xrandr for undetected screen resolution no longer working?

[Frederic Muller]

Hi!

I connect one of my machines to my TVs. I have noticed that since
sometimes along F21 updates the specific TV resolution could not longer
be activated. As it is definitely not a life threatening condition I
thought another update would fix it. Apparently the problem might lay
elsewhere...

So I have 2 TVs (with different resolution) to test. I start with cvt,
then xrandr --newmode, xrandr --addmode and then --output.

At the --addmode stage the mode appears in (GNOME3) All settings,
Display, "monitor".

Whethere I use the graphical way or the --output command the monitor
remains in 1024x768.

Any idea what could be happening?

Thanks a lot.

Fred