Comment 4 for bug 144305

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Benjamin Herrenschmidt (benh-kernel) wrote : Re: [gutsy] sleep on powerbook crashes

APM emu should still be useful to notify apps that directly listen to /dev/apm_bios such as X, though I haven't seen that working properly lately.

A few things you can try:

 - First, check if radeonfb is loaded & working
 - Try sleeping from console mode without having ever launched X from boot
 - Try sleeping from console mode after switching to console from X
 - Try sleeping with network manager not running
 - Try all of the above while booting with the feisty kernel