[parisc-linux] STI fb questions

[parisc-linux] STI fb questions

[M. Grabert]

Hi,

I have some questions regarding STI fb and Visualize-EG.

My Precisionbook obviously has a Visualize-EG with just 2MB.
So it should be able to display at least 800x600 in 24/32bit and
1024x768 in 16bit, but it refuses to do so. 'dmesg' ALWAYS shows
only 8bit colour depth regardless of the display resolution.

Obviously the standard sti=8/24 sti_font=VGA8x16 is used in the
kernel command line (according to dmesg, however it's not specified in
palo.conf).

My question is know, does STIfb also supports 16bit? How can I force
16bit and 24/32bit colour depths? What does sti=8/24 exactly mean?


Thanks, Max

RE: [parisc-linux] STI fb questions

[Joel Soete]

>So it should be able to display at least 800x600 in 24/32bit and
>1024x768 in 16bit, but it refuses to do so. 'dmesg' ALWAYS shows
>only 8bit colour depth regardless of the display resolution.
>

(may be you will find more accurate explanation on the stifb driver limits
with a search in this m-l)

>Obviously the standard sti=8/24 sti_font=VGA8x16 is used in the
>kernel command line (according to dmesg, however it's not specified in
>palo.conf).

Well if some parameters are not specified, palo take default value for those
once. 

>
>My question is know, does STIfb also supports 16bit? How can I force
>16bit and 24/32bit colour depths?

Unfortunately, it is not possible to force to use more than what dmesg announce
you (see limits) :(

> What does sti=8/24 exactly mean?
>
IIRC 8bit 24 colour depth.

Joel

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Re: [parisc-linux] STI fb questions

[Thomas Bogendoerfer]

On Wed, Apr 16, 2003 at 01:28:43PM +0100, M. Grabert wrote:
> My Precisionbook obviously has a Visualize-EG with just 2MB.
> So it should be able to display at least 800x600 in 24/32bit and
> 1024x768 in 16bit, but it refuses to do so. 'dmesg' ALWAYS shows
> only 8bit colour depth regardless of the display resolution.

Visualize-EG is 8 bit only. That's a hardware limitation.

> My question is know, does STIfb also supports 16bit? How can I force
> 16bit and 24/32bit colour depths? What does sti=8/24 exactly mean?

stifb supports 32bit, if the hardware supports it. sti=8/24 is the
hardware path taken from PDC.

Thomas.

-- 
Crap can work. Given enough thrust pigs will fly, but it's not necessary a
good idea.                                 [ Alexander Viro on linux-kernel ]

Re: [parisc-linux] color recovery

[M. Grabert]

On Wed, 16 Apr 2003, Thomas Bogendoerfer wrote:

> On Wed, Apr 16, 2003 at 01:28:43PM +0100, M. Grabert wrote:
> > My Precisionbook obviously has a Visualize-EG with just 2MB.
> > So it should be able to display at least 800x600 in 24/32bit and
> > 1024x768 in 16bit, but it refuses to do so. 'dmesg' ALWAYS shows
> > only 8bit colour depth regardless of the display resolution.
>
> Visualize-EG is 8 bit only. That's a hardware limitation.

The manual says something different/strange ... the LCD actually supports
16M colours, and so does the Visualize-EG (HP Graphitti).

... together with the fact that it just has 2MB onboard there is only
one possibility: they are referring to HP's color recovery technique.

Is there ANY way that color recovery will be supported anytime in the future?

> > My question is know, does STIfb also supports 16bit? How can I force
> > 16bit and 24/32bit colour depths? What does sti=8/24 exactly mean?
>
> stifb supports 32bit, if the hardware supports it. sti=8/24 is the
> hardware path taken from PDC.

Thanks, Max

Re: [parisc-linux] color recovery

[Michael S.Zick]

On Wednesday 16 April 2003 12:59 pm, M. Grabert wrote:
> On Wed, 16 Apr 2003, Thomas Bogendoerfer wrote:
> > On Wed, Apr 16, 2003 at 01:28:43PM +0100, M. Grabert wrote:
> > > My Precisionbook obviously has a Visualize-EG with just 2MB.
> > > So it should be able to display at least 800x600 in 24/32bit and
> > > 1024x768 in 16bit, but it refuses to do so. 'dmesg' ALWAYS shows
> > > only 8bit colour depth regardless of the display resolution.
> >
> > Visualize-EG is 8 bit only. That's a hardware limitation.
>
> The manual says something different/strange ... the LCD actually supports
> 16M colours, and so does the Visualize-EG (HP Graphitti).
>
> ... together with the fact that it just has 2MB onboard there is only
> one possibility: they are referring to HP's color recovery technique.

Yup.
>
> Is there ANY way that color recovery will be supported anytime in the
> future?

There has been a lot of mails on this list on this subject;
sorry that I don't have the pointers handy, but...

A search of the FAQ and the mailing list archive should lead you to
how others have dealt with this problem - including getting 8-bit X
to work on the machines.

Also, somewhere on the site(s) are some special X config files.
It isn't hopeless, just not pretty.

Mike