Re: Call for Foundation-supported Project Ideas

On Tue, 4 Jan 2022 08:14:23 +0100
Stefan Blachmann <sblachmann@gmail.com> wrote:

> On 1/4/22, Warner Losh <imp@bsdimp.com> wrote:
> > Not without loading the xorg graphics stuff... graphics chips from the last
> > 15 or 20 years have lots of chip specific state that only the graphics
> > stuff knows about... IIRC, it only knows about it because it put the
> > graphics into a known state... it's the main reason laptops stopped
> > suspending in the early 2000s... it looks to be a lot of work for a
> > relatively rare use case...
> 
> UEFI GOP seems to have the necessary functionalities
> (https://wiki.osdev.org/GOP#Get_the_Current_Mode) so I guess the work
> required would be limited (restore mode and redraw screen from
> buffer).

 ?
 You can't get or set the mode after ExitBootService in UEFI, you only
have the framebuffer setup by the firmware.

> With non-UEFI or old UGA UEFI implementations possibly one could use
> the dual BIOS´ CSM part. Just call the CSM BIOS init to set up GPU and
> the int 10h interface, and then set previously used mode+redraw.
> BTW, doing that also could both enable vt(4) to change
> modes/resolutions and using sc on UEFI computers.

 UGA have nothing to do with having CSM.
 Also I'm unsure if INT 10 would work when booted in UEFI, i.e. I don't
think that the firmware will setup the handler in non-CSM mode.

> But I think you are right, there are probably not too many users who
> would make use of that.
> 
> 
> On 1/4/22, Warner Losh <imp@bsdimp.com> wrote:
> > On Mon, Jan 3, 2022, 11:03 PM Stefan Blachmann <sblachmann@gmail.com>
> > wrote:
> >
> >> Implementing S3 suspend/resume was a sponsored project itself.
> >> However, it still does only work when at xorg graphics mode, which
> >> already was topic in this thread.
> >> When using it from console, no matter sc or vt, it still hangs with
> >> dark screen and unresponsive keyboard.
> >> Could finishing the suspend/resume work be sponsored, so that it also
> >> works on console-only computers?
> >>
> >
> > Not without loading the xorg graphics stuff... graphics chips from the last
> > 15 or 20 years have lots of chip specific state that only the graphics
> > stuff knows about... IIRC, it only knows about it because it put the
> > graphics into a known state... it's the main reason laptops stopped
> > suspending in the early 2000s... it looks to be a lot of work for a
> > relatively rare use case...
> >
> > Warner
> >
> >
> >> On 12/30/21, Joseph Mingrone <jrm@freebsd.org> wrote:
> >> > On Thu, 2021-12-30 at 14:15, Joseph Mingrone <jrm@FreeBSD.org> wrote:
> >> >
> >> >> On Thu, 2021-12-30 at 08:05, Özkan KIRIK <ozkan.kirik@gmail.com>
> >> >> wrote:
> >> >>> I've ideas about enhancing the routing architecture. Is it possible
> >> >>> to
> >> >>> add to wiki?
> >> >
> >> >> Certainly.  Please do.
> >> >
> >> > The link again is https://wiki.freebsd.org/2021FoundationCFI
> >> >
> >>
> >>
> >
> 


-- 
Emmanuel Vadot <manu@bidouilliste.com> <manu@FreeBSD.org>