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Old 11-06-2012, 06:09 PM   #1
Registered: Apr 2004
Location: Europe
Distribution: Debian, Slackware
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xrandr and hardware acceleration (opengl)

I have an old IBM thinkpad R50 and an IBM Port Replicator II, which I use to connect the laptop to my TV set. The machine has ATI Radeon 7500 video card and It's running Linux Mint version 9.

When I connect the machine to the dock I run something like this:

xrandr --output VGA-0 --auto --size 1360x768 --mode 1360x768
xrandr --output LVDS --off

The switch works perfectly, but the problem is that Open GL acceleration doesn't seem to work on the external screen (TV) anymore, though I'm certain that it did work before.

I remember that at some point there used to be an additional command I needed to run (xrender something something perhaps...? I'm not sure about the name of the binary, though) in addition to the two above to get the acceleration working on the external screen. Then at some point the command binary disappeared, but the acceleration seemed to work fine without it. Now it has ceased to work (likely due to some X upgrade), so what do I need to do the get it working again?

Note that Open GL works just fine on the internal screen of the laptop.

Last edited by alienDog; 11-06-2012 at 06:15 PM.
Old 11-06-2012, 06:57 PM   #2
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In what way does it OpenGL acceleration not work? How are you testing this and what are you seeing?
Old 11-14-2012, 12:40 PM   #3
Registered: Apr 2004
Location: Europe
Distribution: Debian, Slackware
Posts: 505

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I'm seeing incredibly slooooow graphics in all OpenGL apps. For example: I like to use Photopile (which uses OpenGL) to show my photos on the television screen when the machine is connected to it. The screen update of photopile is much much slower on the external screen compared to the laptop's internal screen.

Last edited by alienDog; 11-14-2012 at 12:42 PM.


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