** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Kai-Heng Feng (kaihengfeng)
** Changed in: linux (Ubuntu)
Status: Incomplete => In Progress
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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:
In Progress
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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