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    See this post, where the most-upvoted answer counsels editing xorg.conf manually with your HorizSync and VertRefresh values.
    – harrymc
    Commented Dec 23, 2023 at 20:12
  • @harrymc Thanks for the pointer, but I tried several suggestions from that post, to no avail. I added the lines you indicated. I added the option that looks like it's supposed to turn off all the checking. And I removed xorg.conf entirely. All tried individually, and none made any difference. :( Commented Dec 28, 2023 at 3:17
  • I've also tried moving the monitor from DVI-D-0 to DP-5, as there were comments in that thread that indicated that different ports, or adapters connected to them, sometimes messed something up. Needless to say, nothing changed. Commented Dec 28, 2023 at 3:29