LenovoLegionLinux #491 (issue): the umbrella issue for
EC chip 0x5508, which includes the Legion 5 15IAX10 (83F0, earlier #359 and #475). On 83F0 temperatures, fan speed and
power-mode switching work through WMI; the EC fan-curve path copied from another model reads garbage. For the same
firmware family the thread decodes fan-curve access as WMI WMAB ids 5 and 6 with ten levels in EC F101..F10A, a commit
through LECR(0xD0,1,1,2), valid only in custom power mode and read-only in extreme mode. That matches what our
LegionFan found (fan modes need Lenovo Custom mode). Worth checking against our DSDT. GPL-2.0, ideas only. Medium
confidence.