What sort of a Graphics Accelerator does the system have. I faced a similar problem on my Laptop & I narrowed down the issue to a bad driver for my NVidia Graphics card. Once I fixed that, the battery life on Linux matched up to that on Windows XP. Regards, Karthik On Mon, Aug 18, 2008 at 6:54 PM, Vedran Rodic <vrodic@xxxxxxxxx> wrote: > I've decided to write up something that I've been aware of for some time, > but that didn't really bother me that much, since I've been waiting for the > situation to improve quietly. > > The basic observation is: My trusty X60s uses less power when on battery > on Windows than on Linux. > > This situation hasn't changed significantly despite the appearance of powertop > to trim the number of processor wakeups per second thus enabling the > processor to stay in deep sleep states for longer time and improvements in > the Xorg intel video driver. > > I get arround 3.3 wakeups per second minimally when > my Xorg/KDE is not active, with laptop using 9.1 W (as reported by > powertop). When Xorg/KDE is running, with one konsole to monitor usage with > powertop, I get arround 13 wakeups per second and power usage of 9.4 W. All > the measurements are done with LCD brightness on the lowest level, wireless > interfaces disabled, and all power saving features that powertop can detect > enabled. Processor is in C3 state 99.9% of the time. I tried removing > various driver modules that I didn't use at the time (irda, pcmcia, > ethernet, sound), but no change. > > Windows power monitoring tool from Lenovo reports power usage of 6.5 W under > the same LCD brightness level and with wireless disabled. > > This was tested under Linux 2.6.26-rc8 (some git level after the rc8 > release). Older > versions of the kernel didn't show any statistically significant > differences. powertop > is version 1.10, and the software used under Windows XP > is Lenovo ThinkVantage Power Manager. > > Since I doubt that Windows XP has less wakeups per second than my > Linux setup, I guess > there are still a couple of IBM specific power saving > registers/controls that can be > tweaked so that the laptop uses less power. Does anybody have any idea > on what would that > be? Any friendly contacts at lenovo? > > Thanks > Vedran Rodic > -- > To unsubscribe from this list: send the line "unsubscribe linux-acpi" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
