Re: Empty /sys/class/backlight

[Dan Ritter <dsr@randomstring.org>]

Detlef Vollmann wrote: 
> Hello,
> 
> on my laptop (Lenovo X250) I run Debian testing.
> On a recent upgrade the kernel was updated from 6.12.38+deb13-rt-amd64
> to 6.16.3+deb14-rt-amd64 (and now to 6.16.9+deb14-rt-amd64).
> 
> With kernel 6.16 I lost /sys/class/backlight/intel_backlight.
> I also don't have the i915 module anymore, which I suspect might
> be related.

Very likely. Does it exist in /lib/modules/6.16.9+deb14-rt or
similar? If so, can you modprobe it?

Also: why are you using the RT build?

-dsr-