On Mon, Oct 29, 2018 at 3:38 PM Giles Orr via talk <talk@gtalug.org> wrote:
One possible solution (which you may not need anymore, but I thought I'd throw it out there) is to run xrandr or arandr to switch off the monitor. This would bring all the windows back onto the primary monitor. You could then try using [xa]randr to turn the monitor back on, which might "refresh" the monitor.
Thanks, Giles. I think I've come to an understanding with the BIOS settings. (ThinkPad) Thunderbolt Security Level can be: No Security User Authorization Secure Connect Display Port [sic] and USB If I choose the first two in the BIOS, I can modify the settings in the dedicated Thunderbolt settings panel in Fedora. I can even choose to disable Thunderbolt support in the panel by setting it to DisplayPort and USB. I can't remember how Secure Connect behaved (or why it was unsuitable), but I'll try it again when I get a chance. If I choose the last setting in the BIOS, the Settings panel says "Thunderbolt support has been disabled in the BIOS." As much as I'd like to have options, this seems to be the only setting that permits the external monitor to be recognized when I jiggle the mouse. Even the same setting in Fedora, although it starts with good intentions, forgets after a while and I need to resort to unplugging/replugging. Mike