Defrag

[then00b]

*********************************************************************************************************************************
EDIT:  firenice03 responded before I finished and posted this.  Try that solution first -- it's easier than my instructions below, but is doing exactly the same thing.
*********************************************************************************************************************************

I don't know a lot about fixing graphic card issues, (so can't be much help with that), but I can help you reverse what you did according to that link.

Hopefully you still have the live install dvd/usb that you used to install LL.  If not, make another.

Boot computer with your live dvd/usb.

Open a terminal and enter this command to list the partitions on your hard drive.

Code:

sudo parted -l

(Command ends in a lowercase letter "L", not the number "1".)

Find your LL root partition and make note of which partition it is (eg. /dev/sda1, /dev/sda5, etc.).  Assuming you did a standard installation that results in one root partition and one swap partition, just look for the partition that shows "ext4" under the "File system" column of the output.  If you have a root/home/swap setup, you'll see two with "ext4".  The smaller of the two partitions will be the root partition in that case (unless you have a very strange setup).

Substitute your correct partition in place of my example of /dev/sdXY in the command below.  (X is the drive letter -- eg. a,b,c -- Y is the partition number -- 1,2,3.  Command will mount the root partition to the live environment so you can get to the file you made from that tutorial.

Code:

sudo mount /dev/sdXY /mnt

Now we'll just delete the file you made in tutorial so it doesn't get used on further boots.  Enter this command to do that.

Code:

sudo rm /mnt/etc/X11/xorg.conf.d/20-amd.conf

Now unmount the partition with this command.

Code:

sudo umount /mnt

Shutdown, remove live dvd/usb, boot back up and should be back to way it was before that change.

I'm quite confused on the second step, can you do it for me please. The drive letter part.