI2 --mode 1920x1080 --rate 23.976
(works)
The 23.976Hz mode is the rightmost on the 1920x1080 list given by xrandr;
$ xrandr -q
HDMI2 connected 1920x1080+2560+0 (normal left inverted right x axis y axis) 0mm
x 0mm
1920x1080 60.0 + 50.0 59.9 24.0 24.0*
1920x1080i 60.1 50.0 60.0
1280x720 60.0 50.0 59.9
1440x576 50.0
1440x480 60.0 59.9
720x576 50.0
720x576i 50.1
720x480 60.0 59.9
720x480i 60.1 60.1
640x480 60.0 59.9
VIRTUAL1 disconnected (normal left inverted right x axis y axis)</pre>
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