Package: laptop-mode-tools
Version: 1.69.2-1
Followup-For: Bug #814578
I have this problem too, but it's even worse for me.
The throttling to "50%" ends up mapping to "always stuck at the bog minimum
slowest speed possible".
cpufreq-info -c 0:
driver: intel_pstate
CPUs which run at the same hardware frequency: 0
CPUs which need to have their frequency coordinated by software: 0
maximum transition latency: 0.97 ms.
hardware limits: 800 MHz - 3.00 GHz
available cpufreq governors: performance, powersave
current policy: frequency should be within 800 MHz and 3.00 GHz.
The governor "powersave" may decide which speed to use
within this range.
Even running burnP6 * nCPUs from cpuburn won't bump it off the bare minimum
800MHz when on battery.
My cpu is a:
model name : Intel(R) Core(TM) i7-4500U CPU @ 1.80GHz
Which I guess explains why "50%" is "800MHz" -- 3GHz is the max turbo freq,
800MHz is presumably the only step close to 1800/2=900 MHz.
>From what I've read, preventing the CPU from bumping up to higher
frequencies can actually *increase* power consumption because it forces the
CPU to stay awake longer before returning to an idle low power / sleep
state.
Needless to say I'm fixing this locally in my config files, but I would
suggest that the current defaults should be revisited as producing poor
behavior, and possibly being misguided.
-- System Information:
Debian Release: stretch/sid
APT prefers testing
APT policy: (990, 'testing'), (500, 'buildd-unstable'), (500, 'unstable'),
(1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386
Kernel: Linux 4.4.0-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
Versions of packages laptop-mode-tools depends on:
ii init-system-helpers 1.29
ii lsb-base 9.20160110
ii psmisc 22.21-2.1+b1
ii util-linux 2.27.1-6
Versions of packages laptop-mode-tools recommends:
ii ethtool 1:4.5-1
ii hdparm 9.48+ds-1
ii net-tools 1.60+git20150829.73cef8a-2
ii python-qt4 4.11.4+dfsg-1+b3
pn sdparm <none>
ii udev 229-3
ii wireless-tools 30~pre9-9
Versions of packages laptop-mode-tools suggests:
ii acpid 1:2.0.26-1
-- no debconf information
