Question

3

Screen brightness is either totally dim or totally max on a Samsung NP350 Laptop

rated 0 times [ 3] [ 0] / answers: 1 / hits: 4003 / 2 Years ago, sat, january 29, 2022, 5:56:44

I updated my Ubuntu 12.04 last night to the latest packages.

When I tried to change brightness using Fn Key this morning, brightness went all the way to either min or max brightness. I was not able to set brightness to anywhere in between.

I thought the update may have broken Fn Key, then I tried using the slide in Brightness and Lock screen in system settings. But when I have Brightness and Lock opened, brightness is locked to min brightness no matter I use the slide or Fn key.

P.S. I had no problem with brightness before yesterday.

My hardware is Samsung NP350 Laptop with Intel HD3000.

Thanks

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answered 2 Years ago igeonlothe · Accepted Answer

I had the same issue, and was able to solve it as follows. In a Terminal (Ctrl+Alt+T) I ran:

cd /etc/modprobe.d

I looked to see what files the /etc/modprobe.d directory contained:

porsche@porsche-300V3A-300V4A-300V5A-200A4B-200A5B:/etc/modprobe.d$ ls -la

total 52

drwxr-xr-x   2 root root  4096 Aug  4 00:33 .

drwxr-xr-x 131 root root 12288 Aug  4 00:54 ..

-rw-r--r--   1 root root  2507 Feb 15 21:03 alsa-base.conf

-rw-r--r--   1 root root   325 Mar 18  2011 blacklist-ath_pci.conf

-rw-r--r--   1 root root  1656 Aug  4 00:33 blacklist.conf

-rw-r--r--   1 root root   210 Mar 18  2011 blacklist-firewire.conf

-rw-r--r--   1 root root   661 Nov 20  2011 blacklist-framebuffer.conf

-rw-r--r--   1 root root   156 Feb 15 21:03 blacklist-modem.conf

lrwxrwxrwx   1 root root    41 Jul 31 13:04 blacklist-oss.conf -> /lib/linux-sound-base/noOSS.modprobe.conf

-rw-r--r--   1 root root   583 Mar 18  2011 blacklist-rare-network.conf

-rw-r--r--   1 root root  1077 Mar 18  2011 blacklist-watchdog.conf

-rw-r--r--   1 root root    30 May 18 03:03 vmwgfx-fbdev.conf

porsche@porsche-300V3A-300V4A-300V5A-200A4B-200A5B:/etc/modprobe.d$ 

porsche@porsche-300V3A-300V4A-300V5A-200A4B-200A5B:/etc/modprobe.d$

So I edited blacklist.conf by running sudo vi blacklist.conf. (You can also use sudo nano -w blacklist.conf or gksu gedit blacklist.conf.)

I added the following lines to blacklist.conf:

blacklist samsung_laptop

blacklist samsung_backlight

Then I saved the file, and quit the text editor. Afterwards, I applied:

sudo apt-get update

I restarted my laptop and everything is OK right now.