** Model information sys_vendor: LENOVO product_name: 20Q0CTO1WW product_version: ThinkPad X390 chassis_vendor: LENOVO chassis_version: None bios_vendor: LENOVO bios_version: N2JET83W (1.61 ) board_vendor: LENOVO board_name: 20Q0CTO1WW board_version: SDK0J40700 WINSince upgrading to Linux 5.3 from 5.2 under Debian Testing, I am seeing a power usage regression. I run powertop --auto-tune on boot and all tunables are marked as good.
With Linux 5.2, powertop reported an idle battery discharge rate of between 3 and 4 W and CPU package C states seemed normal (majority of time spent in pc7).
However, with Linux 5.3, powertop reports an idle battery discharge rate of between 5 and 6 W. The CPU package C states are all reported as follows all of the time:
C2 (pc2) 0.0% C3 (pc3) 0.0% C6 (pc6) 0.0% C7 (pc7) 0.0% C8 (pc8) 0.0% C9 (pc9) 0.0% C10 (pc10) 0.0%I noticed this with the first version of Linux 5.3 to be included into Testing.
I upgraded the UEFI BIOS from 1.55 to 1.61 to see if that would make any difference, but it didn't.
I did submit a bug report at https://bugs.debian.org/cgi-bin/bugrepo ... bug=946922 but I'm getting sick of the reduced battery life and wondered if anyone here can suggest a workaround or option to pass to the kernel at boot.
I don't want to return to Linux 5.2 because I've found the track pad is better supported under 5.3 (under Debian at least).
I'd also like to avoid building my own kernel (just from a maintenance perspective and having to fiddle around with secure boot etc.)