Public bug reported:
Description: Ubuntu 19.04
Release: 19.04
Package:
tlp:
Installed: 1.1-2ubuntu1
Candidate: 1.1-2ubuntu1
Version table:
*** 1.1-2ubuntu1 500
500 http://pl.archive.ubuntu.com/ubuntu disco/universe amd64 Packages
500 http://pl.archive.ubuntu.com/ubuntu disco/universe i386 Packages
100 /var/lib/dpkg/status
This is small bug that I found when checking max possible power saving
of my laptop.
I have set AHCI_RUNTIME_PM_ON_BAT to auto on file /etc/default/tlp:
# Runtime Power Management for AHCI host and disks devices:
# on=disable, auto=enable.
# EXPERIMENTAL ** WARNING: auto will most likely cause system lockups/data loss.
AHCI_RUNTIME_PM_ON_AC=auto
AHCI_RUNTIME_PM_ON_BAT=auto
tlp-stat -T (TLP debug log) says that enabled:
sie 31 09:01:38 mateo-PE70-7RD tlp[1694]: set_ahci_runtime_pm(0).auto:
host=/sys/bus/pci/devices/0000:00:17.0/ata1
sie 31 09:01:38 mateo-PE70-7RD tlp[1695]: set_ahci_runtime_pm(0).auto:
host=/sys/bus/pci/devices/0000:00:17.0/ata2
sie 31 09:01:38 mateo-PE70-7RD tlp[1696]: set_ahci_runtime_pm(0).auto:
host=/sys/bus/pci/devices/0000:00:17.0/ata3
sie 31 09:01:38 mateo-PE70-7RD tlp[1697]: set_ahci_runtime_pm(0).auto:
host=/sys/bus/pci/devices/0000:00:17.0/ata4
but tlp-stat says different thing:
+++ AHCI Host Controller Runtime Power Management
/sys/bus/pci/devices/0000:00:17.0/ata1/power/control = on
/sys/bus/pci/devices/0000:00:17.0/ata2/power/control = on
/sys/bus/pci/devices/0000:00:17.0/ata3/power/control = on
/sys/bus/pci/devices/0000:00:17.0/ata4/power/control = on
I have found that in file "/usr/share/tlp/tlp-functions" in line 1491 is:
{ printf '%s\n' $control $control > ${device}/power/control; } 2>
/dev/null
what I think could be a problem. After change to this it starts to work:
{ printf '%s\n' $control > ${device}/power/control; } 2> /dev/null
Could you please check this? It seems Ubuntu 18.04 could have the same
problem (the same package).
Best Regards
Mateusz
** Affects: tlp (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1842169
Title:
AHCI Host Controller Runtime Power Management not set to powersave
mode "auto" despite set AHCI_RUNTIME_PM_ON_BAT to "auto"
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