Cannot change brightness on an Acer Aspire 5745-dg

Question

I have an acer aspire 5745dg laptop and i have also a very serious problem!!

My brightness is always at maximun and I cannot change it with the fn keys or from the power management and my battery discharging fast:/.

Thats my problem and i need your help guys!!!!In my windows partition brightness works perfectly only in ubuntu I have this serious and annoying problem!!!!Please reply to my message i'd appreciate that!

Hi, welcome to AU. Can you change the brightness from the "Screen" setting application? Search "bright" in the dash. — Jjed, Apr 27 '12 at 00:35
This question appears to be abandoned, if you are experiencing a similar issue please ask a new question with details pertaining to your problem. If you feel this question is not abandoned, please flag the question explaining that. :) — Seth, Dec 26 '12 at 00:47

score 1 · Answer 1 · answered Jul 14 '12 at 10:19

1

I also own a Acer netbook. I use

sudo setpci -s 00:02.0 F4.B=XX

where XX is your brightness level.

XX = FF for max brightness
XX = 30 my setting
XX = 00 no brightness

answered Jul 14 '12 at 10:19

RanRag

545

score 0 · Answer 2 · edited Jun 12 '20 at 14:37

0

Try this:

(Source)

Open the grub configuration file.
```
 gksudo gedit /etc/default/grub
```
Find this line GRUB_CMDLINE_LINUX="" and change it to:
```
 GRUB_CMDLINE_LINUX="acpi_osi=Linux"
```
Save the file and close the text editor.
Update Grub.
```
 sudo update-grub
```
Restart your computer and try to change the brightness.

Similar Question

"Can't Adjust Brightness on My Laptop"

edited Jun 12 '20 at 14:37

Community

1

answered Apr 26 '12 at 17:28

jamesadney

844

i tried it but nothnig happened anything else?:/ – pete-maister Apr 26 '12 at 20:48
I would look at the link I posted labeled "Can't adjust brightness on my laptop" and try the other things there. They had an Acer too. – jamesadney Apr 26 '12 at 21:10

Cannot change brightness on an Acer Aspire 5745-dg

2 Answers2

Try this:

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