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 Forum index » Advanced Topics » Hardware
How to control laptop LCD screen backlight? (Solved, plus)
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giiba

Joined: 11 Sep 2006
Posts: 34

PostPosted: Tue 26 Sep 2006, 23:32    Post subject:  How to control laptop LCD screen backlight? (Solved, plus)  

So, I've spent much time over the last two weeks (30+ hours) trying to get puppy to control the LCB backlight of my laptop screen. It is currently at max brightness and there is nothing I can figure to do. I have:

-added modules: LCD, backlight, video
-compiled and installed hotkeys and acpid as per instructions here: http://www.da-cha.org/letsnote/
-compiled and installed pcc_acpi module (same link)
-installed updated Berkeley DB (3.2.9) to support hotkeys

all of this compiles and runs fine, just nothing happens to my screen brightness.

Has anyone else been able to alter the screen brightness on their laptop? I do not necessarily need to have my hotkeys working, but running at full brightness dramatically reduces my battery life. Also, when I leave my lid open, puppy will blank the screen but it is obvious that the backlight is still on. I'm a linux newbie so I could be over-looking something simple. Please help. I'm running puppyoffice 2.02.
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giiba

Joined: 11 Sep 2006
Posts: 34

PostPosted: Wed 27 Sep 2006, 12:20    Post subject:  

I solved my problem... it turns out that in my haste I copied the 'template' files over the real files in /etc/acpi. Once I reloaded the actual script, surprise, everything works. Even things I wasn't expecting to have work; my sound is now working, hoorah!

I had given up on the sound system, figuring that it was some weird bug that prevented it from working. However upon messing around in the /proc/acpi/pcc, the speaker "clicked" as I toggled the mute function. To my joy when I loaded http://www.weebls-stuff.com/toons/kenya/ (my favorite test for computer functioning) I was greeted by full sound for the first time in linux. After digging around in the scripts, I found the configuration area and now all is working.... and what's this? My laptop never sounded this good. Under Windows XP the sound was crackly at med-high volumes... under linux the sound is clear and very good until very high volumes.

the conlusion: Linux sounds better Laughing
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meckelman

Joined: 28 Sep 2006
Posts: 4
Location: Colorado, USA

PostPosted: Sat 03 Aug 2013, 08:40    Post subject:  

Brightness backlight control For Precise 5.7 on a laptop.

Code:
xrandr --output LVDS --brightness .7


I guess .7 ~= 70% brightness.
Just run xrandr solo to see the output devices you can control.
xbacklight didn't work. It worked on Precise 5.6, but not 5.7.1.
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