Desktop scaling on 3 different Thinkpad X1

[Frederic Muller]

Hi!

At each new Fedora release I have 3 thinkpads to 'upgrade'. In fact I do 
fresh installs for those and have a list of steps to perfom so I don't 
forget anything (list which I maintain and update at each release as 
things do change over time).

Desktop scaling is always tricky and this time I only get it to work on 
1 of those 3 Thinkpads. They are 3rd, 6th and 8th generation ones. 
Currently it only works on the 8th gen one.

I type this:

gsettings set org.gnome.mutter experimental-features
"['scale-monitor-framebuffer']"

On 3rd gen I can only do 100% and 200% and on 6th gen I cannot even do 
200% as it says there is some HW limitation message preventing to change 
anything.

Any advice on how to troubleshoot the issue would be very welcome.

Thank you very much.

Fred