Undervolt not working on Dell XPS 7590

[BRA1L0R]

Yet another dell xps issue,

the XPS 15 7590 has been added to the support list in the latest commit but undervolt doesn't seem to be working on my machine. I tried both 1.5.1 and the latest bios (1.8.1).

[jayv]

same issue here XPS 7590

sudo python undervolt.py --core -150                                                                
WARNING:root:You have supplied different offsets for Core and Cache. The smaller of the two (or none if you only supplied one) will be applied to both planes.
ERROR:root:Failed to apply core: set -150.390625, read 0.0

It may have something to do with msr.allow_writes=on kernel option (have to validate)

[hackthejawn]

Having the same issue on Linux Mint 20.1. Command and results:

sudo undervolt --core -100 --cache -100
ERROR:root:Failed to apply core: set -99.609375, read 0.0

Willing to help with diagnostics and testing if you need anything.

[hackthejawn]

Fixed this by resetting BIOS to factory defaults, per this issue:

kitsunyan/intel-undervolt#43 (comment)