Re: autosuspend for HID devices, take #4
Alan Stern <[email protected]>
| Newsgroups | gmane.linux.usb.devel |
|---|---|
| Message-ID | <[email protected]> |
On Mon, 28 May 2007, Jiri Kosina wrote: > Hi Alan, > > you are right, however there is still a reason I think that this is not > the case. > > What I am seeing is that the keypresses are lost only if I hit a key (and > thus wake the autosuspended keyboard up) only after a short time it goes > to suspend. When I leave it autosuspended for 2 or more seconds > (approximately), it behaves nicely. > > Sure, it still could be a HW issue (I have experienced this with two > random keyboards I used for testing), but I'd guess it would be something > different than what you describe. What do you think? I don't know. Perhaps there's some strange interaction with the parent hub? It would get autosuspended 2 seconds after the keyboard, unless there was some other unsuspended USB device plugged into it. You can prevent the parent hub from being autosuspended by doing: echo on >/sys/bus/usb/devices/D/power/level where D is the device name of the parent hub. Try various combinations to see what works. Alan Stern ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ [email protected] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel