[fedora-arm] Funny display on Raspberry Pi

I have a Raspberry Pi 3B running Fedora AAarch connected to my TV.

After installed the latest version 31 updates, the display went weird on
me. Monitor preferences list an "unknown" monitor with resolution
1824x984 and refresh rate 77 Hz, and colours are all wrong. What should
be red or orange is blue, blue is red or brown, and I'm not really sure
what everything else I see on the screen is supposed to look like, but 
the greens may be more or less right.

Any idea what's going on?

I'm using the MATE desktop.

If I connect my CentOS 7 laptop to the same HDMI port using the same
cable, everything seems just fine.

- Toralf
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