Public bug reported:
On Jaguar2, we found some items are bad from powertop, could we set them
'Good' by default from oem kernel, so that we could save more power
consumption.
System info
====
"ThinkPad X1 Yoga Gen 7", "BIOS": "N3AET52W (1.17 ) 02/21/2022",
CPU": "12th Gen Intel(R) Core(TM) i5-1235U", VGA: [8086:46a8],
Kernel: 5.14.0-1024-oem
Power Consumption
===
The idle-screen-on-residency-check/cpu-low-power-idle/system-low-power-idle
passed.
Default value and the value after set all ‘Good’ in powertop
ShortIdle: 5.5W, 5W
LongIdle: 1.8W, 2W
S2Idle: 0.6W, 0.6W
Bad items
===
* VM writeback timeout
(echo ‘1500’ > /proc/sys/vm/dirty_writeback_centisecs)
* Should we turn off the NMI watchdog for the OEM kernel? It prompt“NMI
watchdog should be turned off” (/proc/sys/kernel/nmi_watchdog)
* Runtime PM for I2C Adapter i2c-[2-10] (i915 gmbus tc[1-6]/dp[a-c])?
By default these values are ‘on’, should we set it to ‘auto’?
(/sys/bus/i2c/devices/i2c-2/device/power/control)
* Runtime PM for PCI Device Intel Corporation Device
[4601,46a8,461d,464f,51a4,51f0,5182,51ed,51ef,51fc]?
Host bridge,VGA controller,Signal processing controller,System
peripheral,Serial bus controller,Network Controller,ISA bridge,USB
controller,RAM memory,Serial controller.
(/sys/bus/pci/devices/0000:00:00.0/power/control)
* Runtime PM for PCI Device MEDIATEK Corp. Device 4d75
* Runtime PM for PCI Device Samsung Electronics Co Ltd Device a80a
* Autosuspend for USB device USB Bridge [MCHP]?
(/sys/bus/usb/devices/3-8/power/control)
** Affects: linux-oem (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1962799
Title:
Bad items from Powertop on oem kernel
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