Date: Fri, 5 Jul 2024 02:18:10 +0300 From: Anton Shepelev <anton.txt@gmail.com> To: freebsd-stable@freebsd.org Subject: Re: Need help controlling laptom display brightness via sysctl Message-ID: <20240705021810.f58cad5f961b7e5b7968e2db@gmail.com> References: <20240704010029.75608a4e49205eb38a6034be@gmail.com> <20240705005834.4c7983ea29da3af8f8e36718@gmail.com> <CAN6yY1uo%2Be6pY1H7JSyHKjjbB8O6a_UAoW=NoagzXSCc%2BHzaHQ@mail.gmail.com>
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Kevin Oberman:
> This is what I used. I have it in /etc/devd/thinkpad.conf.
>
> notify 100 {
> match "system" "ACPI";
> match "subsystem" "IBM";
> match "notify" "0x10";
> action "/usr/bin/backlight +";
> };
>
> notify 100 {
> match "system" "ACPI";
> match "subsystem" "IBM";
> match "notify" "0x11";
> action "/usr/bin/backlight -";
> };
>
> 10% changes are more reasonable than 1%. The top two
> "notify"s set the screen at 100% on AC and 40% on battery.
I fear you missed my point that HP seems to have a different
approach to these ACPI events. In ThinkPad, the up- and
down-brighness events have fixed notify codes: 0x10 and
0x11. In HP, on the other hand, the notify codes represent
the target brightness level on a 0..100 scale, so that
consequtive presses of Fn+F3 yield an arithmetical
progression of notify codes, e.g. 51,52,53 &c, which is why
the simplest solution is to subsitute the notify value into
the invocation of `backlight'.
Translating those codes into exponential changes would
require first of all to recall the previous value in order
to determine whether the current event is an increase or a
decrease. See what I mean?
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