Hi. I have a new Dell Inspiron 7400 laptop with 11 gen intel core processor and intel Xe graphics.
Now i´m using dell intel drivers 126.96.36.19953 and all is working fine.
But last week, Dell release an update to version 188.8.131.5284 and with this, the brightness slider of windows 10 stop working, and even if you move it, the brightness is always at 100%.
I also have tried with the drivers from the intel website 184.108.40.20626 with the same result.
So it seems that the latest drivers broke something. Reverting back to the driver 220.127.116.1153 make the brightness to work again.
Thanks for your attention.
Since that first release that had the problem came from Dell, you need to be working with Dell regarding the delivery of a fix.