[Intel-gfx] External Monitor Performance

[Adam Jackson]

On Mon, 2009-11-02 at 18:50 +0100, Marc Deop i Argemí wrote:

> The thing is that I usually work on an external 21.5" monitor at 1920x1080 and 
> I thought the performance was bad although usable. The thing is that recently 
> I had to use the computer as a laptop (what'd you say?a laptop as a laptop, 
> uh? ;) ) without the external monitor, on it's LVDS (1280x800).
> 
> Well, now the things are *smooth*. And I *mean* it: even flash seems to play 
> properly! even on full screen! Kwin and compiz's effects work perfectly, no lag 
> nor artifacts present. Playing videos is really nice, 720p movies play while 
> doing some other thing doesn't make the video lag although I still cannot play 
> 1080p files :S
> 
> This is running on a Debian System, 2.9.0 driver on a kernel:
> 
> uname -a
> Linux Telperion 2.6.31-trunk-686 #1 SMP Tue Oct 13 22:34:42 UTC 2009 i686 
> GNU/Linux
> 
> Is this "behavior" expected? Having a 1920x1080 screen resolution impacts so 
> heavily on the performance? If so...is there any workaround?

1920 * 1080 = 2073600
1280 * 800  = 1024000

So, to the extent that you're bounded by memory bandwidth, yes, you
should expect rendering to be less than half as fast at 1920x1080 as at
1280x800.

- ajax
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