Hi
Just splitting this issue out...
In Ubuntu, with a monitor attached everything works as per VirtualGL
documentation. With it detached, Ubuntu, or rather Xorg/lightdm does not
load the Nvidia driver module because it cannot find a physical screen.
With other VNCs/remote desktop solutions this is ok because a 2D virtual
framebuffer is created. Obviously for us we need access to the real frame
buffer on the GPU, accessed through xorg's display :0.0 (usually this
value).
Symptoms of this issue with monitor detached:
- running $ vglrun ./glxinfo returns something like
Xlib: extension "GLX" missing on display ":2.0".
Error: couldn't find RGB GLX visual or fbconfig
- running $ xdpyinfo -d :0
No protocol specified
xdpyinfo: unable to open display ":0".
- Your /var/log/Xorg.0.log file attempts to load Nvidia module, but fails
with something like this:
[ 8951.242] (EE) No devices detected.
Fatal server error:
[ 8951.242] no screens found
followed by ceremonious unloading of your precious Nvidia module.
This is the problem with Ubuntu and xorg/lightdm.
The workaround is as follows:
- The screen/display needs to be successfully enabled and to do this you
can create/edit xorg.conf file to tell the Nvidia module that "there is a
monitor, trust me":
edit /etc/X11/xorg.conf:
...
Section "Device"
...
Option "ConnectedMonitor" "CRT-0"
Option "UseEDID" "FALSE"
EndSection
- then restart lightdm
$ sudo service lightdm restart
- Your /var/log/Xorg.0.log will have no NVIDIA(0) errors like lines with
"(EE)"
- This means your display :0.0 is available but only to root user. You get
the same symptoms as above but can now get access to basic tests such as
with sudo:
$ export XAUTHORITY=/var/run/lightdm/root/:0
$ sudo ./glxinfo -c -display :0
This is where I get stuck trying to make it all work with normal priveleged
user. How does vncserver and $HOME/.Xauthority work here? Can I link it to
/var/run/lightdm/root/:0 ?
My Environment:
- Ubuntu 12.04 64 bit on both client and server physical machines, both
intel 64 bit cpu, server has an Nvidia with pbuffer support.
- turbovnc_1.1_amd64.deb on both client and server
- virtualgl_2.3.1_amd64.deb, and virtualgl32_2.3.1_amd64.deb on server,
according to 2.3.1 documentation
- glxinfo on server shows glx vendor string: NVIDIA Corporation, p in the
'drw typ' column
- vglserver_config all usual, no limits in place
Cheers
Shanon
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