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I installed Debian 6.0 on a Power Mac G5. First it would boot to a blank screen but I fixed that by blacklisting nouveau as described here.

Now the monitor will never turn off. It's a server so I'll mostly ssh into it and I want the monitor to power down after a very short time.

I have no xserver installed and just use the console. I've tried modifying /etc/kbd/config but that didn't work. I also tried installing console-tools and modifying /etc/console-tools/config but that didn't work. Then I tried using setterm and that didn't work. I even tried using console codes to blank the screen, but that didn't work either.

Does anyone know how I get control of the power saving modes for this console?

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Check out vbetool: unix.stackexchange.com/questions/44809/… –  Emanuel Berg Aug 25 '12 at 18:11
I'll look into this. For some reason I thought vbetool was X related but it appears I was wrong about that. –  Sean Lynch Aug 25 '12 at 18:19
Interesting. vbetool package doesn't exist for ppc architechture - bugzilla.redhat.com/show_bug.cgi?id=285361. –  Sean Lynch Aug 25 '12 at 18:55
I think that vbetool is x86-specific (its manpage references "real mode" and BIOS, for example). –  Renan Aug 26 '12 at 6:15

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