On Thu, Jan 11, 2024 at 08:53:46AM +0000, Rodolfo Medina wrote: > As my machine has a dual boot with MS Windows, F2 and F3 keyboard keys work > fine in Windows in lowering and increasing sound volume, and F1 for muting it > etcetera F4, F5, F6..., but in Debian they don't seem to work.
"In Debian" is a wide land :-)
OT1H...
A week ago I installed Debian's Bookworm with MATE on a friend's computer
(Thinkpad x270) and the loudness keys worked out of the box.
OTOH...
Myself -- I have no desktop environment (fvwm on X, *no* systemd, *no*
DBUS, so that would count as "exotic guy").
On my laptop (a Thinkpad x230) the background brightness wasn't working
(I don't know about the loudness things, since I never needed/used them).
Therefore I decided to catch ACPI events and set up this:
--- ---
tomas@trotzki:~$ cat /etc/acpi/events/briteup
event=video/brightnessup
action=/etc/acpi/actions/brite "%e"
--- ---
tomas@trotzki:~$ cat /etc/acpi/events/britedn
event=video/brightnessdown
action=/etc/acpi/actions/brite "%e"
--- ---
tomas@trotzki:~$ cat /etc/acpi/actions/brite
#!/bin/sh
logger "[ACPI] $@"
BASE="/sys/class/backlight/intel_backlight"
CURR=$(cat "$BASE/brightness")
MAX=$(cat "$BASE/max_brightness")
# MIN is some arbitrary "low" value. Note that for values
# of MIN below 6 (more precisely: 2/11 for our factor), the
# thing gets stuck at the low end: (13 * x) / 11 == x,
# in integer arithmetic, for x <= 5.
#
# The "exponential" algorithm is a bit long at the low
# end. We might consider stretching there. Or increasing
# MIN.
MIN=20
if [ "$CURR" -lt "$MIN" ] ; then CURR="$MIN" ; fi
# NOTE: 11/13 is approx the fourth root of 1/2:
# i.e. four steps are a doubling/halving
# of brightness (constant steps gave too
# coarse jumps in the low range)
case $1 in
video/brightnessdown* )
NEW=$(( (11 * CURR) / 13 ))
;;
video/brightnessup* )
NEW=$(( (13 * CURR) / 11 ))
;;
* )
exit 0
;;
esac
if [ "$NEW" -lt "$MIN" ] ; then NEW="$MIN" ; fi
if [ "$NEW" -gt "$MAX" ] ; then NEW="$MAX" ; fi
logger "[ACPI] brightness $CURR --> $NEW"
echo "$NEW" > $BASE/brightness
--- ---
(The charm of using ACPI is that it works independently of X).
To find which events to wait on, just run acpi_listen on a
terminal and hit your dream's key.
> Please help who can, thanks in advance.
The appropriate medication will depend on your microbiome ;-)
Cheers
--
t
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