After a way to much home office, I got myself out of that cave and are blinded by the brightness of the world. At least in comparison to my screen.
How can I manually set the display brightness?
When I plug into a power cord the display jumps to a high brightness.
When I start with a power cord plugged in, the display is dimmed.
When I replug a power cord after starting with it plugged in or not, the display jumps to a higher brightness.
This happens with and with out an X server.
I guess it is not supprising that `xrandr --output eDP-1 --brightness ${B}`
Oversaturates the whites for `B` > 1 and goes more dim for `B` < 1.
Setting
```
sysctl Ahw.i915kms.enable_dpcd_backlight=1
```
did also not change anything apparent.
While the manual has `acpi_video(4)`, I find no such entry with
```
sysctl hw.acpi | grep video
```
On a thinkpad T470p with FreeBSD 13.0-RELEASE FreeBSD 13.0-RELEASE #21 r369549M.
With some power savings one as in `/etc/rc.conf`:
```
powerd_enable="YES"
powerd_flags="-a hiadaptive -b adaptive"
performance_cx_lowest="Cmax"
economy_cx_lowest="Cmax"
```
Any suggestions are very welcome!
Just realized I wort this all with markdown. Will convert to the forum syntax as soon as I am in a dark enough place again! Have mercy!
How can I manually set the display brightness?
When I plug into a power cord the display jumps to a high brightness.
When I start with a power cord plugged in, the display is dimmed.
When I replug a power cord after starting with it plugged in or not, the display jumps to a higher brightness.
This happens with and with out an X server.
I guess it is not supprising that `xrandr --output eDP-1 --brightness ${B}`
Oversaturates the whites for `B` > 1 and goes more dim for `B` < 1.
Setting
```
sysctl Ahw.i915kms.enable_dpcd_backlight=1
```
did also not change anything apparent.
While the manual has `acpi_video(4)`, I find no such entry with
```
sysctl hw.acpi | grep video
```
On a thinkpad T470p with FreeBSD 13.0-RELEASE FreeBSD 13.0-RELEASE #21 r369549M.
With some power savings one as in `/etc/rc.conf`:
```
powerd_enable="YES"
powerd_flags="-a hiadaptive -b adaptive"
performance_cx_lowest="Cmax"
economy_cx_lowest="Cmax"
```
Any suggestions are very welcome!
Just realized I wort this all with markdown. Will convert to the forum syntax as soon as I am in a dark enough place again! Have mercy!