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I installed Catalyst drivers from the AUR using makepkg -sri, and the installation went through successfully. However, now I can't start X at all.

On boot, X tries to start but instead gives me a blue screen saying that X failed to start. The log files say the following errors:

...
(WW) glamor0: Failed to get GLSL version
(EE) RADEON(0): Failed to initialize glamor.
(EE) RADEON(0): Acceleration initialization failed
...

/usr/lib/xorg-server/Xorg: symbol lookup error:
/usr/lib/xorg/modules/drivers/radeon_drv.so: undefined symbol: exaGetPixmapDriverPrivate

That's just about all the info I get. The /etc/X11/xorg.conf.d has a file 20-radeon.conf and it looks like this:

Section "Device"
    Identifier "Radeon"
    Driver "radeon"
    Option "ColorTiling" "on"
    Option "ColorTiling2D" "on"
    Option "TearFree" "on"
EndSection
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The file 20-radeon.conf actually make X load the open source driver with the line Driver "radeon". The proprietary driver (Catalyst) is called "fglrx". I doubt, that changing just this line would work. You probably should remove this file from this folder.

The Catalyst driver has configuration tool for setting up X called aticonfig. See https://wiki.archlinux.org/index.php/AMD_Catalyst#Configuring_the_driver for instructions on how to use it. It will replace /etc/X11/xorg.conf with a working configuration.

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