> I got the same problem (monitor going to sleep). It is not a Radeon. What is it? (lspci -nn | grep VGA should show it)
Is the monitor CRT or is it connected via a cable extender? This might be a DDC problem, although I don't know why it would depend on the kernel version. Disabling framebuffer modules might help, I don't know how to do it (unless nomodeset does it). Or maybe it's not related to graphics. Can you access the machine from network? dmesg output of the kernel making it sleep would probably help.
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