[Intel-gfx] Dell U2412M monitor complains about input timing

[Christian Kreibich]

Hi all,

I hope I have found the right forum for asking my question -- apologies
if that's not the case. I have a Dell U2412M connected to a Dell
StudioSlim 540s, with the i915 driver on Fedora's 3.9.6 Kernel running
KDE (4.10.4). The monitor is connected via an HDMI cable, with a DVI
adapter to the monitor. When booting up my machine into X or waking it
from sleep, things work perfectly. However, when I turn off the monitor
(or whenever it turns itself off, if configured to do so) while the PC
keeps running, I have a hard time getting the monitor to work when
turning it on again. One of three things happens:

(1) The monitor pops up a message saying that "The current input timing
is not supported by the monitor display. Please change your input to
1920x1200 at 60Hz".

(2) The expected desktop contents appear on screen, but only for a
fraction of a second. Then the monitor goes blank again for a few
seconds, and this iterates until I turn it off again.

(3) Things work as expected, but unfortunately only after turning the
monitor on and off on the order of a dozen times. Even then, the
configuration is a bit wonky (for example, xrandr shows all connections
disconnected).

I have the monitor configured to 1920x1200 at 60Hz both in KDE's settings
and via variations of an xorg.conf (including no xorg.conf) in which I
expressly state that this is what my monitor needs.

I'm wondering if the problem might be HDMI-related and whether it sounds
familiar to folks on this list. Any help is welcome.

Cheers,
Christian