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

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

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.

> 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.

Thanks for your help!

Francois

On Thu, 2005-04-14 at 06:51, Antonino A. Daplas wrote:
> On Tuesday 12 April 2005 17:31, Francois wrote:
> > Dear linux-fbdev team,
> >
> > I've just compiled a new 2.6.12-rc2 kernel for my PowerMac G5. I've got
> > the following problem: I get "reversed" characters on the console if I
> > use CONFIG_FB_NVIDIA in the kernel. For instance, instead of an E, I get
> > a
> >
> > xxx
> >   x
> >  xx
> >   x
> > xxx
> >
> 
> Only characters are mirrored, and not the entire row (ie, row starts at the left
> side, and not at the right)?
> 
> Can you try fbset -accel false and see if it helps?
> 
> 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?
> 
> 
> > Switching CONFIG_FB_NVIDIA off eliminates the problem. My G5 contains a
> > GeForce FX 5200 Nvidia Card.
> 
> I think rivafb supports this particular chipset, but without acceleration.
> 
> Tony



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