Bug#825403: linux: [regression from 4.5.0-1] power consumption increased significantly on T460p
Source: linux
Version: 4.5.0-2
Severity: normal
Dear Maintainer,
Since the dist-upgrade this weekend, I noticed massively increased power
consuption on my T460p. I measure this by battery lifetime and the wattage
reported by ACPI.
The wattage has increased from the range of 7W -- 10W with my usage pattern to
10W -- 12W. These increased metrics are not due to a change in measurement. The
battery life has reduced alongside. I have tested with 4.5.0-1 and the problem
does not occur there.
I was unable to find a possible cause using powertop. What I noticed is that
the fan runs even though it would normally not under the load I am putting on
the machine. I cannot tell whether this is the cause of the problem, or whether
the fan merely runs because something else is putting load on some system
component which needs cooling.
Please let me know whether there is anything I can do to provide more
meaningful data.
-- System Information:
Debian Release: stretch/sid
APT prefers testing
APT policy: (990, 'testing'), (500, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386
Kernel: Linux 4.5.0-1-amd64 (SMP w/8 CPU cores)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
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