[Bug 91434] [IVB/HSW] 23.976Hz & 24Hz modes broken on dual-display with recent (4.0.x) kernels

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91434

--- Comment #25 from Martin Andersen <martin.x.andersen at gmail.com> ---
Jari,

Thanks for the resurrection. ;)

This longstanding issue does look quite similar to
https://bugs.freedesktop.org/show_bug.cgi?id=90128 - yes. Although that bug is
reported as being specific to Haswell, whereas this occurs on both Ivy Bridge
and Haswell - and possibly others (Sandy Bridge) Or it could obviously be that
the person reporting only has a Haswell system to test on.

Anyway; I will try the latest 4.11.0-994-* from drm-tip this weekend, and boot
the system with drm.debug=0xe. Hopefully I'll have time to test on both Haswell
& Ivy Bridge so we can get to the bottom of this sucker.

Looks like xf86-video-intel is still on the 2.99.917 version. (Good, as I don't
have to build a package for that as well.)

Would be interesting to see whether the output is still *completely blank*, or
if it instead produces the vertical banding reported in bug 90128. (I'm
guessing blank, as the projector only accepts a certain number of validated
modes..)

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