Low performance when booting on battery power only

[mkopec]

Device

NovaCustom *

Dasharo version

v1.5.0 TGL, v1.7.0 ADL

Affected component(s) or functionality

Power limit configuration, power supply capabilities detection

Brief summary

In some cases the power limits are set to 0, which causes the CPU to throttle to 400mhz.

How reproducible

• 100% when coldbooting on battery power
• various, depending on AC adapter

How to reproduce

• disconnect AC adapter
• power on laptop
• view CPU frequency, e.g. in Windows Task Manager or turbostat on Linux

Expected behavior

CPU freq scales freely up to its limits

Actual behavior

CPU is stuck at 400MHz

Screenshots

No response

Additional context

Some AC adapters take too long to establish a PD contract, causing a timeout when programming limits. This can be solved by utilizing the PD controller's interrupt instead of polling the Active Contract PDO reg in a loop.

Solutions you've tried

W/A: Unplug and plug AC adapter back in