On Fri, 14 May 2010, Linus Torvalds wrote:
On Fri, 14 May 2010, Matthew Garrett wrote:
I've done some experimentation under qemu. On ACPI systems, Windows will
*only* touch the keyboard controller if there's a device with an
appropriate PNP HID or CID and if _STA evaluates to 0x0b or 0x0f.
Otherwise it'll simply ignore the hardware entirely. By the looks of it
their keyboard probing is also somewhat different to ours, but that's
probably another story.
Well, I'd hate to lose the keyboard hotplug capability, but at the same
time, it _is_ 2010, and while I have personally used it historically, I
don't really foresee ever using it again.
this is actually fairly common in datacenter environments where people
plug in crash carts to problem machines.
yes, everything has USB ports, so they could use USB keyboards, but it's
actually pretty common to still use PS/2 keyboards (and while the systems
all support USB, it's not uncommon to have KVM systems, including pretty
expensive 'enterprise' KVM systems that still require PS/2 keyboards be
used to plug into the KVM, so those are the keyboards that are in the
datacenter that someone will grab to plug into a problem machine)
David Lang
--
To unsubscribe from this list: send the line "unsubscribe linux-input" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
