Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Update .Dt to reflect the fact that these drivers and man pages are
installed on more than just i386.

Move man pages out of man4.i386. Most of them are applicable to amd64
too, so, instead of descending to the i386 directory, we add some magic to
the parent Makefile.
These man pages refer to drivers that I'm aware that work on amd64. Most
likely there are more, but I'll deal with them later.

Approved by: brueffer, philip, takawata

Convert the SYNOPSIS section to look like the ones used in other driver
manpages, mention module support.

MFC after: 3 days

Fix typos and use consistent section names in manual pages:

s/SYSCTLS/SYSCTL VARIABLES/
s/TUNABLES/LOADER TUNABLES/
s/CAVEAT/CAVEATS/
s/DESCIPTION/DESCRIPTION/

Reviewed by: ru
MFC after: 3 days

Add support for video output switching. It appears no systems use HCI to
change the video output but use a separate device with a DSSX method
and a HID of "TOS6201" instead. We use a pseudo-driver to get the handle
for this object and pass it to the acpi_toshiba driver.

This is untested but seems to match the Linux Toshiba driver.

"CPU is an acronym, and as such should be spelled in all uppercase."

Pointed out by: ru

Sync manpage with code for hw.acpi.toshiba.cpu_speed sysctl.

Submitted by: Chia-liang Kao <clkao@clkao.org>
Approved by: njl (mentor)

mdoc(7) guru's glance.

Document the acpi_toshiba driver written by Hiroyuki Aizu.

Approved by: njl (mentor)