kernel 16bit graphics mode on the netwinder has no characters

Jan Rinze janrinze at
Tue Oct 30 19:10:46 EDT 2007

Hi Ralph,

> -----Original Message-----
> From: Ralph Siemsen [mailto:ralphs at]
> Sent: dinsdag 30 oktober 2007 2:17
> To: Jan Rinze
> Cc: netwinder at
> Subject: Re: kernel 16bit graphics mode on the netwinder has
> no characters
> On Sun, Oct 28, 2007 at 09:27:38PM +0100, Jan Rinze wrote:
> >
> > To switch to 16 bpp mode
> >
> > Just see what happens. :-)
> Alright, I can confirm that it works ok in 2.4.27-vrs2,
> and that it's broken for sure as of 2.6.12 and later.
> I haven't been able to compile 2.6.0 through 2.6.11
> successfully, due to toolchain issues.  I can try to
> do native compiles but that will take some time.
> Andrew's suggestion is a good one, though I'm not sure
> where to go looking.  Is it RGB_555 versus 565 mode that
> is the issue here?  Judging from how the display goes
> mostly blank (with some scattering of random pixels,
> mostly white) I would think we are dealing with something
> more than just a one-bit shift of colour information.
> -R

It is not the one-bit shift that is bugging the screen..
Let me check 2.6.11 sometime later and I will mail the results.. I seem to
recall that it worked fine (or maybe I hade patched it somehow.)

I also ported the framegrabber back then which is no longer supported in
current kernels.

Jan Rinze.

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