[Bug 280553] acpi_ibm brightness adjust thinkpad x260 does not work

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=280553

            Bug ID: 280553
           Summary: acpi_ibm brightness adjust thinkpad x260 does not work
           Product: Base System
           Version: 14.1-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: ea1abz@gmail.com

Hello.

I have just installed FreeBSD in a lenovo Thinkpad x260 laptop and XFCE
desktop. Congrats to the developers for this very good operating system!
Everything seems to work fine except for hotkeys.

Fn+F5 (brightness down) and Fn+F6 (brightness down) do not work. After reading
some info on internet, I arrived to the acpi_ibm man page. 

root@freebsd-x260:/home/ramiro # kldstat |grep acpi 9 1 0xffffffff82d8b000 3390
acpi_wmi.ko

root@freebsd-x260:/home/ramiro # kldload acpi_ibm
root@freebsd-x260:/home/ramiro # kldstat |grep acpi 9 1 0xffffffff82d8b000 3390
acpi_wmi.ko 26 1 0xffffffff82e85000 41e0 acpi_ibm.ko

root@freebsd-x260:/home/ramiro # sysctl dev.acpi_ibm.0.lcd_brightness
dev.acpi_ibm.0.lcd_brightness: 0

root@freebsd-x260:/home/ramiro # sysctl dev.acpi_ibm.0.lcd_brightness=7
dev.acpi_ibm.0.lcd_brightness: 0 -> 7

root@freebsd-x260:/home/ramiro # sysctl dev.acpi_ibm.0.lcd_brightness
dev.acpi_ibm.0.lcd_brightness: 7

root@freebsd-x260:/home/ramiro # sysctl dev.acpi_ibm.0.lcd_brightness=8
dev.acpi_ibm.0.lcd_brightness: 7 sysctl: dev.acpi_ibm.0.lcd_brightness=8:
Invalid argument

8 seems to be the maximum value.

But I do not see any change in screen brightness.

I have also been playing with acpi_video driver and associated sysctl variables
and it does not work:

root@freebsd-x260:/home/ramiro # kldload acpi_video

root@freebsd-x260:/home/ramiro # kldstat |grep acpi 9 1 0xffffffff82d8b000 3390
acpi_wmi.ko 26 1 0xffffffff82e85000 41e0 acpi_ibm.ko 27 1 0xffffffff82e8a000
4388 acpi_video.ko

root@freebsd-x260:/home/ramiro # sysctl hw.acpi.video.lcd0.brightness
hw.acpi.video.lcd0.brightness: 100

root@freebsd-x260:/home/ramiro # sysctl hw.acpi.video.lcd0.brightness=50
hw.acpi.video.lcd0.brightness: 100 -> 50

root@freebsd-x260:/home/ramiro # sysctl hw.acpi.video.lcd0.brightness
hw.acpi.video.lcd0.brightness: 50

root@freebsd-x260:/home/ramiro # sysctl hw.acpi.video.lcd0.brightness=10
hw.acpi.video.lcd0.brightness: 50 -> 10

root@freebsd-x260:/home/ramiro # sysctl hw.acpi.video.lcd0.brightness
hw.acpi.video.lcd0.brightness: 10

Also I do not see any change y brightness levels.

setting brightness with backlight command works just fine.

Thanks so much.

Regards.

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