Re: [CONFIG_FB_NVIDIA] Mirrored characters on the console on a G5

[Francois <f.taiani@computer.org>]

Hi Tony,

> On Fri, 2005-04-15 at 11:07 +0800, Antonino A. Daplas wrote:

> > > If it does, this is a problem with nvidia's imageblit function which
> > > converts big-endian bitmaps to little endian?  Perhaps the help
> > > reverse_order() is not needed for your arch.  Can you comment out calls
> > > to reverse_order() in drivers/video/nvidia/nv_accel.c?
> >
> > I'll try this and I'll get back to you this the results.
> >
> 
> I'll wait, thanks.

I've compiled a new kernel with those lines commented out, and this
solves the console issue: no more mirrored characters. However the X
display is now garbled in the same way as with the ribafb driver: it
looks like some pixel columns are not used (fine vertical black lines
repeated in a regular pattern (every 4 screen pixel ?)), and the whole
screen is stretched horizontally as if an "X pixel" was represented as a
3x1 rectangle. If I move my mouse to the right border is re-appears on
the left border and as I move it it overwrites the previous pixels there
with what should be beyond the right border (as if multiple 'X pixels'
were mapped to the same location on the screen in a kind of modulo
operation). I can go through three and half whole horizontal screens
like that.

I guess this is quite fuzzy, but I don't know how to explain it better.
It looks like reverse_order is not needed for in console mode but is
needed in graphic mode. Could it make sense?

Cheers

Francois

> On Fri, 2005-04-15 at 11:07 +0800, Antonino A. Daplas wrote:
> On Friday 15 April 2005 00:52, Francois wrote:
> > Hi Tony,
> >
> > > Only characters are mirrored, and not the entire row (ie, row starts at
> > > the left side, and not at the right)?
> >
> > Only the characters (so I can't look in a mirror and have a "normal" screen
> > :-).
> >
> > > Can you try fbset -accel false and see if it helps?
> >
> > Right on the spot! I can now switch between mirrored and not mirrored.
> 
> You can also append this when you boot:
> 
> video=nvidiafb:noaccel
> 
> so you don't have to do an fbset -accel false each time.
> 
> >
> > > I think rivafb supports this particular chipset, but without
> > > acceleration.
> >
> > Actually my X display is garbled with rivafb (with which console
> > characters are fine). With fb_nvidia, X seems to work fine independently
> > of whether the acceleration is switched on or off (some screen size and
> > frequency issues needs tuning though).
> >
> > > If it does, this is a problem with nvidia's imageblit function which
> > > converts big-endian bitmaps to little endian?  Perhaps the help
> > > reverse_order() is not needed for your arch.  Can you comment out calls
> > > to reverse_order() in drivers/video/nvidia/nv_accel.c?
> >
> > I'll try this and I'll get back to you this the results.
> >
> 
> I'll wait, thanks.
> 
> Tony
> 
-- 
Dr Francois Taiani           http://www.comp.lancs.ac.uk/
Computing Department         http://ftaiani.ouvaton.org/
Lancaster University         phone: +44 (0) 1524 51 03 38
                             fax  : +44 (0) 1524 51 04 92 



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