[directfb-users] Re: XDirectFB on secend head flickers

[TheNop <TheNop@gmx.net>]

Ville Syrjälä wrote:

> On Mon, Aug 09, 2004 at 09:31:03PM +0200, TheNop wrote:
>  
> > Ville Syrjälä wrote:
> >
> >    
> > > On Mon, Aug 09, 2004 at 03:49:05PM +0200, TheNop wrote:
> > >
> > >
> > >      
> > > > Hi everybody,
> > > >
> > > > I use XDirectFB on the second head (TV pal) of the Matrox G400.
> > > > The problem is, that on the tv output there is a heavy line flicker.
> > > > If there are horizontal lines on the screen the lines are jumping up an 
> > > > down.
> > > >
> > > > If  I use dfbinfo I see that the Matrox CRTC2 layer has the cap:  
> > > > flicker_filtering
> > > > Could it be possible, that the option can reduce the line flicker effect?
> > > > When yes, how can I switch it on?
> > > >  
> > > >        
> > > You can try the attached patch. It allows dfblayer to toggle the layer 
> > > options. You need to be using the multi-app core for it to work.
> > >
> > > I just tried it myself but I didn't actually see any difference in the 
> > > flicker. I remember that in Windows the difference was quite visible. So 
> > > either my eyes aren't working today or the filter doesn't work unless the 
> > > maven's scaler is used (or it requires some other magic bit to be 
> > > enabled). In windows you can't actually enable the filter when watching 
> > > videos w/ DVDMAx. It can only be enabled for normal dual head operation.
> > >
> > > So please try the patch and let me know of the results. If the filter 
> > > doesn't actually work I'll just remove it.
> > >
> > >
> > >
> > >      
> > Howcan I patch the kernel 2.4.26 for  multi-app core support?
> >    
> If you're using 0.9.20 there should be a patch included in the patches 
> directory. Even if the version of the patch doesn't match you kernel it 
> will usually work because 2.4 doesn't get big changes anymore.
>
> If you're using cvs DirectFB you can grab linux-fusion from cvs and 
> compile the module outside the kernel tree. No need to patch the kernel. 
> 0.9.20 might or might not work with linux-fusion too.
>
>  
I have tested the option FLICKER_FILTERING  but nothing happend.
I have the same line flicker effect as before. Switching on and off has 
no effect.

I  tested xfree with fbdev driver on the TV an I saw the same line 
flicker effect as using XDirectFB.
Only when I'm using the mga driver for xfree I have real stable output 
on my TV without any line flicher effect.

Any ideas?

Best regards
TheNop