Full speed (ehci) devices are not working for me under 2.6.27.2-23.rc1.fc10.x86_64 Sames devices work fine with kernel-2.6.27-0.352.rc7.git1.fc10.i686 Error is a timeout: Oct 19 09:24:47 i kernel: usb 2-5: device descriptor read/64, error -110 Oct 19 09:25:03 i kernel: hub 2-0:1.0: unable to enumerate USB device on port 5 Oct 19 09:25:13 i kernel: uvcvideo: Failed to query (135) UVC control 2 (unit 2) : -110 (exp. 2). Sometimes (not always) the kernel decides to drop back to full speed (OHCI) which then works. Hardware is AMD 790GX / SB750 chipset: 00:12.2 USB Controller [0c03]: ATI Technologies Inc SB700/SB800 USB EHCI Controller [1002:4396] 00:13.0 USB Controller [0c03]: ATI Technologies Inc SB700/SB800 USB OHCI0 Controller [1002:4397]
Most likely interrupt routing went bad (these days it's governed by ACPI tables). Please capture dmesg with dmesg > ok.dmesg for 2.6.27-0.352.rc7.git1.fc10 and dmesg > bad.dmesg for 2.6.27.2-23.rc1.fc10, then attach both. It should give us a clue where the difference is. The /var/log/messages may miss some information, I think dmesg is better. Chuck, I'm not taking this bug yet, I know about IRQ routing as much as a pig knows about oranges.
Created attachment 320780 [details] dmesg from current (broken) kernel
Created attachment 320781 [details] Dmesg from older working kernel.
Interestingly, current i686 kernel (2.6.27.2-23.rc1.fc10.i686) does seem to work. So it looks like the difference is i686 v. x86-64.
This bug appears to have been reported against 'rawhide' during the Fedora 10 development cycle. Changing version to '10'. More information and reason for this action is here: http://fedoraproject.org/wiki/BugZappers/HouseKeeping
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Has been working again for ages.