@EC137 that's accurate same here. The PS5 1440p line issue is not resolved in 11.5, you still have to do the temporary fix(flip between game mode on off on until it goes away). The VRR flashing is what's resolved.
The line issue has evolved though. On 11.0 the line would start at the bottom and swim to the top of the bottom quarter. Now it starts in that position and roughly stays there.
Speculating, I think 11.5 pushed a driver update for the HDMI port. I had read the HDMI ports used have driver issues before so I think they're the culprit.
Fortunately there is a known working workaround to get the line to not appear you just must do it every time you first go to 1440p.
Thanks, I personally would opt to not use 1440/120 as opposed to being able to use game mode for reduced input latency. Unless the input latency is a non issue since it’s in 120hz mode. Hmm. Edit: I’ll have to try the game mode toggle off and on again to see if that works for me. They really do need to fix this- not worth the hassle.
@EC137 I think you got the gist after your edit but to clarify you ultimately end up in 1440p@120hz game mode ON. The toggling just causes a screen reset and after a few times(its taken me up to 10 or so tries) the line won't reappear and will stay that way so long as you don't change resolution or turn off the screen or go to the Roku Home page.