linux-fbdev-users

[Linux-fbdev-users] Few fundamental queries on fb / virtual console

[Khasim, S. <x0k...@ti...>]

Hi,

Can some one update me about the ideology behind the virtual console
handling in fbconsole layer for a 2.6 Kernel?

I noticed that in 2.6 frame buffer, the virtual consoles maintain their
attributes independently. Example, if I change the bpp on one virtual
console (16bpp to 8bpp), the other VC still remains same (16 bpp).
However in 2.4 it changes the attributes of other active Virtual
consoles too. Example, if I change the mode from 8bpp to 16 bpp on VC1,
all the other VCs mode is changed to 16bpp. Is this some thing
intentionally done in 2.6 FB?

Based on the above implementation, how is the rotation treated? If I
change the rotation degree on one of the active Virtual consoles, should
all the other active Virtual consoles be oriented in new rotation angle?
Or they should still continue with their individual rotation attribute?

Thanks

Regards,
Khasim

Re: [Linux-fbdev-users] Few fundamental queries on fb / virtual console

[Geert U. <ge...@li...>]

On Tue, 23 May 2006, Khasim, Syed wrote:
> I noticed that in 2.6 frame buffer, the virtual consoles maintain their
> attributes independently. Example, if I change the bpp on one virtual
> console (16bpp to 8bpp), the other VC still remains same (16 bpp).
> However in 2.4 it changes the attributes of other active Virtual
> consoles too. Example, if I change the mode from 8bpp to 16 bpp on VC1,
> all the other VCs mode is changed to 16bpp. Is this some thing
> intentionally done in 2.6 FB?

Strange, 2.4 is also supposed to have independent modes on different VCs.
Unless you use `fbset -a'.

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- ge...@li...

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds

Re: [Linux-fbdev-users] Few fundamental queries on fb / virtual console

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

Khasim, Syed wrote:
> Hi,
> 
> Can some one update me about the ideology behind the virtual console
> handling in fbconsole layer for a 2.6 Kernel?
> 
> I noticed that in 2.6 frame buffer, the virtual consoles maintain their
> attributes independently. Example, if I change the bpp on one virtual
> console (16bpp to 8bpp), the other VC still remains same (16 bpp).
> However in 2.4 it changes the attributes of other active Virtual
> consoles too.

No, 2.4 can save per-console attributes too.  If this does not work
in 2.4, then it's a bug.

You can use fbset -a (or set FB_ACTIVATE_ALL flag) if you want
all vc's to acquire the attribute you just set.

> Example, if I change the mode from 8bpp to 16 bpp on VC1,
> all the other VCs mode is changed to 16bpp. Is this some thing
> intentionally done in 2.6 FB?

No, 2.4 should behave similarly.

> 
> Based on the above implementation, how is the rotation treated? If I
> change the rotation degree on one of the active Virtual consoles, should
> all the other active Virtual consoles be oriented in new rotation angle?
> Or they should still continue with their individual rotation attribute?

/sys/class/graphics/fb[n]/con_rotate - change rotation of current console
/sys/class/graphics/fb[n]/con_rotate_all - change rotation of all the consoles

Tony