[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 #21 from Martin Andersen <martin.x.andersen at gmail.com> ---
Did several further tests today with the most recent 4.8.4 kernel on Ivy
Bridge.

The bug appears consistently, and produces no output on HDMI2 whatsoever using
any recent kernel versions, even when reverting to a blank xorg.conf (to avoid
issues with user-provided modelines) as well as downgrading the
xf86-video-intel driver (to 2.21.9-the last "known-good" version for
dual-display IVB)

According to the debug output, and output from xrandr, the system/drivers do
_think_ that the modes have been successfully switched, but again, there is not
output for either 60Hz, 50Hz, 24Hz & 23.976Hz on the secondary display. The
regular LCD panel is unaffected and -always- produces output.

See the provided drm.debug=0xe attachments, for 4.8.4/nonworking and
3.18.5/working - and *please* let me know whether any additional output would
be needed as I really want to solve this issue; it has prevented me from
upgrading this system for quite some time.

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