radeon, M22 X300, a pair of monitors, and maximizing resolution with good performance
alexdeucher at gmail.com
Fri Mar 28 08:57:59 PDT 2008
On Fri, Mar 28, 2008 at 9:32 AM, Thomas Vaughan <tevaughan at gmail.com> wrote:
> On Fri, Mar 28, 2008 at 2:11 AM, Michel Dänzer
> <michel at tungstengraphics.com> wrote:
> > On Fri, 2008-03-28 at 09:08 +0100, Michel Dänzer wrote:
> > > On Thu, 2008-03-27 at 21:18 -0600, Thomas Vaughan wrote:
> > > >
> > > > So I thought that I might just rotate my two monitors and make a
> > > > virtual desktop of 2400x1600.
> Just to be clear---in case anyone might be confused by my sloppy
> wording---I rotated clockwise each of the two 1600x1200 LCD panels
> attached to my docking station. Then I used 'Option "Rotate" "Left"' on
> each of them. With side-by-side monitors, each in portrait orientation
> (instead of the usual landscape orientation), my virtual desktop size
> was then 2400x1600.
accelerated rotation uses textures to rotate the desktop, so the max
size would be 2048x2048.
> Also, for anyone else in this conversation, I don't belong to the list.
> > > > The problem that I encountered, however, was of painfully slow
> > > > performance, even for ordinary 2D operations, like moving a
> > > > window. Is there any way of setting up a pair of monitors in
> > > > portrait mode with decent 2D and 3D acceleration, or is this just
> > > > not supported?
> > >
> > > I think it should be possible, but you need to make sure to use EXA
> > > instead of XAA and that you use something close to current upstream
> > > Git - xserver-xorg-video-ati from experimental may or may not fit
> > > the bill.
> I'll fetch the relevant debs from experimental with a Web browser. I'm
> an old guy who still uses dselect for package stuff, and I can never
> remember how to use apt (to "pin" or whatever) the right bits from
> I suppose that there's an Option to use in xorg.conf to enable EXA
> instead of XAA.
Option "AccelMethod" "EXA"
> > On second thought, I'm afraid this won't help as the 3D engine
> > probably only supports textures up to 2048x2048.
> Well, that would matter (hopefully) only if I actually wanted to use
> textures bigger than 2048x2048. Perhaps it would affect me if I wanted
> to use a big texture for the whole virtual desktop.
When using accelerated rotation with EXA, textures are used so the
limit applies here.
> Doesn't compiz do something like that? Although running compiz would be
> nice, I just want my screen saver and ordinary OpenGL apps to work
> without putting garbage onto the screen.
> Anyway, would it be a huge pain for me to check out the source and build
> it myself? I use cvs and subversion a lot at work, but I've never
> messed with git. Also, I do embedded programming in C at work. Is
> there a huge learning curve in coming up to speed on the source and
> build system for what Debian calls xserver-xorg-video-ati? I'm not
> opposed to playing around with it, but my time is limited enough so that
> I probably can't afford to climb a huge learning curve.
gIt is pretty easy to pick up. It's not that hard to install from git
so long as you have the needed build dependencies installed (xorg,
xserver-dev packages from your distro).
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