28.05.2015 01:59, Mario Limonciello wrote:
Hi,
Some Alienware notebooks and desktops support an external graphics
housing called the "Alienware Graphics Amplifier". It allows the usage
of a larger or more modern graphics card than your gaming PC would
already support. In order to provide a good experience, systems that
support it can provide notification to the OS via the scancodes on the
the keyboard controller of events related to the cable.
The following 4 events are supported (and the presumed OS response):
* Cable plugged in (An app on the existing display or terminal would
tell the user to reboot the system to activate)
* Undock cable pressed (An app would let the user know to reboot the
system to complete undock process; also when supported by GFX driver,
driver can clean up and work without a reboot)
* Undock hotkey pressed (Same result as undock cable expected)
* Surprise removal of cable (System immediately reboots).
OK, so you have described GPU hotplug in detail. Please note that
Alienware is not the only system that has a hot-pluggable GPU. My
laptop, Sony VAIO VPC-Z23A4R, manufactured in 2012, also has a similar
facility (the AMD GPU, including two additional outputs, is in the
docking station), but AFAIK it is not based on scancodes. So maybe it
makes sense to unify handling of the "Undock" buttons on these devices.
Feel free to contact me via email or XMPP (same address) so that we can
figure out how to make this possible.
P.S. Under Windows 7, if the dock station is configured to be used for
additional outputs only, it handles both docking and undocking without a
reboot.
--
Alexander E. Patrakov
_______________________________________________
systemd-devel mailing list
[email protected]
http://lists.freedesktop.org/mailman/listinfo/systemd-devel
