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Ubuntu 12.04 - default Radeon driver does not work at all

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linux-howto

http://askubuntu.com – I've recently upgraded to 12.04 LTS and I have an ATI Radeon HD5570. I've heard that the open source 'Radeon' driver is used by default. However, it wasn't showing anything for me. What I did was I added the 'nomodeset' option to boot up and install fglrx. But it didn't work well for me as it introduced a lot of problems (freezes/glitches). So I removed/purged fglrx and am planning to use the open source drivers instead. So my question is this: Why is my default Radeon driver not working? Is anyone having a similar issue? I've also tried using the ubuntu-x-swat driver by running the ff comman (HowTos)