[Librem-5-dev] Power management issues

[Benjamin Berg]

Hi,

On Tue, 2018-10-23 at 10:23 +0200, Guido Günther wrote:
> On Mon, Oct 22, 2018 at 10:29:58AM +0200, Benjamin Berg via Librem-5-dev wrote:
> > Hrm, kill switches. What about
> >   https://bugzilla.gnome.org/show_bug.cgi?id=761051
> 
> Yeah I think we'll hit this and it even gets a bit more complex since
> the hardware kill switches are (AFAIK) not known to the rfkill framework
> in the kernel when switched off since they get "unplugged" so we might
> need to teach g-s-d to read devices that might be there (switched on) or
> not (switched off). This could be parsed from /sys though. I know better
> how this all behaves in a couple of days and will then file bugs to move
> the discussion over (this also affects laptops with hardware kill
> switches).

Hm, it depends on what you can detect in the hardware and how you hook
things up.

We already have a similar situation on Lenovo with the bluetooth
switch. There we have a "thinkpad_acpi" rfkill switch, which is only
in-hardware. If this switch is enabled, the USB bluetooth dongle
disappears completely.

So, I think in your case a similar approach would be sensible. Assuming
you can detect the switch state, you simply export it as an rfkill
hardware switch in your platform driver, and things should work
correctly at least in theory.

Benjamin
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