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!

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

555

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.

Cannot change brightness on an Acer Aspire 5745-dg

2 Answers2

Try this:

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