[SOLVED] How to change contrast on Lubuntu...

ardvark71 · 07-17-2015, 04:11 AM

Hi all...

I'm running Lubuntu 14.04 on an HP dv9830us laptop and was wondering if there was an easy way to adjust the contrast. The brightness is easily adjusted but there are no keys for the contrast, at least that I can see.

In case it helps, this is my graphics chip...

Code:

1:00.0 VGA compatible controller [0300]: NVIDIA Corporation G86M [GeForce 8600M GS] [10de:0425] (rev a1)
	Subsystem: Hewlett-Packard Company Device [103c:30cc]
	Kernel driver in use: nvidia

Thanks!

yooy · 07-17-2015, 06:13 AM

This revealed by search engine may help? http://askubuntu.com/questions/91195...creen-contrast

Please use current lubuntu version, don't stay behind..

rokytnji · 07-17-2015, 12:13 PM

I use redshift myself to adjust things automatically by my longitude and lattitude location.
http://manpages.ubuntu.com/manpages/...edshift.1.html
http://sysads.co.uk/2014/07/install-...-ubuntu-14-04/

rokytnji · 07-17-2015, 12:15 PM

Thread in AntiX may help you understand better also

http://antix.freeforums.org/redshift...ing-t4479.html

ardvark71 · 07-17-2015, 12:27 PM

Quote:

Originally Posted by yooy

Please use current lubuntu version, don't stay behind..

Thank you but I'm happy with this version, I prefer to stick with with LTS releases.

Also, thank you both for your suggestions but they're not quite what I'm looking for.

Regards...

brianL · 07-19-2015, 07:35 AM

I don't know about LXDE, but for KDE, adjusting: System Settings => Display and Monitor => Gamma, seemed to work on my Thinkpads. Contrast was a bit bland, but after tinkering with gamma, it sharpened up. Later, I found out about colour profiles, but that's another story.

ardvark71 · 07-19-2015, 08:42 AM

Quote:

Originally Posted by brianL

I don't know about LXDE, but for KDE, adjusting: System Settings => Display and Monitor => Gamma, seemed to work on my Thinkpads. Contrast was a bit bland, but after tinkering with gamma, it sharpened up. Later, I found out about colour profiles, but that's another story.

Hi...

Thank you, I will take a look at this when I get a chance.

Regards...

Shadow_7 · 07-19-2015, 06:46 PM

There's supposed to be an nvidia-config for that on nVidia chipsets. And amdcccle for ATI/AMD chipsets. For my intel a few things in /sys/class/backlight/intel_backlight/ for my intel GPU'd laptop. And various tricks with libxca or xrandr. My script of sorts to adjust for hulu's dark-ish codecs.

FILE: huluadjust.sh

Code:

#!/bin/bash

MONITOR=HDMI1
#MONITOR=eDP1

xset -dpms s noblank s noexpose
xrandr --output $MONITOR --brightness 1.02:1.02:1.02 --gamma 1.18:1.18:1.18
echo;
ZZZ=""; 
read -s -r -p press -n 1 ZZZ; 
unset ZZZ; 
echo; 
echo;
xrandr --output $MONITOR --brightness 1:1:1 --gamma 1:1:1
xset +dpms s blank s expose

There's also a --contrast setting. The value can be a single number, or 3 numbers to break out RED:GREEN:BLUE. With a value of 1 as the default / neutral setting.

ardvark71 · 07-20-2015, 02:06 AM

Quote:

Originally Posted by Shadow_7

There's supposed to be an nvidia-config for that on nVidia chipsets. And amdcccle for ATI/AMD chipsets.

Hi...

Thank you, I can take a look at this, too. Hopefully, I'll get some time tomorrow to work on the laptop, Lord willing.

Regards...

ardvark71 · 07-20-2015, 06:15 PM

Quote:

Originally Posted by Shadow_7

There's supposed to be an nvidia-config for that on nVidia chipsets.

Indeed there is. Thanks!

Thank you all for your help!

For the benefit of anyone who may have this same problem: This setting can be found in the program "Nvidia X Server Settings" program in the second from the last entry in the left hand pane (in my case, "DFP-0," yours may say something different,) under the tab "Color Correction."

If you have a Nvidia GPU and are using the Nvidia proprietary driver (not nouveau) this program, "Nvidia X Server Settings," should come installed with the driver. If not and you are using Ubuntu or one of it's derivatives (or even other distributions,) you can install the "Nvidia-Settings" package to get this program. If you do have it but do not see the setting for this, it may be that your driver version does not support the changes that can be made with a newer version. I had this happen once with the 173 driver. Once I installed 304, everything appeared and came up as it should.

Regards...