HEADSUP: default for hw.acpi.reset_video changed

[Eric Anholt]

On Mon, 2006-06-19 at 10:55 -0700, Nate Lawson wrote:
> I thought this would be a small change (since the default was already 
> supposed to be this way) but as usual with acpi, there is a lot of 
> variation out there.  I think it's split about 50/50 between systems 
> where enabling this feature is helpful/neutral and those that it is harmful.
> 
> The default value of the tunable/sysctl for hw.acpi.reset_video has 
> changed from 1 to 0 (off).  This means the BIOS video reset method will 
> not be called automatically on resume.  If you want the previous 
> behavior, set hw.acpi.reset_video="1" in /boot/loader.conf or 
> /etc/sysctl.conf.
> 
> If a committer could throw the 2nd paragraph in UPDATING, that would be 
> nice, thanks.

A note on reset_video from recent discussions I've had with Linux folks:

Up until recently was their reset_video equivalent (vbetool) being on or
off sounded like about a 50/50 chance of working or not either way.  But
apparently recently Linux started hooking in a reset_video from real
mode before going back to protected, and this works a lot better than
doing it with vm86.

As far as I understand, our reset_video hook in FreeBSD is done with
vm86.  If so, it might be valuable to try that method, if it might get
us something that works everywhere.

-- 
Eric Anholt                     anholt at FreeBSD.org
eric at anholt.net                 eric.anholt at intel.com
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