Re: T580: setting brightness freezes desktop temporarily

In message <https://marc.info/?l=openbsd-misc&m=178555157817795&w=1>,
Veraellyunjie wrote
> Thinkpad T580, no-nvidia version, only intel iGPU.
> There are Fn+F5 and Fn+F6 keys to control screen brightness.
> In Xenocara, brightness switches immediately,
>    yet desktop freezes for about a second.
> [[...]]
> The Fn brightness hotkeys don't trigger keypress events in `xev`.

I see identical behavior on my T580 (7.9-stable/amd64.

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