Alan Stern wrote: > On Wed, 14 Mar 2007, Gordon Messmer wrote: > >> 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. > > That sounds like a hardware problem to me.
OK. It still bothers me that only a preemptible kernel would be able to see this hardware problem. I don't know why that should be. >>> 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. No, it still has problems if I disable the preempt-BKL option. >>> 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. > > My thought was that some other sort of electrical activity on the > motherboard might interfere with the USB signals. Disk activity was just > a guess; it could be anything. I've tried killing off all of the active processes but sshd. The only thing that stops the errors is killing gpm and Xorg. I guess it's not surprising that if no processes have /dev/input/mice open, then there's nothing printed by usbmon? I did notice that when gpm opens the device, this appears in usbmon: f7c9b840 3783825882 C Ii:003:01 -2 0 f7c9b840 3806163653 S Ii:003:01 -115 4 < And when it closes the device: f7c9b840 3808386058 C Ii:003:01 -2 0 Those are normal, presumably? I'll probably try logging in locally just to see, but even when there's no disk activity, and gpm is nearly the last userspace process running, the I/O errors continue at more or less the same interval. ------------------------------------------------------------------------- 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 _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
