I have just acquired a new laptop with ATI-Radeon HD 6490M GPU and a screen of 1600x900.
I have installed RHEL 6.
It only works in 1024x768 resolution.
The System-Preferences-Display option only propose an unknown monitor and 2 resolutions: 1024x768 and 800x600.
There is no /etc/xorg.conf
So, I have tried to generate a xorg.conf_new with Xorg -configure :1 (as root), then copied it as : /etc/xorg.conf
But the X does not work anymore, and I have to remove this /etc/xorg.conf
I probably need to configure xorg.conf, but my knowledge is too limited for it.

Does anyone have an idea to fix my problem ?

I need millions of colors with a 1600x900 screen.

Thanks,
OkGuy

The radeon driver in RHEL 6 is too old to support that GPU. You either need to upgrade your kernel, as well as the xf86-video-ati driver package, or you need to use the proprietary driver from AMD.

Adam

Hellow
Please , anybody tell me how to increase the screen resolution in rhel 6 as I am new in this os.

0 members found this post helpful.

First, open your own thread for your own question...don't hijack someone elses thread. Second, since you're using RHEL, did you contact RedHat support, since you're paying for it, right?? RHEL isn't free...

And did you bother to type in "rhel 6 screen resolution" into Google?? Pulls up lots:
http://www.techotopia.com/index.php/...tiple_Monitors

Thanks: it solved my problem!

si cuius intersit

You do not need an xorg.conf file any more. I used to have a separate conf file for each section in xorg.conf.d, but with the current X11-xorg drivers, even that directory is empty. Everything just works. Udev and its friends find and configure everything.
I did write a bit of a script to set up the mouse buttons the way I like. Usb intellimouse explorer with 13 event parameters:

[~/bin/set.mousebuttons]
#! /bin/bash
## Called from ~/.config/autostart/mouse_buttons.desktop

export Mouse_Id="$(xinput list --short | grep Optical | awk '{ print $9 }' | awk -F"=" '{ print $2 }')"
/usr/bin/xinput set-button-map $Mouse_Id 1 2 3 4 5 6 7 2 1 10 11 12 13

[There is probably a better way to do that, but suffering from bouts of congenital indolence, as I oftentimes do, my development process stops as soon as I stumble upon something that works.]