Bluetooth Power Management question
"Davide Bertola" <[email protected]>
| Newsgroups | gmane.linux.bluez.user |
|---|---|
| Message-ID | <[email protected]> |
---------- Forwarded message ---------- From: Davide Bertola <[email protected]> Date: Thu, Apr 3, 2008 at 12:27 PM Subject: bluetooth question To: [email protected] Hi, I'm Davide from Italy. I'm a Ubuntu Linux user (Hardy). My hardware is a Macbook (1,1) first generation. I'm investigating why power battery life is so different usin osx (4.5/5 hours) or using linux (3/3.5 hours) [times are tested, not acpi estimated]. So this is my question. My macbook has bluetooth connected to usb 1-4 (uhci) and I see something strange. When bluetooth.ko is loaded and hci0 is UP powertop shows that usb 1-4 wakes up the cpu 100/140 times, and cpu is in c0 state for about 2% - 3% of the time. If I type "sudo hciconfig hci0 down" all those wakeups due to usb 1-4 disappear, and the cpu goes in c0 for only 0.4% of the time. If I also boot without loading bluetooth at all, my bluetooth mouse WORKS in a sort of usb emulation. It's seen as standard usb mouse. This way I can use the bt mouse without generating all those wakeups and cpu load. This reduce power consumption from 0.5 to 1W. So it seems to me that bluetooth module does a lot of work that is not necessary. Why all those wakeups and cpu load? The bluetooth adapter is from Cambridge Silicon Radio, like the powerbook ones. ------------------------------------------------------------------------- Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketplace _______________________________________________ Bluez-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/bluez-users