intel driver not powerfull enough for 1080p video?

Krzysztof Halasa khc at
Tue Sep 25 12:56:36 PDT 2007


"Alwin Bakkenes" <alwin at> writes:

> I simply don't get the performance I need and cannot find errors in my
> XOrg.0.log. When playing a simple mpeg2 based video through DVB-T my image
> is bad, lagging in some areas especially with panning pictures, but my CPU
> (an Intel 6850) is at 10% . 

Perhaps you are using 3D overlay and there is no sync to vertical
refresh? You may want to check with xvinfo, something like:
$ xvinfo 
X-Video Extension version 2.2
screen #0
  Adaptor #0: "Intel(R) Textured Video"
    number of ports: 16
    port base: 57
    operations supported: PutImage 
  Adaptor #1: "Intel(R) Video Overlay"
    number of ports: 1
    port base: 73

Not sure what G33 is and if it contains 2D overlay, but it may be

> Some metrics: using glxgears I get 1776 FPS, is this any good for 3D? 

glxgears is not a good benchmark, but yes, it means accelerated.

> As you can see in my Xorg.0.log, the 1080p video modes available are 50Hz
> and 24Hz. Both should be non-interlaced but at 50Hz, I see a lot of
> interlacing in mouse movements for example.

The driver doesn't support interlacing at all (not counting my private
hacks for RGB SDTV), so you just can't get interlaced output from

Perhaps your TV does something to it? Or the lack of sync between
3D overlay and vertical refresh.
Krzysztof Halasa

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