On 10/5/25 18:07, Dan Ritter wrote:
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?
No, it doesn't exist anymore:
modprobe: FATAL: Module i915 not found in directory
/lib/modules/6.16.9+deb14-rt-amd64
Also: why are you using the RT build?
I'm using it on all my machines for a very long time now
as I sometimes need some realtime guarantees.
It might not make a big difference these days.
Detlef
