Re: backlight(8) and Thinkpad special keys

On Sat, Jun 18, 2022 at 01:53:47PM +0300, Oleksandr Kryvulia wrote:
> 17.06.22 07:28, Pete Wright пише:
> > hey there,
> > i've noticed that on my lenovo thinkpad that when loading the drm-510-kmod driver
> > the my usual way of managing screen brightness via hw.acpi.video.lcd.brightness
> > does not work (the sysctl knob is not available).  when loading the drm-54-kmod
> > it is available.  while debugging this i've noticed that using both drivers i am
> > able to adjust things via the backlight(8) utility - thanks manu!
> > 
> > the one drawback with this is that it seems like acpi_ibm(4) is no longer able
> > to manage screen brightness.  i.e. i can no longer use the special brightness
> > function keys to increase/descrase screen brightness.
> > 
> > so couple questions:
> > 
> > 1. has anyone sucessfully tied their "special" keys to the backlight utility?
> > 2. if not is the best approach to map the screen brightness keys to special events
> >     via devd that would call backlight(8) directly?  my reading of the acpi_ibm
> >     man page seems to indicate it prefers to operate directly via sysctl which
> >     doesn't seem to work for me under the 5.10 drm driver.
> 
> Hi!
> On my thinkpad t490 I`m using backlight(8) with acpi_ibm(4) and devd(8).
> Here is my simple config:

Hey there Oleksandr - this worked like a charm.  Thanks for sharing your config!

-pete


-- 
Pete Wright
pete@nomadlogic.org