[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 #10 from Martin Andersen <martin.x.andersen at gmail.com> ---
Do you mean window manager, or display manager?

I am obviously running a display manager (like most other people). The same
display manager which worked properly in 13.04 (mdm).

As for window manager, I've verified this behaviour across several, which
include:

- Cinnamon
- XFCE
- Unity
- IceWM
- Gnome (classic/flashback)

So it does not appear to be related to a specific WM.

Just out of curiosity; are you able to set a 24Hz mode on an external screen
with any of your test setups, assuming you have a 24Hz-cable external screen?
(if so, on which DM & WM?)

If there really is some obscure component causing this, I would naturally like
to get it identified.

I might not have time to run a full gdb trace for Xorg while testing this week,
but if I do I'll post it. Hopefully I can attach gdb to the running process and
do a thread apply all bt.

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