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<body><span class="vcard"><a class="email" href="mailto:ville.syrjala@linux.intel.com" title="Ville Syrjala <ville.syrjala@linux.intel.com>"> <span class="fn">Ville Syrjala</span></a>
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<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>
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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#c33">Comment # 33</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:ville.syrjala@linux.intel.com" title="Ville Syrjala <ville.syrjala@linux.intel.com>"> <span class="fn">Ville Syrjala</span></a>
</span></b>
<pre>(In reply to Martin Andersen from <a href="show_bug.cgi?id=91434#c32">comment #32</a>)
<span class="quote">> Tested with the latest kernel from drm-tip, 4.12.0-994_4.12.0-994. 50 & 60Hz
> modes only work intermittently, and with an erratic picture and white dots
> showing.
>
> Reverting to either the 24.000Hz or 23.976Hz modes produces a stable picture.</span >
Jun 18 15:11:33 meraxes kernel: [ 179.206299] [drm:intel_hdmi_set_edid [i915]]
DP dual mode adaptor (type 2 HDMI) detected (max TMDS clock: 300000 kHz)
Jun 18 15:11:33 meraxes kernel: [ 179.206401] [drm:drm_add_edid_modes.part.24
[drm]] HDMI: DVI dual 0, max TMDS clock 225000 kHz
Jun 18 15:11:33 meraxes kernel: [ 179.219332] [drm:intel_dump_pipe_config
[i915]] crtc timings: 148500 1920 2008 2052 2200 1080 1084 1089 1125, type: 0x0
flags: 0x5
Jun 18 15:11:33 meraxes kernel: [ 179.219362] [drm:intel_dump_pipe_config
[i915]] port clock: 222750, pipe src size: 1920x1080, pixel rate 148500
So both the projector and the DP->HDMI dongle are telling is that we can do
12bpc for 1080p @ 60hz, but the unstable picture is telling us something
different. I suspect the problem is with the dongle, the cable, or the
projector. Do you have other cables/dongles you can try?</pre>
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