linux-fbdev-users

[Linux-fbdev-users] Help with 800x480 Framebuffer (16 bit color or less)

[Lan U. <ob...@am...>]

Hello,

I'm the proud owner of a Toshiba Libretto 100CT sub
laptop that has an 800x480 LCD screen.  I'm using the
2.6.16 kernel.  I'd like to enable bootsplash on this
machine but need a 16 bit or less framebuffer to do
so.

I found the 24 bit framebuffer mode of vga=806 but I'm
unable to figure out a 16 bit (or less) mode that for
the 800x480 resolution.

Is there a full list of modes that someone could refer
me to or is there another way to "discover" the
correct vga= number that will enable 800x480 at 16 bit
color or less?

Thanks much in advance,

Patrick.

Re: [Linux-fbdev-users] Help with 800x480 Framebuffer (16 bit color or less)

[Nathanael D. N. <nat...@gn...>]

On Sat, 2006-03-25 at 15:51 -0800, Lan User wrote:
> Hello,
> 
> I'm the proud owner of a Toshiba Libretto 100CT sub
> laptop that has an 800x480 LCD screen.  I'm using the
> 2.6.16 kernel.  I'd like to enable bootsplash on this
> machine but need a 16 bit or less framebuffer to do
> so.
> 
> I found the 24 bit framebuffer mode of vga=806 but I'm
> unable to figure out a 16 bit (or less) mode that for
> the 800x480 resolution.
> 
> Is there a full list of modes that someone could refer
> me to or is there another way to "discover" the
> correct vga= number that will enable 800x480 at 16 bit
> color or less?
> 
> Thanks much in advance,

I remember using video=tridentfb,mode=1024x768@16 as kernel boot
parameter... Not sure if the above is fully correct, but google should
clear that up if it isn't.

Re: [Linux-fbdev-users] Help with 800x480 Framebuffer (16 bit color or less)

[Lan U. <ob...@am...>]

--- "Nathanael D. Noblet" <nat...@gn...> wrote:
> On Sat, 2006-03-25 at 15:51 -0800, Lan User wrote:
> > Hello,
> > machine but need a 16 bit or less framebuffer to
> > I found the 24 bit framebuffer mode of vga=806 but
> > unable to figure out a 16 bit (or less) mode that
> > the 800x480 resolution.
> > Is there a full list of modes that someone could
> > me to or is there another way to "discover" the
> > correct vga= number that will enable 800x480 at 16
> > Thanks much in advance,
> 
> I remember using video=tridentfb,mode=1024x768@16 as
> kernel boot
> parameter... Not sure if the above is fully correct,
> but google should
> clear that up if it isn't.
> 

I'd like to keep using the vesa driver for the
framebuffer support.  There does exist support for
800x480 with  the Neomagic driver but it isn't as fast
or good looking as vga=806 and has other artifact
related bugs, so I'd like to keep using the Vesa
driver.

I'm very curious as to how someone discovered vga=806
when it's not documented anywhere.  Maybe I coud use
the same method that someone used to discover vga=806,
to find a 16bit vesa mode.

I have also tried the append line of
"video=vesafb:800x480@16" but that has no effect.

Thanks,

Patrick.

Re: [Linux-fbdev-users] Help with 800x480 Framebuffer (16 bit color or less)

[Antonino A. D. <ad...@gm...>]

Lan User wrote:
> Hello,
> 
> I'm the proud owner of a Toshiba Libretto 100CT sub
> laptop that has an 800x480 LCD screen.  I'm using the
> 2.6.16 kernel.  I'd like to enable bootsplash on this
> machine but need a 16 bit or less framebuffer to do
> so.
> 
> I found the 24 bit framebuffer mode of vga=806 but I'm
> unable to figure out a 16 bit (or less) mode that for
> the 800x480 resolution.
> 
> Is there a full list of modes that someone could refer
> me to or is there another way to "discover" the
> correct vga= number that will enable 800x480 at 16 bit
> color or less?

Run X using the 'vesa' driver. Look at /var/log/X*.0.log.
It should contain a list of modes that the BIOS supports.
Pick the one you want, and take down the mode id (the
mode id is a 2 digit hexadecimal number).  Add 0x200 to the
mode id and use that in your vga= line.

Tony

Re: [Linux-fbdev-users] Help with 800x480 Framebuffer (16 bit color or less)

[Lan U. <ob...@am...>]

--- "Antonino A. Daplas" <ad...@gm...> wrote:
> Lan User wrote:
> > Hello,
> > I'm the proud owner of a Toshiba Libretto 100CT
> > laptop that has an 800x480 LCD screen.  I'm using
> > 2.6.16 kernel.  I'd like to enable bootsplash on
> > machine but need a 16 bit or less framebuffer to
> > I found the 24 bit framebuffer mode of vga=806 but
> > unable to figure out a 16 bit (or less) mode that
> > color or less?
> 
> Run X using the 'vesa' driver. Look at
> /var/log/X*.0.log.
> It should contain a list of modes that the BIOS
> Pick the one you want, and take down the mode id
> mode id is a 2 digit hexadecimal number).  
> Add 0x200 to the
> mode id and use that in your vga= line.
> Tony

Thank you very much Tony.

That worked beautifuly.  I found the mode 127 in the
Xorg.log file, added 200 and ouila with vga=0x327 I
was  able to boot with an 800x480 16 bit framebuffer
console and was also able to enable bootsplash.

I converted 0x327 to decimal and vga=807 worked too. 
I could have sworn that I tried 807 before but I must
not have.

Anywho, thank you very much Tony and thanks gooes out
to all the people who have worked on the framebuffer
project.

Patrick.