Messages in this thread | | | Date | Wed, 02 Jan 2013 08:41:11 -0500 | From | Woody Suwalski <> | Subject | Re: Linux 3.8-rc1 - another regression on USB :-( |
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Greg Kroah-Hartman wrote: > On Sun, Dec 23, 2012 at 02:35:49PM -0800, Linus Torvalds wrote: >> Woody, >> Any chance you can bisect this? It's not going to be hugely pleasant >> (with 11k+ commits in between 3.7 and 3.8-rc1 you'll have to compile >> and test at least 14 kernels), but it would help enormously. Of >> course, maybe some USB person can guess what would cause the device to >> go offline.. >> >> Added Greg and the linux-usb mailing list to the participants list: >> the images are in the original email on lkml, but there isn't anything >> particularly interesting there, it really just seems to be an >> unexpected and spurious USB disconnect, resulting in "USB disconnect, >> device number 2" followed by "Rejecting I/O to offline device". > I don't see any images on lkml, sorry. > > The kernel log for when the disconnect happened would be great to get. > > The kernel can't cause a device to disconnect, that's an electrical > thing usually, is this perchance a flaky device/connection? Or has it > always worked on older kernels? > > What host controller is being used here (xhci, ehci, etc.?) > > thanks, > > greg k-h Greg, Linus, It sounds insane, but after banging on the issue I have found out that USB problem is caused (also in vanilla kernel) with a config change: USB-all built as modules - bad USB USB core built in, UHCI/EHCI modules - semi functional - but 1Mb/s transfer USB core and UHCI EHCI built-in - bingo - no issues.
Could anybody duplicate that, or is it somehow my setup???
Thanks, Woody
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