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SubjectRe: [Linux-fbdev-devel] [RFC] fbdev & power management
On Wed, 14 Mar 2001, James Simmons wrote:
> >>So the fbdev drivers would register PM with fbcon, not PCI, correct?
> >
> >Either that, or the fbdev would register with PCI (or whatever), _and_
> >fbcon would too independently. In that scenario, fbcon would only handle
> >things like disabling the cursor timer, while fbdev's would handle HW
> >issues. THe only problem is for fbcon to know that a given fbdev is
> >asleep, this could be an exported per-fbdev flag, an error code, or
> >whatever. In this case, fbcon can either buffer text input, or fallback
> >to the cfb working on the backed up fb image (that last thing can be
> >handled entirely within the fbdev I guess).

[...]

> As for fbcon knowing when it is asleep. Hum. We could have a flags to
> tell it to have text data updates to be placed in the shadow buffer
> (struct vc_datas->vc_screenbuffer) only;

Very simple to implement in the fbdev itself: just replace the drawing ops by
dummy drawing ops.

This can already be done now, by providing a dummy struct display_switch, and
in the future by providing dummy accels.

Gr{oetje,eeting}s,

Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

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

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