Backlight on Samsung RV520

[jimmjo1987]

Hi all,

i have a Samsung rv520 with an Geforce GT 520m.
My OS is Kubuntu 12.04 Which packets i must install to controll the brigthness value?

thanks

[sergwy]

It feels like none. I have the same notebook and brightness control is broken after upgrade to 12.04. It worked perfectly in 11.10 though. Now I can only decrease the brighness.

[0052]

You need nvidia_bl module.

Google it nvidia-bl-dkms git repo and in the downloads section, download and install nvidia_bl0.74 for ubuntu 12.04.

Problem is, samsung-tools hotkeys doesn't work! You have to echo the /sys/class/backlight/nvidia_backlight/brightness file (with a range from 0 to 127).

I hope Voria will bind the echo with the hotkeys for this laptop!

[sergwy]

Thanks!
Is 0.74 version compatible with Precise? In Voria's post he said that this driver was incompatible with the kernels in 12.04.

[0052]

Well, it's compatible with archlinux with kernel 3.4.2.. I guess it's fine. In voria's repo there is a 0.73 version and it's not compatible. 0.74 fix kernel 3.2.x compilation (ubuntu kernel)

[sergwy]

Just installed it. It works. But the driver does not start automatically.
And I cannot control the brightness with FN+up/down buttons.

[0052]

Told ya hotkeys doesn't work.

Try loading nvidia_bl module at boot (MODULES in rc.conf)

[jimmjo1987]

Hi,

iam already there

I have now a clean installation of 12.04. But what should i exactly do to get the brightness work on my samsung rv520 ?

Thanks for reply

[0052]

https://github.com/guillaumezin/nvidiabl/downloads

Install the latest .deb

I don't know if the new version let the fn keys work...(I had a problem with the monitor standby with 0.73 version and uninstalled).

To change the brightness manually just do:

echo XX > /sys/class/backlight/nvidia_backlight/brightness

XX -> from 0(min) to 128(max)

[jimmjo1987]

Hi,

i have installed the deb packet. But when i try to change the brightness over the terminal, i get an error message
becaue the folder / file nvidia Backlight didnt exsist.

Have yout a idea?

[jimmjo1987]

re,
i came a step forward! now i can change the brightness with you console command. But the maximum brightness i can adjust is nit very maximum can i change the maximum an minimum values?
Because when i want to set it for example on 100 The display is in my opinion on 15 oder 20 %.


regards

[sergwy]

You neet to load the module nvidiabl with an option max_brightness = 10000

[nikkoo]

thanks for your help!