Hi ! I have still problem with USB devices. When I plug in any devices, then USB require continuous busmaster activity. This behaviour disable powersave state for CPU in kernel 2.6.test7
When I have loaded modules usb-core, uhci-hcd, hid, all work fine. But whn I plug in mouse or card reader, busmaster resources are used too much.
May anybody explain or solve this behaviour?
Unplug that mouse or card reader ... :)
Mice are easy to explain: the USB host must poll the device every few milliseconds (mouse-specific) to see if it moved, and that's bus-master activity.
Card readers are less obvious. Most usb-storage card readers shouldn't cause activity unless they're in use; so unmounting the file system should prevent dma activity.
- Dvae
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