... additional info to my previous comment:
after enabling "Load Legacy Option Rom" in BIOS, backlight is working ok (also when I use f4/f5 keys).
Bios version A08, model XPS L322X
... additional info to my previous comment:
after enabling "Load Legacy Option Rom" in BIOS, backlight is working ok (also when I use f4/f5 keys).
Bios version A08, model XPS L322X