Restoring videomode on return from S3 sleep

Restoring videomode on return from S3 sleep

[Pavel Machek]

Hi!

I'll need to restore video mode on returning from acpi sleep...

Unfortunately, video selection code is not part of kernel, it is
16-bit code. acpi_wakeup.S, otoh, *is* part of kernel :-(. Plus, I
can't find place where video.S passes number of mode it actually
*used*.

Any ideas?
								Pavel
-- 
<sig in construction>

Re: Restoring videomode on return from S3 sleep

[James Simmons]

> Hi!
> 
> I'll need to restore video mode on returning from acpi sleep...
> 
> Unfortunately, video selection code is not part of kernel, it is
> 16-bit code. acpi_wakeup.S, otoh, *is* part of kernel :-(. 

Is this on the console and if it is I assum you are uing vgacon. It could 
be the S# card has a broken implemenation. This wouldn't be the first.
Their has been a patch sometime for vesafb to work properly with S3 cards.

S3 framebuffer anyone? I remember their has been scathered work on this
but I never seen anything come to light for this.

> Plus, I
> can't find place where video.S passes number of mode it actually
> *used*.

video.S puts information into struct screen_info which then is used later
by vgacon or vesafb. 

P.S
   I plan to make struct screen_info go away in 2.5.X. 

Re: Restoring videomode on return from S3 sleep

[Pavel Machek]

Hi!

> > I'll need to restore video mode on returning from acpi sleep...
> > 
> > Unfortunately, video selection code is not part of kernel, it is
> > 16-bit code. acpi_wakeup.S, otoh, *is* part of kernel :-(. 
> 
> Is this on the console and if it is I assum you are uing vgacon. It could 
> be the S# card has a broken implemenation. This wouldn't be the first.
> Their has been a patch sometime for vesafb to work properly with S3 cards.
> 
> S3 framebuffer anyone? I remember their has been scathered work on this
> but I never seen anything come to light for this.

Oh. Sorry. By S3 I mean ACPI S3 state. ACPI S3 == suspend to RAM.

Basically what I need is to restore video mode after returning from
ACPI S3 sleep state, so that vesafb works properly.
								Pavel
-- 
Casualities in World Trade Center: 6453 dead inside the building,
cryptography in U.S.A. and free speech in Czech Republic.

Re: Restoring videomode on return from S3 sleep

[Daniel Gryniewicz]

On Tue, 27 Nov 2001 19:16:04 +0100
Pavel Machek <pavel@suse.cz> wrote:

> Hi!
> 
> > > I'll need to restore video mode on returning from acpi sleep...
> > > 
> > > Unfortunately, video selection code is not part of kernel, it is
> > > 16-bit code. acpi_wakeup.S, otoh, *is* part of kernel :-(. 
> > 
> > Is this on the console and if it is I assum you are uing vgacon. It could 
> > be the S# card has a broken implemenation. This wouldn't be the first.
> > Their has been a patch sometime for vesafb to work properly with S3 cards.
> > 
> > S3 framebuffer anyone? I remember their has been scathered work on this
> > but I never seen anything come to light for this.
> 
> Oh. Sorry. By S3 I mean ACPI S3 state. ACPI S3 == suspend to RAM.
> 
> Basically what I need is to restore video mode after returning from
> ACPI S3 sleep state, so that vesafb works properly.
> 								Pavel

I need the same for APM. (I would prefer ACPI, but it currently hangs by box) 
I have to use vesafb or I get artifacts (Trident CyberBlade/XP), but then a
resume from APM never restores the video.  Presumably, a reset (similar to
when the fb is turned on?) would fix the problem.  I haven't looked into it
yet due to lack of time, but if someone else is going to work on it, I'll
gladly help test.

Daniel
--- 
Recursion n.:
        See Recursion.
                        -- Random Shack Data Processing Dictionary

Re: Restoring videomode on return from S3 sleep

[Pavel Machek]

Hi!

> > > > I'll need to restore video mode on returning from acpi sleep...
> > > > 
> > > > Unfortunately, video selection code is not part of kernel, it is
> > > > 16-bit code. acpi_wakeup.S, otoh, *is* part of kernel :-(. 
> > > 
> > > Is this on the console and if it is I assum you are uing vgacon. It could 
> > > be the S# card has a broken implemenation. This wouldn't be the first.
> > > Their has been a patch sometime for vesafb to work properly with S3 cards.
> > > 
> > > S3 framebuffer anyone? I remember their has been scathered work on this
> > > but I never seen anything come to light for this.
> > 
> > Oh. Sorry. By S3 I mean ACPI S3 state. ACPI S3 == suspend to RAM.
> > 
> > Basically what I need is to restore video mode after returning from
> > ACPI S3 sleep state, so that vesafb works properly.
> 
> I need the same for APM. (I would prefer ACPI, but it currently
> hangs by box) 

ACPI and APM are *very* different in this regard: in APM, you stay
protected mode, while with ACPI, you *have to* go through real mode.

> I have to use vesafb or I get artifacts (Trident CyberBlade/XP), but then a
> resume from APM never restores the video.  Presumably, a reset (similar to
> when the fb is turned on?) would fix the problem.  I haven't looked into it
> yet due to lack of time, but if someone else is going to work on it, I'll
> gladly help test.


It is going to be different from ACPI sleep support.

...or...

maybe not. vesafb with ability to go back realmode and reinit hw would
be nice -- and it would also fix your APM problem. But I doubt that's
implementable.
									Pavel
-- 
Casualities in World Trade Center: 6453 dead inside the building,
cryptography in U.S.A. and free speech in Czech Republic.