Bug#542701: xserver-xorg-video-intel: Very slow 2D performance on one screen of dual display until after switch to console VT and back.
On Thu, Aug 20, 2009 at 4:45 PM, Brice Goglin<Brice.Goglin@ens-lyon.org>
wrote:
>
> What happens if you swap monitors' positions? Does the slowness follow
> TMDS?
No.
That is, when I leave everything unchanged in 'xorg.conf' except for
changing "RightOf" to "LeftOf" in the Monitor section for what was the
right monitor, the initial sluggishness moves to the VGA output.
So when the X server fires up, whichever output is designated as being
on the right is the one that is slow for window dragging, etc.
Again, switching to a console VT and back clears up the problem.
> By the way, it looks like you're getting a 3200x1200 virtual screen.
Yes, I am, and this started working only recently. Aside from the
initial sluggishness on the right screen, however, I've seen no problem
whatsoever.
> It may be larger 3D coordinates than what your board supports IIRC.
I don't know if this be a good test, but I just ran glxgears, and I'm
getting no corruption on either screen, and I get about 300 FPS with
glxgears maximized on either screen.
> Does it help if you reduce both monitors' resolution to 1024x768
> instead of 1600x1200 ?
Are you wondering whether it helps the initial 2D sluggishness?
I don't know yet, but I'll try the experiment at some point and get back
to you.
By the way, thank you very much for taking the time to investigate
this with me.
--
Thomas E. Vaughan
There are only two kinds of people; those who accept dogma and know it,
and those who accept dogma and don't know it. - G.K. Chesterton
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