Hi: I just got a Lenovo Yoga 2 Pro, and I'mrunning Fedora 20 on it. I'm trying to get power usage down with powertop, but it is producing some screwy numbers. When I run the machine with wifi on, I get idle consumption just under 7.2W but almost 5W of that is assigned to the WiFi interface, even though there is little traffic. When I turn the wifi off, power consumption only drops to just under 7W. I don't think that there is a phantom WiFi that is still consuming power, so it appears to me that powertop is assigning too much blame to the WiFi interface. Is there away of fixing the assignment of blame here? peter PS: Here are truncated typical powertop outputs, first with wifi on and then with wifi off. 1/ The battery reports a discharge rate of 7.15 W The estimated remaining time is 3 hours, 39 minutes Summary: 251.9 wakeups/second, 4.2 GPU ops/seconds, 0.0 VFS ops/sec and 1.6% CPU use Power est. Usage Events/s Category Description 4.82 W 1.2 pkts/s Device Network interface: wlp1s0 (iwlwifi) 1.72 W 10.0% Device Display backlight 131 mW 13.1 ms/s 188.4 Process /usr/lib64/thunderbird/thunderbird 11.7 mW 398.5 µs/s 19.9 Process [irq/61-iwlwifi] 2/ The battery reports a discharge rate of 6.92 W The estimated remaining time is 3 hours, 42 minutes Summary: 453.6 wakeups/second, 23.2 GPU ops/seconds, 0.0 VFS ops/sec and 3.0% CPU use Power est. Usage Events/s Category Description 1.47 W 10.0% Device Display backlight 205 mW 14.4 ms/s 197.5 Process /usr/lib64/thunderbird/thunderbird 184 mW 2.2 ms/s 34.1 Process /usr/bin/xfce4-terminal 110 mW 2.4 ms/s 164.4 Interrupt PS/2 Touchpad / Keyboard / Mouse _______________________________________________ PowerTop mailing list PowerTop(a)lists.01.org https://lists.01.org/mailman/listinfo/powertop

From: Marc MERLIN <marc_powertop(a)merlins.org&gt;

Unfortunately, it's not just you. I've reported the same problem multiple times over the last year, but not heard back from anyone yet (except you saying you see the same). I had this on a T530, and now it's even worse on a T540: The battery reports a discharge rate of 28.5 W The estimated remaining time is 1 hours, 53 minutes Summary: 689.5 wakeups/second, 214.0 GPU ops/seconds, 0.0 VFS ops/sec and 10.4% CPU use Power est. Usage Events/s Category Description 15.3 W 95.8% Device Display backlight 2.07 W 36.0 ms/s 642.4 Process /usr/bin/enlightenment 115 mW 4.5 ms/s 62.3 Interrupt PS/2 Touchpad / Keyboard / Mouse 86.8 mW 0.9 ms/s 37.0 Process xfce4-terminal -T window11 --role=window11 --tab 71.3 mW 35.4 ms/s 36.2 Process /usr/bin/X :0 vt7 -br -nolisten tcp -auth /var/r 51.2 mW 0.8 ms/s 27.9 Timer hrtimer_wakeup 15W for my backlight at mid brightness? I don't think so.

On Monday 06 January 2014 at 11:53:15, Andreas wrote: > Hi, > > On Sun, Jan 05, 2014 at 12:00:02PM -0800, powertop-request(a)lists.01.org wrote: > > From: Marc MERLIN <marc_powertop(a)merlins.org&gt; > > > > Unfortunately, it's not just you. I've reported the same problem > > multiple times over the last year, but not heard back from anyone yet > > (except you saying you see the same). > > > > I had this on a T530, and now it's even worse on a T540: > > The battery reports a discharge rate of 28.5 W > > The estimated remaining time is 1 hours, 53 minutes > > > > Summary: 689.5 wakeups/second, 214.0 GPU ops/seconds, 0.0 VFS ops/sec > and > > 10.4% CPU use > > > > Power est. Usage Events/s Category > Description > > > > 15.3 W 95.8% Device Display > backlight > > 2.07 W 36.0 ms/s 642.4 Process > > /usr/bin/enlightenment > > 115 mW 4.5 ms/s 62.3 Interrupt PS/2 Touchpad / > > Keyboard / Mouse> > > 86.8 mW 0.9 ms/s 37.0 Process xfce4-terminal > -T > > window11 --role=window11 --tab 71.3 mW 35.4 ms/s 36.2 > > Process /usr/bin/X :0 vt7 -br -nolisten tcp -auth /var/r 51.2 > mW > > 0.8 ms/s 27.9 Timer hrtimer_wakeup> > > 15W for my backlight at mid brightness? I don't think so. > > 600+ wakeups/second sounds like the usual intermediate activity > due to touchpad/mouse movement (that figure is exactly what I usually > got > on my machine), and if that is the case > (what happens if the human part gets its dirty fingers off the machine? > :) > then it's strange to see this otherwise *very high* value (642.4) > attributed to /usr/bin/enlightenment (a very seasoned/stable WM, for > crying out loud) rather than mouse as in the *directly following* > PS/2 Touchpad / Keyboard / Mouse > line. > > Or, in other words, this example hints at a rather mischievous mixup of > data, e.g. an off-by-1 or a post-insert of certain items without > accounting > for other columns (within the data model, of course), or perhaps (the > column data values might even support such a suspicion) even completely > wrong (re-sorted) display of data. > > Perhaps I should actually test/investigate a recent powertop version... > ;) > > Andreas Mohr IMHO, the usage and event counters seem to be valid. What's wrong is energy estimation: it is done entirely in software, using some strange semi-heuristic guesswork. -- Ivan Shapovalov / intelfx /_______________________________________________ PowerTop mailing list PowerTop(a)lists.01.org https://lists.01.org/mailman/listinfo/powertop