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deltamalloc Apprentice
Joined: 18 Jan 2013 Posts: 279
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Posted: Fri Aug 09, 2013 2:58 pm Post subject: OpenGL output, why is it cloned? |
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I just made a post about getting a virtual display stretched across two monitors, with the ability to move programs between them. While that was resolved, I have a new problem:
OpenGL output gets cloned to both displays when in full screen mode. This is very distracting, especially as the latency on the displays are different (although they are of the same size).
I only want the output to appear on one display, like it normally does with TwinView and in Windows.
My xorg.conf:
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Section "ServerLayout"
Identifier "aticonfig Layout"
Screen "Generic Screen" 0 0
EndSection
Section "Module"
EndSection
Section "Monitor"
Identifier "Monitor1"
Option "VendorName" "ATI Proprietary Driver"
Option "ModelName" "Generic Autodetecting Monitor"
Option "DPMS" "true"
Option "Position" "1920 0"
EndSection
Section "Monitor"
Identifier "Monitor2"
Option "VendorName" "ATI Proprietary Driver"
Option "ModelName" "Generic Autodetecting Monitor"
Option "DPMS" "true"
Option "Position" "0 0"
EndSection
Section "Device"
Identifier "AMD Radeon"
Driver "fglrx"
BusID "PCI:2:0:0"
Option "Monitor-DFP6" "Monitor1"
Option "Monitor-DFP7" "Monitor2"
EndSection
Section "Screen"
Identifier "Generic Screen"
SubSection "Display"
Virtual 3840 1200
EndSubSection
EndSection
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I noticed in the aticonfig tool this:
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--ovon, --overlay-on={0|1}
Choose which head the hardware overlay should be visible on. The
hardware overlay can be used for either OpenGL, video, pseudo-color
or stereo.
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So I tried that, which generated this option (in section Device):
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Option "OverlayOnCRTC2" "1"
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I don't even know what this is. But from the output of xrandr, I tried adapting it to one of my "DFP" displays. I used this option for my Device section:
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Option "OverlayOnDFP7" "1"
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To see if that would make OpenGL render to just one display. It didn't work. I also saw in the xorg log that the option got ignored.
I have also tried using the program "amdcccle" which is a GUI tool that apparently generates or modifies xorg.conf files. It does not have an option for this, or even something vaguely related.
Using TwinView with NVIDIA, this never was a problem, it would only render to one display.
I could also add that mplayer, even when using "-vo gl" as argument, does only render to one display, in full screen mode. |
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Ant P. Watchman
Joined: 18 Apr 2009 Posts: 6920
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Posted: Sat Aug 10, 2013 11:58 pm Post subject: |
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Does it work correctly with the xorg radeon driver? |
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deltamalloc Apprentice
Joined: 18 Jan 2013 Posts: 279
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Posted: Mon Aug 12, 2013 1:17 am Post subject: |
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Ant P. wrote: | Does it work correctly with the xorg radeon driver? |
I will have to reemerge and check. I know that it doesn't work with the radeon driver in the sense that there is some horrible flickering and other artifacts. However, I did not test full screen mode, I do now know if it clones the display or not. But I will check. |
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