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99-systemd.rules.in: guard systemd-backlight udev rules by ENABLE_BACKLIGHT

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Linux kernel will, as documented in drivers/video/backlight/backlight.c,
report changes to a backlights brightness as a uevent (ACTION=change).

systemd-udev will consume the uevent, match on this rule and try to
activate the systemd-backlight service for the backlight. BUT when
systemd is not compiled with backlight support, this will lead to
failure that is reported in the journal.

Since the failure to activate systemd-backlight and subsequent failure
log entry happens on every backlight brightness change, we found the
resulting logspam during regular operation excessive and came up with
this patch to mitigate it.

The conditional is also extended to "*kbd_backlight" match, since
even though we did not investigate to see if the logspam would be
similar, the unconditional match to activate systemd-backlight here
would also not make sense when the feature is not compiled in.

Signed-off-by: Simon Braunschmidt <simon.braunschmidt@iba-group.com>
(cherry picked from commit 99d3dd2ba7d6beb9508515cf1dae409e9da1998f)
(cherry picked from commit 0d7b88b0caef74a2068152ecde41f3ac1f5fdf20)
This commit is contained in:
Simon Braunschmidt 2023-06-05 11:49:45 +00:00 committed by Luca Boccassi
parent 00b3deebdd
commit 660391068e
1 changed files with 2 additions and 0 deletions
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rules.d/99-systemd.rules.in
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@ -65,10 +65,12 @@ SUBSYSTEM=="udc", ACTION=="add", TAG+="systemd", ENV{SYSTEMD_WANTS}+="usb-gadget
# Apply sysctl variables to network devices (and only to those) as they appear.
ACTION=="add", SUBSYSTEM=="net", KERNEL!="lo", RUN+="{{ROOTLIBEXECDIR}}/systemd-sysctl --prefix=/net/ipv4/conf/$name --prefix=/net/ipv4/neigh/$name --prefix=/net/ipv6/conf/$name --prefix=/net/ipv6/neigh/$name"
{% if ENABLE_BACKLIGHT %}
# Pull in backlight save/restore for all backlight devices and
# keyboard backlights
SUBSYSTEM=="backlight", TAG+="systemd", IMPORT{builtin}="path_id", ENV{SYSTEMD_WANTS}+="systemd-backlight@backlight:$name.service"
SUBSYSTEM=="leds", KERNEL=="*kbd_backlight", TAG+="systemd", IMPORT{builtin}="path_id", ENV{SYSTEMD_WANTS}+="systemd-backlight@leds:$name.service"
{% endif %}
# Pull in rfkill save/restore for all rfkill devices
SUBSYSTEM=="rfkill", ENV{SYSTEMD_RFKILL}="1"