Re: [Linux-fbdev-users] matroxfb: screen messes up after so

[Petr V. <VAN...@vc...>]

On  8 Jun 04 at 22:22, Jonas Meurer wrote:
> On 08/06/2004 Petr Vandrovec wrote:
> > I think that it is too drastic if you switched to fbdev driver. mga driver
> > with DRI disabled will be much faster.
> 
> ah, good to know. so fbdev driver should only be used for old cards
> without good xfree86 support like vesa?

It usually depends how are xfree and kernel driver willing to coexist.
I tried to make kernel matroxfb as permissing as possible, but reprogramming
accelerator every second while some drawing operation is in progress is
really too much - so you cannot use DRI with matroxfb...
 
> > > yea, then my current configuration should work. Is DRI support a
> > > recommented feature for better performance/lookout/...?
> > 
> > DRI is mainly for 3D performance.
> 
> so i'm not able to run software with 3D usage like tuxracer ,what I
> didn't manage to do anyway since my system simply freezes at running
> tuxracer 0.61, and all these nice xmms visualisation plugins that
> freezed my system too a couple of times?

You should have no crashes without DRI...
 
> By the way, why did they freeze the system? doesn't this happen any
> longer without dri support, maybe in favour of just printing an error
> message?

... ah, I see that you found it already. They do not print any message
because your system is dead. If you have computer newer than 4 years, you'll
find that you also cannot power off box by simple pressing poweroff button -
- you have to hold it 4 secs.

Why it crashes is question for XFree people. With older XFree's they
did not set up AGP properly, and did not handle IRQs from videocard right,
but with XFree 4.3 I thought that all these problems were fixed.
 
> apart from all this inferesting stuff, my monitor starts to switch
> mode(?) or at least horizontal size, what means it sometimes starts to
> jump from normal view to another mode(?) or anything. anyway: the
> vertical size of screen stays like it was but the horizontal size of
> screen switchs, and thus left and right border of screen are not seen
> any longer but cutted by the hardware-border of my monitor.
> 
> after some time of switching monitor stays in one of both view modes,
> but randomly jumps to and from from time to time.

Probably picture size you are using is just on edge where monitor makes
decision which of its preset settings it should use. If it happens on
console, try changing pixclock a bit (it is first number in 'timmings'
entry in fbset output). If it happens in XFree, change dot clock in
/etc/X11/XF86Config-4... Usually change by 1% in either direction is more
than sufficient to get rid of this switching. Unless your monitor is dying...
                                                                Petr