On Sat, 28 Nov 2009, Joey Lee wrote: > Thank's for your information. I already add the trace parameter > in /etc/modprobe.d > > So, the trace log was enabled when uvcvideo modprobe. Then I run the > following testing procedure: > > ac-power plug-in then system boot > wait 5 minutes stable > ac-power unplug, laptop-mode-tools's USB module work > wait stable 0.711 A 7.89 Watt > echo auto > 1-8/power/level 0.674 A 7.48 Watt > Wait stable > echo auto > 1-8/power/level 0.677 A > > The attached files are dmesg.log and messages log, I have check those 2 > log file but didn't see any different with laptop-mode-tools and run > "echo auto" command manually. > But the hadware metter have show the Watt value down immediately after > run "echo auto" command manually. I don't know the reason why your power usage went down after the "echo auto", but I don't think uvcvideo had anything to do with it. In fact, you should run your test again, but this time do "rmmod uvcvideo" just after the system finishes booting. Then the uvcvideo driver will be completely out of the picture. Also, try doing "echo on >1-8/power/level" to see if the usage goes up again. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
