Thanks to you, Chris, I'm now sure it's acpi related. When disabling it completely in grub configuration (acpi=off), the issue is no more. But I'm pretty certain that's not a good thing to do !

But options you gave me
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_os_name=Linux acpi_osi=vendor"
made the luminosity control of the screen work. I try to look at the bright side !

Maybe there are other options for the kernel. I keep looking.

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