Powertop reports "Bad" "Runtime PM for PCI Device"

Question

I've noticed that powertop utility reports "Bad" "Runtime PM for PCI Device" for several devices. Seems that powertop can fix the issue but it won't tell what exactly it does to fix it. What should I do to fix that "Runtime PM..." issue?

score 5 · Answer 1 · answered Feb 10 '12 at 21:52

Create a file called /etc/udev/rules.d/10-runtime-pm.rules with the following content:

SUBSYSTEM!="pci", GOTO="power_runtime_rules_end"
ACTION!="add", GOTO="power_runtime_rules_end"

KERNEL=="????:??:??.?"
PROGRAM="/bin/sleep 0.1"

ATTR{power/control}=="*", ATTR{power/control}="auto"

LABEL="power_runtime_rules_end"

After a reboot runtime PM should be enabled for all devices that support it. It is also enables it for all hotplugged devices.

score 4 · Answer 2 · edited Apr 13 '17 at 12:14

4

You need to set power/control attribute to auto for these devices. The easiest way to set it immediately for all PCI devices is:

echo auto | sudo tee /sys/bus/pci/devices/*/power/control

Bash complains when using output redirection (>) to multiple files as ambiguous redirect.

If you want to set it permanently use approach described in this answer.

edited Apr 13 '17 at 12:14

Community

1

answered Oct 08 '15 at 07:18

kravemir

151
4

score 3 · Answer 3 · answered Oct 03 '12 at 08:27

3

Since the bios 2.11 update on the UX32VD this rule breaks usb device auto detection. I don't really know how, but since then to detect usb devices, the xhci_hcd module must be reloaded after a usb devce is connected to detect it.

answered Oct 03 '12 at 08:27

bugmenot

31
1

Is there any fix known? – Andreas Mueller Dec 09 '12 at 11:15
How to reload the xhci_hcd module? – akaihola Mar 31 '13 at 06:32
@AndreasMueller check https://help.ubuntu.com/community/AsusZenbookPrime#Enable_power_management for a possible work-around – disabling power management for the xHCI chip only. – akaihola Mar 31 '13 at 06:37

score 2 · Answer 4 · edited Feb 09 '18 at 07:21

2

This CrunchBang Linux forum thread helped me to solve this.

You enable PM for each of your PCI devices this way :

echo auto > /sys/bus/pci/devices/*/power/control

The forum thread shows a nice powersaving script btw.

edited Feb 09 '18 at 07:21

suriv

103
4

answered Nov 24 '11 at 06:27

Bathz

121
7

Link is dead, archive link: https://web.archive.org/web/20150207164556/http://crunchbang.org/forums/viewtopic.php?id=11954 – Dark May 05 '19 at 11:42

Powertop reports "Bad" "Runtime PM for PCI Device"

4 Answers4