On Wed, 2012-07-04 at 14:42 -0400, Alan Stern wrote: > On Wed, 4 Jul 2012, Frederik Himpe wrote: > > > > What happens if you disable USB runtime suspend on the affected system? > > > Windows tends not to use it. > > > > It appears to make a difference, but it still does not work perfectly. > > > > I disabled autosuspend like this: > > root@piranha:/sys# for i in $(find -name autosuspend); do echo 0 > $i; done > > That doesn't disable autosuspend. The proper way is: > > echo on >/sys/bus/usb/devices/.../power/control > > where you fill in the "..." with the directory name for the webcam. usb trace from trying mplayer a few times after disabling autosuspend: ffff880415761ec0 897158138 S Ii:1:081:7 -115:128 16 < ffff8803c49ec800 897158252 S Co:1:081:0 s 21 01 0100 0003 001a 26 = 01000101 15160500 00000000 00000000 00000000 00000000 0000 ffff8803c49ec800 897162252 C Co:1:081:0 -71 0 ffff8803c49ec800 897162388 S Co:1:081:0 s 01 0b 0000 0003 0000 0 ffff8803c49ec800 897166377 C Co:1:081:0 -71 0 ffff880415761ec0 897166486 C Ii:1:081:7 -2:128 0 ffff880415761ec0 897844606 S Ii:1:081:7 -115:128 16 < ffff8803c49ec800 897844749 S Co:1:081:0 s 21 01 0100 0003 001a 26 = 01000101 15160500 00000000 00000000 00000000 00000000 0000 ffff8803c49ec800 897848746 C Co:1:081:0 -71 0 ffff8803c49ec800 897848879 S Co:1:081:0 s 01 0b 0000 0003 0000 0 ffff8803c49ec800 897852873 C Co:1:081:0 -71 0 ffff880415761ec0 897852965 C Ii:1:081:7 -2:128 16 = 0000e83f 335dbc5f f438be84 08004500 ffff880415761ec0 898444380 S Ii:1:081:7 -115:128 16 < ffff8803c49ecd40 898444471 S Co:1:081:0 s 21 01 0100 0003 001a 26 = 01000101 15160500 00000000 00000000 00000000 00000000 0000 ffff8803c49ecd40 898448507 C Co:1:081:0 -71 0 ffff8803c49ecd40 898448639 S Co:1:081:0 s 01 0b 0000 0003 0000 0 ffff8803c49ecd40 898452616 C Co:1:081:0 -71 0 ffff880415761ec0 898452722 C Ii:1:081:7 -2:128 0 ffff880415761ec0 899007841 S Ii:1:081:7 -115:128 16 < ffff8803c49ec800 899007939 S Co:1:081:0 s 21 01 0100 0003 001a 26 = 01000101 15160500 00000000 00000000 00000000 00000000 0000 ffff8803c49ec800 899011863 C Co:1:081:0 -71 0 ffff8803c49ec800 899012005 S Co:1:081:0 s 01 0b 0000 0003 0000 0 ffff8803c49ec800 899015986 C Co:1:081:0 -71 0 ffff880415761ec0 899016082 C Ii:1:081:7 -2:128 0 dmesg contains: [ 9146.620398] uvcvideo: Failed to set UVC probe control : -71 (exp. 26). -- Frederik Himpe <fhimpe@xxxxxxxxxx> -- 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
