Comment # 101 on bug 21273 from Andrey Gusev

Created attachment 92956 [details]
Kernel log for fabricate_dcb_output(dcb, DCB_OUTPUT_TMDS, 1, 2, 2);

Monitor suspends with patch.
+       if (of_machine_is_compatible("PowerMac3,6")) {
+               fabricate_dcb_output(dcb, DCB_OUTPUT_TMDS, 1, 2, 2);
+               return;
+       }

I could see log in without patch and I saw symbols on the screen. I'll recheck
reaction on big output and switching virtual consoles.
I will try patch from comment 98.