Skip to main content
Start a Conversation

Unsolved

This post is more than 5 years old

hbarcc

2 Posts

11397

May 4th, 2008 16:00

Monitor brightness controls on XPS M1330

I have just received my XPS M1330 preloaded with Ubuntu.  Most of the Fn-key bindings seem to work alright, but I'm having issues with the up/down arrows controlling the monitor brightness.  The keys are indeed changing the brightness but I have an interesting issue.....using 'lshal -m' I can monitor the keybindings, and pressing Fn-(up arrow) ONCE while doing this, I see

 

13:56:17.581: platform_i8042_i8042_KBD_port_logicaldev_input condition ButtonPressed = brightness-up
13:56:17.585: computer_logicaldev_input_1 condition ButtonPressed = brightness-up
13:56:17.585: computer_logicaldev_input condition ButtonPressed = brightness-up
13:56:17.820: platform_i8042_i8042_KBD_port_logicaldev_input condition ButtonPressed = brightness-up

 

 and the brightness changes by four steps.  It doesn't seem to be a matter of pressing the key quickly or lightly, and the other Fn keys (eg. battery) work normally.

 

I can change the monitor brightness in one-step increments only by editing /proc/acpi/video/VID/LCD/brightness manually, but this is annoying.

Benoit Favre

7 Posts

May 4th, 2008 19:00

one solution is to unload the "video" module (blacklist it in /etc/modules.d). but it's no definite solution.

dasunst3r

80 Posts

May 8th, 2008 01:00

This solution worked for me, but the procedure is actually thus:


  1. Open up the terminal: Applications -> Accessories -> Terminal.
  2. Issue the command sudo nano /etc/modprobe.d/blacklist -- This will open a text editor.
  3. At the end of the file, append a line that says blacklist video
  4. Press Ctrl+O, then Enter to save the file, and then Ctrl+X to exit.
  5. Restart

 

hbarcc

2 Posts

May 8th, 2008 02:00

Fair enough; I have no idea what the ambiguous "video" module does, but removing it seems to fix this problem.

Benoit Favre

7 Posts

May 8th, 2008 02:00

the video module provides brightness control in /proc/acpi/brightness or something. then, HAL gets the Fn-Up/Down keystrokes and changes brightness. That's fine, but it happens that the bios also changes brightness when those keystrokes occur, doubling the modification...

Was this post helpful?

View All

0 events found

No Events found!

Top