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recently I switched to Ubuntu Gnome 14.10 64 bits on my laptop and I'm having some issues with the brightness. At first I couldn't change with the hotkeys, but I have already fixed it. The problem now is that the brightness is too low, but the indicator, the settings and the files in /sys/class/backlight show that it is at max.

I have dual boot with W7 so I tried starting Windows just to make sure it is not a screen problem, but in Windows it works fine.

I'm using the Nvidia 331 proprietary drivers.

Does anybody knows how to set the brightness to it's actual max? Thanks.

P.D.:My laptop is a Lenovo Ideapad Z500 with a i7-3632QM and a Nvidia GT645M.

Javier Salcedo
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  • I don't have the actual link handy, but I experienced something similar and AskUbuntu gave the advice of switching over to a different terminal window, adjusting the brightness, and switching back. Try: Press CTRL - ALT - F1 Adjust brightness up Press CTRL - ALT - F7

    does that fix it?

     – Rick Chatham Feb 11 '15 at 22:59
  • Looks like you confuse the display backlight setting with color calibration. It's very difficult to give further advice without a model number of the laptop, please [edit] your question and add the information. There are 2 possibilities here: Either someone already found a fix or you need to report the issue as a bug yourself. – LiveWireBT Feb 12 '15 at 13:15
  • @Javier: Could you please respond to the comment above? – Fabby Feb 17 '15 at 07:26
  • @RickChatham it didn't worked. Maybe it's a silly question, but, can I change the value of the file max_backlight to increase it? – Javier Salcedo Feb 18 '15 at 10:39
  • @LiveWireBT you are right I was confusing backlight brightness with colour brightness, I'm sorry. I have already edited the question with the information, I hope it will be useful. – Javier Salcedo Feb 18 '15 at 10:39
  • Yeah if it's a color brightness issue the fix I mentioned won't help. Probably best to follow @LiveWireBT's advice. – Rick Chatham Feb 19 '15 at 19:42

1 Answers1

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I found a post in the Arch Linux forums, that suggests the following kernel parameter for the Lenovo Ideapad Z500:

acpi_backlight=vendor

Please try this and give feedback if this solved your issue.

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