Found http://bugs.freedesktop.org/show_bug.cgi?id=16151 today and removed the
following line which I added in order to use external monitors:
Virtual 2048 2048
Afterwards the error message was not displayed anymore, and also 'glxinfo |
grep rendering' returns now 'direct rendering: Yes'. To be able to expand
(cloning works with the default maximum of 1024x1024) my desktop I tried
several values, and while 2048x1900 did not work I found
Virtual 2048 1820
is working and gives me the possibility to use a [1400|1680]x1050 display
together with my internal 1024x768 laptop screen.
I have no idea, why 2048x2048 does not work, although this value can be found
as the maximum value direct rendering works with in most places, but the
slightly lower resolution for the virtual screen works for me. But don't
hesitate to ask, I'm happy to help or test.
Sten
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