On Tue, Sep 15, 2009 at 08:51:45PM +0200, Andreas Mohr wrote: > Hi, > > currently running 2.6.31, and what I've been suspecting for quite some > time (several weeks) is actually true: after S2R resume > all friendly USB autosuspend settings are history and we're back > to the dreaded old 100% activity (powertop -d): > > Recent USB suspend statistics > Active Device name > 100.0% USB device 5-5 : Acer Crystal Eye webcam (SuYin) > 100.0% USB device usb5 : EHCI Host Controller (Linux 2.6.31 ehci_hcd) > 0.0% USB device usb4 : UHCI Host Controller (Linux 2.6.31 uhci_hcd) > 0.0% USB device usb3 : UHCI Host Controller (Linux 2.6.31 uhci_hcd) > 0.0% USB device usb2 : UHCI Host Controller (Linux 2.6.31 uhci_hcd) > 0.0% USB device usb1 : UHCI Host Controller (Linux 2.6.31 uhci_hcd) > > Is there any fix planned for this? This is possibly even more important > (power wasted due to wakeups, I'd judge it to be up to 1.5W on this 8.5W > Aspire One machine) than any other runtime PM implementation... > > OTOH this problem is probably isolated to uvc devices, since: > # lsusb -t > /: Bus 05.Port 1: Dev 1, Class=root_hub, Driver=ehci_hcd/8p, 480M > |__ Port 5: Dev 7, If 0, Class='bInterfaceClass 0x0e not yet handled', Driver=uvcvideo, 480M > |__ Port 5: Dev 7, If 1, Class='bInterfaceClass 0x0e not yet handled', Driver=uvcvideo, 480M > /: Bus 04.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M > /: Bus 03.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M > /: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M > /: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M > > So, does the uvc driver need a bit of handholding here? > It likely shouldn't simply forget about its autosuspend status after > resume... > > Or would Matthew's uvc autosuspend patch > http://osdir.com/ml/fedora-extras-commits/2009-07/msg06079.html Could you try that? A certian hardware manufacturer is insisting that this patch solves problems, which I have not been able to validate, and it would be good to get some independant tests. thanks, greg k-h -- 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
