Re: reset low speed USB device using uhci_hcd
Gordon Messmer <[email protected]>
| Newsgroups | gmane.linux.usb.devel |
|---|---|
| Message-ID | <[email protected]> |
Alan Stern wrote: > On Tue, 13 Mar 2007, Gordon Messmer wrote: > >> 2.6.20 behaves the same. If I built a preemptible kernel, (with preempt >> the BKL) and the timer frequency is 1000 HZ, then the mouse has issues. >> If I build a kernel with a lower frequency, or with voluntary >> preemption at any timer frequency, I don't see the problem. > > This seems so unlikely, I have trouble believing it's not a hardware > problem. Have you tried using a different mouse? Or using your mouse on > a different computer? Maybe it is a hardware problem. I know that I'm not the only person affected, though none of the other people who are got anywhere with the issue. I have tried other mice with this PC. I have an old MS optical Intellimouse (the second worst mouse I've ever used), and a newer revision of the problematic Logitech BD-58, a BT-58. Both other mice work without issue. I've also tried the BD-58 in several other PCs, running the same kernels. Only this mouse, in this PC, with this specific kernel configuration manifests the problem. I could just walk away from the problem, but since the kernel configuration determines whether or not the problem occurs, it looks to me like a bug, and that's the kind of thing I have a hard time leaving behind. I guess that, from my point of view, if it's a hardware bug, it'd be nice to be able to tell users who come across the issue what they should be looking for. > What about if you turn on preemption but not preempt-BKL (shooting in the > dark)? I don't know, but I'll give it a shot. > Do you think the errors are correlated with, say, disk activity? I'll try watching iostat and usbmon output at the same time and see if anything looks suspicious. ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ [email protected] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel