On 30 July 2012 22:05, siro@das-labor.org wrote:
As far as I understood CRTC 0 is disabled, because it is only capable of generating analog video signals. I'm using a HDMI monitor, which is controlled by CRTC 1. To use multihead (not clone), you have to connect a analog (VGA) and digital monitor (in my case). Each monitor will use one CRTC and each CRTC will show a different part of the same screen. With this in mind every active CRTC should be listed as "native Windows monitor".
Mostly for reference, what driver are you using? Have you explicitly configured a primary display at all (either through the xorg.conf "Primary" option for the monitor, or with the xrandr utility), or is it just picking up the first display connector and incorrectly assuming it's connected?
Am 01.08.2012 15:42, schrieb Henri Verbeet:
On 30 July 2012 22:05, siro@das-labor.org wrote:
As far as I understood CRTC 0 is disabled, because it is only capable of generating analog video signals. I'm using a HDMI monitor, which is controlled by CRTC 1. To use multihead (not clone), you have to connect a analog (VGA) and digital monitor (in my case). Each monitor will use one CRTC and each CRTC will show a different part of the same screen. With this in mind every active CRTC should be listed as "native Windows monitor".
Mostly for reference, what driver are you using? Have you explicitly configured a primary display at all (either through the xorg.conf "Primary" option for the monitor, or with the xrandr utility), or is it just picking up the first display connector and incorrectly assuming it's connected?
I'm using ATI driver with xorg.conf but there's no "Primary" option. I investigated some time and found the problem: xrandr reports 0 outputs on the first disabled crtc, but there is a "connected" outputs that block this crtc. Connected means that it is plugged in weather or not it is powered or in use. This is why xrandr connects my "primary" monitor to crtc 1. After unplugging all other monitors crtc 0 is used. This example shows that with xrandr 1.2 multi-head support is necessary. To introduce multihead support every CRTC that has "connected" primary outputs should be seen as display-device. Since Windows is aware of disabled display-devices this should be no problem. EnumDisplayDevices should return all this CRTCs and let the application decide which to choose.
Regards, Patrick
On 1 August 2012 17:47, Patrick Rudolph siro@das-labor.org wrote:
Am 01.08.2012 15:42, schrieb Henri Verbeet:
Mostly for reference, what driver are you using? Have you explicitly configured a primary display at all (either through the xorg.conf "Primary" option for the monitor, or with the xrandr utility), or is it just picking up the first display connector and incorrectly assuming it's connected?
I'm using ATI driver with xorg.conf but there's no "Primary" option.
Does it get any better if you add it?
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Henri Verbeet -
Patrick Rudolph