10 hours ago
I haven't been able to reproduce this problem. Manually created some 2048 pixel wide content and played it on my CCwGTV connected to a 1080P monitor. It scaled the video no problem.
Go to this menu and tell me what the setting is.
In the Jellyfin app on your TV
Settings (Gear in top right) > Playback > scroll down to Advanced playback preferences > What is the Refresh rate switching setting set to?
Go to this menu and tell me what the setting is.
In the Jellyfin app on your TV
Settings (Gear in top right) > Playback > scroll down to Advanced playback preferences > What is the Refresh rate switching setting set to?