Blank screen when lowering brightness on R510 (nvidia)

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Posts: 3
Joined: 26/11/2010, 0:48

Blank screen when lowering brightness on R510 (nvidia)

Postby giorgiob » 26/11/2010, 2:13

I own a Samsung R510 ASS5 (nVidia GeForce 9200M GS) running Ubuntu Maverick 10.10.

I added your repository and installed these packages:
  • easy-slow-down-manager
  • nvidia-bl-dkms (the module is not loaded at boot)
  • samsung-backlight
  • samsung-tools
  • udev (and modified 95-keyboard-force-release.rules in order to add my model)
and their dependencies of course...

This is my xorg.conf Device Section:

Code: Select all

Section "Device"
   Identifier  "Default Device"
   Driver      "nvidia"
   Option      "NoLogo" "True"
   Option      "RegistryDwords" "EnableBrightnessControl=1"

With these settings I've got all the buttons working.
Brightness has 7 levels: 0 through 7.

Now, the problem is that when I lower the brightness to "1" level the screen turns totally off (but I can still see things if I point some light on the screen) and when I raise the brightness the screen remains off. Fortunately I've found that pressing the Fn+F5 button (on/off lcd) two times the screen turns again on.

The same happens if I execute:

Code: Select all

# echo 1 > /sys/class/backlight/acpi_video0/brightness
# echo 0 > /sys/class/backlight/acpi_video0/brightness
# echo 1 > /sys/class/backlight/samsung/brightness
# echo 0 > /sys/class/backlight/samsung/brightness

??? Is there any way to eliminate the "zero" and "one" brightness levels in order to avoid such problem?

??? Is there any way to add some other brightness levels for a smoother dim?
Let's say 15 levels...

Posts: 3
Joined: 01/03/2011, 22:13

Re: Blank screen when lowering brightness on R510 (nvidia)

Postby XTC » 02/03/2011, 0:05

At the beginning I'd like to thank for great work on samsung-tools.

Using the same laptop model (R510) equipped with nvidia video card I've got exactly the same issue.

I feel like there is something wrong with backlit step values (I can't see the difference between maximum and one step lower value).
I'm using ubuntu 10.10 (64bit) with it's default gnome desktop.

I also have found that if I dimm backlit near the lowest level (in fact it's not the lowest one it's one step before) - it goes completely off.

To turn it one has do:
1. Increase backlit value (FN+up)
2. Press FN+F5 exactly 3 times

Since it's quite tricky if I lower the backlit level below 2 point (when it goes off) - I wonder if there is working solution to this.
Maybe not allowing to set such low backlit level via applet would do?
But I can't figure out how to do it.

samsung-backlight 0.13.7
samsung-tools 1.3.2
nvidia-bl-dkms 0.16.10

Best regards

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