title: nvidia on linux gamma correction link: https://onemoretech.wordpress.com/2007/05/29/nvidia-on-linux-gamma-correction/ author: lembobro description: post_id: 703 created: 2007/05/29 19:31:00 created_gmt: 2007/05/29 19:31:00 comment_status: open post_name: nvidia-on-linux-gamma-correction status: publish post_type: post

nvidia on linux gamma correction

This is another of those “so that others might not suffer as I did” posts.

Some time ago I swapped out the ATI cards that came with our Dell desktops at home with new ones from Nvidia. Although the performance specs on these cards are similar, the main reason for the switch was improved stability as a result of better quality drivers from Nvidia. This is especially true for Linux.

With the move up to CentOS 5 on my main workstation I’ve been working with the xorg generic “nv” driver for the last few weeks. Last night I finally decided to install the proprietary Nvidia driver, mostly because the contrast on my Dell flat panel was annoying me to no end.

Installation of the latest binary package went smoothly, but when I fired up the Nvidia config tool (nvidia-settings), I could not find the panel to adjust brightness, contrast or gamma.

Over the next few hours, until around 2 AM, I kept at it. Googling around to no avail. Then I noticed that xvinfo was returning squat, which mean that xv wasn’t loading. Since the xorg.conf that anaconda built during the original CentOS setup was pretty sparse (it only had “Load glx”).

Anyway, I discovered that by adding “Load extmod” xv came up and at the same time the controls for brightness, contrast and gamma now magically appeared in the Nvidia gui. I also put in Load lines for dbe, type1 and freetype.

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