[systemd-devel] Alienware graphics amplifier scancodes

[Greg KH]

On Wed, Jun 03, 2015 at 05:43:16PM -0500, Mario Limonciello wrote:
> Hi Greg,
> 
> On 05/28/2015 03:30 PM, Greg KH wrote:
> >On Thu, May 28, 2015 at 01:53:57PM -0500, Mario Limonciello wrote:
> >>
> >>On 05/28/2015 01:46 PM, Greg KH wrote:
> >>>>You
> >>>>>can't guarantee that there is another GPU to display things on.
> >>>Yes you can.
> >>Wait, what?  No, you can't.
> >>
> >>1) Not everyone has multiple monitors plugged into multiple GPU's.
> >True.
> >
> >>2) The system ships with a dGPU and supports an xGPU.  If you remove the
> >>dGPU from the chassis, all you have is the xGPU.  If you unplug xGPU,
> >>there's nothing left..
> >And how does other operating systems handle this?  Hint, I don't imagine
> >they reboot the box...
> >
> >greg k-h
> Sorry for taking so long to respond to this, I had clarified with HW
> marketing the expected experience on Win10 with the graphics amplifier on
> this hardware.
> Hot dock and undock is NOT supported.  User must reboot for the internal
> dGPU to be used after a surprise unplug.  If the cable was replugged after a
> surprise unplug there is no expectation that it continues to function.

So the user must trigger the reboot, the kernel isn't going to do a
shutdown automatically if the device is undocked or cable unplugged.

> If no other GPUs are on the system (such as dGPU not installed) then the
> system will need to be turned off and back on.

That sounds like some broken hardware, hotplug GPU does work on Windows,
if your drivers are written properly :)

good luck!

greg k-h