Bug 201201

Summary: [amdgpu] Can't raise power limit on Vega
Product: Drivers Reporter: Aleksandr Mezin (mezin.alexander)
Component: Video(DRI - non Intel)Assignee: drivers_video-dri
Status: RESOLVED CODE_FIX    
Severity: normal CC: alexdeucher, anthony.ruhier
Priority: P1    
Hardware: x86-64   
OS: Linux   
Kernel Version: 4.19-rc4 Subsystem:
Regression: No Bisected commit-id:

Description Aleksandr Mezin 2018-09-22 00:39:04 UTC 
On Windows I can increase the power limit to +50% (150%) in wattman. On Linux for some reason I can only set it lower than the stock value. Any attempts to write a value that's bigger than the stock one into power1_cap fail with "Invalid argument":

# echo 320000000 >power1_cap
-bash: echo: write error: Invalid argument
Comment 1 Anthony Ruhier 2018-09-23 11:01:47 UTC 
My watercooled vega 64 is reaching the power limit (240W) very easily, with its temperature staying at ~50°c. The only way to allow the boost to go further (and it is honestly needed to get 60fps in 1440p) would be to undervolt, but it will then be limited by the voltage, or to increase the power limit.

It would be really cool to allow a margin over the default power cap, like the windows driver does.