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I installed firmware-linux-nonfree on my 15" Powerbook G4 running Debian 8.7.

The idea was to enable hardware acceleration to improve the graphics performance. I added the

append="radeon.agpmode=-1 

line to the yaboot configuration file to prevent freezes as per the FAQ instructions but still I get random freezes in the first couple of minutes until I purge the firmware-linux-nonfree again.

I have a Mobility Radeon 9600 PRO Turbo graphics card. Has anyone got this to work and if so how?

  • I believe this could be the same problem that causes freezing in Ubuntu Mate 16.04 ppc and Lubuntu 16.04 ppc. Has anyone managed to solve it? – Simon Baldwin Jan 30 '17 at 12:44
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Adding radeon.agpmode=-1 as a boot parameter solved the problem. I found this advice on the Ubuntu Powerpc FAQs page.

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