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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #14 from Martin Andersen <martin.x.andersen at gmail.com> ---
First off, sorry for the late reply.

The issue was not related to the display manager; it behaved the same when
launching the session via startx & .xinitrc (although this had to be done as
root/sudo due to access issues with direct rendering)

However, it also does not appear to be strictly driver-/kernel related either.

I was able to switch to a 24Hz mode when running in a MATE session. This was on
a secondary test system running on Haswell (not my primary Ivy Bridge one).
Interestingly, I was not able to launch any session via startx other than the
failing Cinnamon session.

What is curious is that I made several tests, using the WMs listed further up,
and they all behaved the same wrt. not being able to set the 24Hz mode. Those
tests were time consuming, and done a few months back using slightly older
version of the drivers and were run on IVB. 

So it appears that the bug report was somewhat misidentifying the issue. I'll
hopefully be able to perform some more tests this weekend and can close it
unless the behavior is inconsistent.

Tests were done on 3.13.5, btw. (didn't upgrade in order to get a better idea
of where the fault, if any, might have been.)

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