misc/185805: Can't change brightness on Acer Aspire S3-391

[Mike]

>Number:         185805
>Category:       misc
>Synopsis:       Can't change brightness on Acer Aspire S3-391
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Wed Jan 15 17:00:00 UTC 2014
>Closed-Date:
>Last-Modified:
>Originator:     Mike
>Release:        FreeBSD-10 RC5
>Organization:
>Environment:
FreeBSD r2d2.geek.lan 10.0-RC5 FreeBSD 10.0-RC5 #0 r260430: Wed Jan  8 05:10:04 UTC 2014     root at snap.freebsd.org:/usr/obj/usr/src/sys/GENERIC  amd64

>Description:
I noticed I couldn't reduce the backlight with the laptop shortcut keys (Fn ->, Fn <- in my case).

so I tried xbacklight and get this:

xbacklight -get
No outputs have backlight property

acpi_video is loaded but doesn't make a difference and I also don't see any sysctl's that might be related to brightness or even "lcd".

I can change birghtness while in the bios screen, which is only a few secs.




>How-To-Repeat:

>Fix:


>Release-Note:
>Audit-Trail:
>Unformatted: