I guessed so.

The GPU is a Radeon HD5870, and the screen is an old Telefunken TV
(TLFK22LEDPVR1).

Since my real display got into repair I used this TV meanwhile, and to my
surprise it froze the system.

On Tue, 30 Mar 2021 at 10:15, Christian König <christian.koenig@amd.com>
wrote:

> Hi Alberto,
>
> well what hardware do you have?
>
> Interlaced resolutions are not used any more on modern hardware, so they
> are not well tested.
>
> Regards,
> Christian.
>
> Am 30.03.21 um 10:04 schrieb Alberto Salvia Novella:
> > The entire desktop hangs after some minutes when using the module
> > "radeon" with an interlaced resolution.
> >
> > Easier to trigger by playing a video on Firefox, at least on kwin_x11.
> > Wayland didn't exhibit the problem.
> >
> > Other display drivers, from different computers I have tried, didn't
> > allow those interlaced resolutions all together. It seems they know
> > there will be problems.
>
>