Ludovic Courtès schreef op do 06-05-2021 om 23:02 [+0200]:
> Hi!
> 
> Maxime Devos <maximedevos@telenet.be> skribis:
> 
> > FWIW, the following works as expected (no error message), using the store path in .policy:
> > $ pkexec /gnu/store/zk4kb4437032swahywmgyzn55b5w5wj8-mate-power-manager-1.24.2/sbin/mate-power-backlight-helper --set-brightness=300
> > Maybe MATE is trying the equivalent of "pkexec /wrong/store/path/mate-power-backlight-helper --etcetera" instead
> > of referring to the action by name org.mate.power.backlight-helper.
> > 
> > Note the store path is different. Now try something different
> > 
> > $ which mate-power-backlight-helper
> > > /run/current-system/profile/sbin/mate-power-backlight-helper
> > $ ls -l /run/current-system/profile/sbin/mate-power-backlight-helper
> > > /gnu/store/ffqhy4xdpzkg06rlq76zrbwn8v3rqgw9-mate-1.24.1/sbin/mate-power-backlight-helper
> 
> These are different versions (1.24.2 vs. 1.24.1).
I didn't notice that. Also, this makes the problem even weirder.
Were does the version mismatch come from?

I would try to run "guix gc --referrers /gnu/store/PATH-WITH-POWER-BACKLIGHT-HELPER"
as that might shed some light on the matter, but I don't have a lot of free time
currently, so I'm hoping someone else fixes the bug first :p.

> But that’s just two store file names; where’s the third one?

1.: Authentication is needed to run
    /gnu/store/mp33h4vqdw0scdkjj0v6c3gima9wz8lm-mate-power-manager-1.24.2/sbin/mate-power-backlight-helper [...]
2.: (in org.mate.power.policy)
    /gnu/store/zk4kb4437032swahywmgyzn55b5w5wj8-mate-power-manager-1.24.2/sbin/mate-power-backlight-helper
3.: $ ls -l /run/current-system/profile/sbin/mate-power-backlight-helper
    > /gnu/store/ffqhy4xdpzkg06rlq76zrbwn8v3rqgw9-mate-1.24.1/sbin/mate-power-backlight-helper

> Isn’t the problem that you reconfigured and so there’s now a mismatch
> between the polkit rule in effect, which expects 1.24.1 (say), and the
> version you’re running?

I've had this problem for a month, I think? I'll try to confirm / falsify
tomorrow. FWIW, I don't see any mate stuff in my use profile.

Greetings,
Maxime.