[Pkg-utopia-maintainers] Bug#903795: more info

[Roderich Schupp]

The reason upowerd doesn't recognize keyboard backlighting anymore is
https://gitlab.freedesktop.org/upower/upower/commit/b0cdb7e9fe93b662d4f4a29b3af7f66ef3763c67
which added several filesystem lockdown directives to upower.service

In my case (Apple MacBook Air), the kbd_backlight control file are in

$ ls -l /sys/class/leds/smc::kbd_backlight
lrwxrwxrwx 1 root root 0 Aug 22 20:02 /sys/class/leds/smc::kbd_backlight ->
../../devices/platform/applesmc.768/leds/smc::kbd_backlight/

i.e. /sys/devices/platform/applesmc.768/leds/smc::kbd_backlight

I dropped the following upower.service override into /etc which made
keyboard backlight control work again:

--- /lib/systemd/system/upower.service  2018-07-05 14:07:56.000000000 +0200
+++ /etc/systemd/system/upower.service  2018-08-22 21:00:11.340079711 +0200
@@ -9,10 +9,10 @@
 Restart=on-failure

 # Filesystem lockdown
-ProtectSystem=strict
-ProtectKernelTunables=true
-ProtectControlGroups=true
-ReadWritePaths=/var/lib/upower
+#ProtectSystem=strict
+#ProtectKernelTunables=true
+#ProtectControlGroups=true
+#ReadWritePaths=/var/lib/upower
 ProtectHome=true
 PrivateTmp=true


Cheers, Roderich
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