[Savage40] Installed driver on Thinkpad T23

[Tim Roberts]

Gianluca Interlandi wrote:

>I have installed the latest snapshot of the driver for savage IXC. I was a
>bit disappointed that I had to reduce the colordepth down to 16 in order
>to turn on 3D acceleration on 1400x1050 (my savage should have 16 MB RAM). 
>Any workaround?
>
>glxgears tells me 490 fps, but optically the wheels seem to move much
>slower than without 3D accel where I get 144 fps. Why is that?
>  
>

Optical illusion.  Remember that, even though glxgears is generating 490 
frames per second, your Thinkpad screen is only being refreshed 60 times 
per second.  That means you're only seeing one out of every 8 frames.  
At 144 fps, you're seeing one out of every 3 frames.  If the sequence of 
wheel rotations were 8 frames long, for example, it would appear to be 
completely stopped at the faster rate.

It's the same effect you get when looking through a rotating fan blade 
at a flourescent light bulb.

-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.