black window when I start a 3d app

[Tony Pursell]

On Wed, 2011-05-18 at 16:00 +0800, Earthson wrote:
> 
> 
> I've found an error message:
> 
> 
> $ sudo glxgears 
> [sudo] password for earthson: 
> Running synchronized to the vertical refresh.  The framerate should be
> approximately the same as the monitor refresh rate.
> XIO:  fatal IO error 11 (Resource temporarily unavailable) on X server
> ":0.0"
>       after 33 requests (33 known processed) with 0 events remaining.
>  

Why are you using 'sudo'? glxgears will run as a normal user.

Have a look at your monitor settings.  The Monitors program will show
available resolutions and refresh rates.  If there is a choice of
refresh rates, try using a lower one if you are not currently using it. 

You could also try adding 

GRUB_CMDLINE_LINUX="radeon.modeset=1"

to your 

/etc/default/grub

then run

update-grub

You can also add "radeon.modeset=1" (without the quotes) on a one time
basis by altering the kernel parameters in grub when it starts up (if
you know how to do this) 

BTW, you don't need to email me direct as I do get everything on the
list as well.

Tony