FIXED: Compiz + nvidia GeForce 6150

[Tom Evans]

On Fri, 2008-05-02 at 09:26 -0700, Rudy wrote:
> > compiz --sm-disable --replace ccp
>  > Without indirect-rendereing, the Desktop goes black, and newly 
> launched windows are all black:
> 
> 
> DOH!
> 
> I rebooted and upped the Frame Buffer from 32M to 256M in the BIOS menu. 
> 
> 
> 
> Also, I added UseEvents=false.  Which fixed it?  I'll never know!
> Here is the diff on the Xorg.log files
> 
> # diff -u /var/log/Xorg.0.log.old /var/log/Xorg.0.log
> --- /var/log/Xorg.0.log.old    2008-05-02 09:15:16.000000000 -0700
> +++ /var/log/Xorg.0.log    2008-05-02 09:19:10.000000000 -0700
> @@ -409,6 +409,7 @@
>  (**) NVIDIA(0): Option "RenderAccel" "True"
>  (**) NVIDIA(0): Option "NoRenderExtension" "False"
>  (**) NVIDIA(0): Option "AllowGLXWithComposite" "True"
> +(**) NVIDIA(0): Option "UseEvents" "false"
>  (**) NVIDIA(0): Option "AddARGBGLXVisuals" "True"
>  (**) NVIDIA(0): Option "DisableGLXRootClipping" "True"
>  (**) NVIDIA(0): Option "DamageEvents" "True"
> @@ -416,7 +417,7 @@
>  (II) NVIDIA(0): Support for GLX with the Damage and Composite X 
> extensions is
>  (II) NVIDIA(0):     enabled.
>  (II) NVIDIA(0): NVIDIA GPU GeForce 6150 (C51) at PCI:0:5:0 (GPU-0)
> -(--) NVIDIA(0): Memory: 262144 kBytes
> +(--) NVIDIA(0): Memory: 524288 kBytes
>  (--) NVIDIA(0): VideoBIOS: 05.51.22.33.07
>  (--) NVIDIA(0): Interlaced video modes are supported on this GPU
>  (--) NVIDIA(0): Connected display device(s) on GeForce 6150 at PCI:0:5:0:
> 
> Odd that I set it from 32M to 256M and the Xorg.log file show 256M --> 
> 512M.  What is up with that?
> 
> Rudy
> 

You probably changed AGP aperture size. I expect there is an algorithm
in the nvidia driver which calculates the 'correct' amount of VideoRam
to steal from shared memory when attaching to a shared memory graphics
card like the 6150. It is probably max(256MB, 2 * agp_aperture_size). I
could be dead wrong..

The intel driver manages shared memory in a similar way.

Tom
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