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this post was submitted on 23 Nov 2023
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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DVI should not control the monitor's actual physical controls - it does include a small non-display channel but IIRC that's used to get the display modes info from the monitor, and potentially to transmit contrast information and the like; some monitors will prevent you from adjusting contrast if DVI sends that info for example, but it certainly shouldn't disable the power button.
My guess would be a hardware issue - in the monitor itself - which is somehow triggered by the sequence in which you do enable the displays, and your system update being unrelated. It's a huge guess though. One thing to try is repeating both sequences (the one that locks your buttons and the one that doesn't) using a live CD - not a "nobara 38" one if such a thing exists, another distro. Trying both monitors on another computer would be an interesting test as well, although not necessarily that helpful (because if it doesn't occur there, it might just mean the issue is triggered by peculiarities in your graphic card).
So I decided to bite the bullet and did a fresh install of Fedora 39 and that appeared to have made the issue go away. In the process of installing updates and configuring it the way I like, the monitor control buttons on both monitors response. So, it seems like the cause of the issue could have been a glitch during an update. Who knows? At least I know that it's not a hardware issue (cross finders). :)