Re: [linux-pm] [PATCH] PM / i915: Skip kernel VT switch during suspend/resume if KMS is used

[Stefan Seyfried <stefan.seyfried@googlemail.com>]

On Sun, 31 Jan 2010 09:54:19 +0100
Pavel Machek <pavel@ucw.cz> wrote:

> On Thu 2010-01-28 00:07:51, Stefan Seyfried wrote:
> > Hi,
> > 
> > On Tue, 26 Jan 2010 15:58:43 +0100 Pavel Machek <pavel@ucw.cz> wrote:
> > > We need vt switch when display is controlled by userland app directly
> > > accessing hw. It may or may not be X (svgalib anyone?,
> > > gtk-on-framebuffer? qtopia?).
> > 
> > anything-on-framebuffer should not be different from plain framebuffer
> > console, or am I missing something?
> 
> It is. At least svgalib accesses hw directly. It probably can run even
> on framebuffer.

If it accesses hw directly, it's not really "anything-on-framebuffer"
anymore, is it? The framebuffer device is there to abstract the
hardware.
 
> Well, for now the "shadow buffer" contains only text, not graphics
> images. So you'd need to enlarge it a lot. Doable but more than one liner.

Yes, noticed this today. I was using bootsplash-patched kernels, which
are obviously different in this aspect, so that shifted my view on
reality ;)
-- 
Stefan Seyfried

"Any ideas, John?"
"Well, surrounding them's out."