Re: Monitor is not detected at all, and ConnectedMonitor / UseDisplayDevice do not help.
I don't see the problem you're reporting in the bug report you attached. The CRT is detected, however its EDID is not:
(--) NVIDIA(0): --- EDID for CRT-0 ---
(--) NVIDIA(0): No EDID Available.
(--) NVIDIA(0): --- End of EDID for CRT-0 ---
As 1.0-8776 is no longer supported, if you need further assistance, please clarify the problem, along with a bug report against 1.0-9631 or 1.0-9742.