Turns out this is going to be really hard. It requires change in both
PCI and HDA, and potentially in nouveau and proprietary nvidia driver.
I'll revisit this once upstream devs have a concrete plan.
** Changed in: linux (Ubuntu)
Status: In Progress => Confirmed
** Changed in: linux (Ubuntu)
Assignee: Kai-Heng Feng (kaihengfeng) => (unassigned)
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https://bugs.launchpad.net/bugs/1907212
Title:
Power consumption regression after upgrade to 20.10 5.8.0-31-generic
Status in linux package in Ubuntu:
Confirmed
Bug description:
After upgrading to Ubuntu 20.10 which ships kernel 5.8.0-31-generic,
battery life is considerably less and power consumption is about 10
watts more idle, (idling at 14-15 watts) using integrated graphics.
This is a hybrid GPU laptop Intel HD 630/GP107M, and based on past
experiences a possible cause is not powering off the dedicated GPU
completely while using the integrated.
Running sudo powertop --auto-tune doesn't eliminate the issue.
$ cat /sys/bus/pci/devices/0000:01:00.0/power/runtime_status
suspended
$ cat /sys/bus/pci/devices/0000:01:00.0/power/runtime_suspended_time
1815948
$ cat /sys/bus/pci/devices/0000:01:00.1/power/runtime_status
active
$ cat /sys/bus/pci/devices/0000:01:00.1/power/runtime_suspended_time
3827
Device "01:00.1 Audio device: NVIDIA Corporation GP107GL High
Definition Audio Controller" appears active, does this mean that the
audio subsystem of dGPU keeps it enabled, causing the 10-watt
consumption?
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