Date: Fri, 16 Aug 2024 17:53:38 -0500 From: "Marc Coquand" <marc@mccd.space> To: <freebsd-acpi@freebsd.org> Subject: acpi_ibm brightness man page example not working + fix Message-ID: <D3HPEMO28LSQ.3B2FYGFSMSFDB@mccd.space>
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Hi!
Apologize in advance if I'm reporting this wrong, this is my first post
to the mailing list and my first time contributing to Freebsd. :)
I noticed that the example in the manpage for acpi_ibm, specifically for
setting up brightness was not working for me. The specific part that did
not work for me is:
+ 0x10|0x11)
+ LEVEL=3D`sysctl -n dev.acpi_${OEM}.0.lcd_brightness`
+ PERCENT=3D`${ECHO} "${BC_PRECOMMANDS} ; \
+ ${LEVEL} / ${MAX_LCD_BRIGHTNESS} * 100" |\
+ ${CALC} | ${CUT} -d . -f 1`
+ MESSAGE=3D"brightness level ${PERCENT}%"
+ ;;
+
This was tested on my Thinkpad T480s. It makes sense that it would not
work, because manually changing the brightness with `sysctl
dev.acpi_ibm.0.lcd_brightness=3DXXX` did not do anything either on my
laptop.
Since FreeBSD 13.0, there is a new backlight utility, and with that I
was able to fix backlight on my computer by simply creating the
following devd config:
/etc/devd/acpi_ibm_brightness.conf
+ notify 20 {
+ match "system" "ACPI";
+ match "subsystem" "IBM";
+ match "notify" "0x10";
+ action "/usr/bin/backlight incr 10";
+ };
+
+ notify 20 {
+ match "system" "ACPI";
+ match "subsystem" "IBM";
+ match "notify" "0x11";
+ action "/usr/bin/backlight decr 10";
+ };
Maybe the examples in acpi_ibm manpages should use backlight utility
instead?
Alternatively, maybe the devd rules above could be added by default so
that backlight works out of the box if you load acpi_ibm? It'd be easy
to also add support for volume control with mixer. I am happy to make a
patch if this is of interest.
Sincerely,
Marc
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