[systemd-devel] Suspend from wireless keyboard not working

[Gustavo De Nardin (spuk)]

* Jan Alexander Steffens <jan.steffens at gmail.com> [2015-02-14 06:02 +0100]:
> On Sat, Feb 14, 2015 at 5:34 AM, Gustavo De Nardin (spuk)
> <gustavodn at gmail.com> wrote:
> > Excuse the ignorance, but why is it a problem if every keyboard would get
> > the 'power-switch' tag (or if it wouldn't be needed)? For example, would it
> > be a problem if a distro adds the power-switch tag to all keyboards by
> > default? If the kernel is in a sleep state, how would it matter to filter
> > such events? Or is the idea for it to be able to filter such events
> > immediately after being awoken and then get back to the sleep state?
> 
> Not "wakeup" from the system sleeping, but the logind process
> sleeping. To react to power key presses, logind has to process every
> keypress and filter for the right keys itself. This is why it only
> listens to special "keyboards" with a limited number of keys. If it
> would listen to all keyboards, the logind process would have to do
> work on every keypress from the user, even though if only cares about
> a vanishingly small fraction of them. Lennart would like the kernel to
> do the filtering before sending the presses to logind to avoid the
> overhead.

Got it. Thanks.

-- 
Gustavo De Nardin