Created attachment 24876 [details]
Gigabyte GA-MA69GM-S2H with IGP Radeon X1250
01:05.0 VGA compatible controller: ATI Technologies Inc RS690 [Radeon X1200 Series]
Two displays connected:
Normal LCD Display connected to VGA and is working.
LCD-TV connected to HDMI and does not show anything, i.e. it seems not to get any signal. Yet, the software seems to think, that the display is enabled, because I can move the mouse on the second monitor (of course, i cannot see it there anymore).
MS Windows can use both displays correctly and some version of fglrx worked, too.
I used the following xrandr command:
xrandr --output DVI-D_1 --crtc 1 --mode 1024x768 --right-of VGA_1
and the attached xorg.conf.
output of xrandr --verbose and the xorg.log are attached.
Created attachment 24877 [details]
Created attachment 24878 [details]
xrandr --output DVI-D_1 --mode 0x50
Maybe your monitor doesn't like 75Hz framerate despite advertising it. Though I doubt that this is the main issue, as you already tried the native 1920x1080 mode.
xrandr --output DVI-D_1 --set _Coherent 1
Another idea would be to try
# xrandr --output DVI-D_1 --mode 0x50
xrandr: cannot find mode 0x50
Setting Coherent and UseAtomBIOS both have no visible effect.
In the meantime I gave a try to the radeon driver and shows output on both displays without any tweaking.
Does this issue occur with the preferred ati driver (xf86-vide-ati)? If so, please move this to the Driver/Radeon component.
Development of radeonhd has pretty much halted and development focus is on the ati driver. Please see http://www.x.org/wiki/radeonhd
If the issue does not exist in the ati driver (or if there is no response to this message), this bug will be closed as WONTFIX unless someone contributes a patch.
Closing due to lack of response. Please reopen and move to the Driver/Radeon
component if this issue persists with xf86-video-ati