On 2025-08-23 21:13:13 Felix Miata via tde-users wrote:
J Leslie Turriff composed on 2025-08-23 20:47 (UTC-0500):
: :
(I won't be using xrandr to modify any of the zillion settings shown on the info page; hardware stuff makes my head hurt. :-) I never should have messed with Monitor & Display in the first place.)
If it's still not working, I suggest simply switching to a DisplayPort cable. DP was /designed/ for computers, HDMI for TV. DP has functionality in PC environments HDMI cannot provide that sometimes makes a difference, e.g. MST[1]. I suspect also a lot of Linux devels don't have 3440x1440 displays to test with, so must rely on actual user reports to know if trouble with extra-wides sneaks into something.
[1] https://en.wikipedia.org/wiki/DisplayPort#Multi-Stream_Transport_(MST)
Thanks Felix. I took a chance and rebooted the machine, and all is well. Apparently, though there is no way to back out the "Test Settings" they are not actually permanently stored; but unless one really understands how this stuff works (and I don't), avoid fiddling with these monitor 'improvement' tools. :-)
Leslie