Reduced screen light after power disappearing.

[Matthias Petermann]

Hello,

Zitat von Гуляев Гоша <gosha-necr at yandex.ru>:

> Good day!
>
> I have a laptop with FreeBSD 10-BETA4 AMD64. When the power is lost  
> it automatically reduces screen brightness. But when the power comes  
> back, the brightness does not return to a normal level. Fn +  
> BrightUP key do not help. I have no other auto power saving set up  
> except powerd_enable="yes" in /etc/rc.conf
>
> The only way to return brightness to a normal level now is to  
> reboot. How I can fix that?

You could try to kldload acpi_video.

# kldload acpi_video
# sysctl -a | grep brightness

should show up a key which you can use to set the brightness.

# sysctl hw.acpi.video.lcd0.brightness=100

For some vendors (e.g. Lenovo) there are custom modules with their own  
brightness setting keys:

# kldload acpi_ibm
# sysctl -a | grep brightness

If none of this are working, you might want to try out  
ports/sysutils/acpi_call and directly calling an ACPI method to  
increase or set the brightness. This was btw the only way it is  
working for my Lenovo X121e and E330.

Kind regards,
Matthias
-- 
Matthias Petermann <matthias at petermann-it.de> | www.petermann-it.de
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