Re: reset low speed USB device using uhci_hcd
Alan Stern <[email protected]>
| Newsgroups | gmane.linux.usb.devel |
|---|---|
| Message-ID | <[email protected]> |
On Thu, 15 Mar 2007, Gordon Messmer wrote: > Pete Zaitcev wrote: > > > > It's probably BIOS or ACPI. In theory, SMM should be unfazed by whatever > > OS does, but in practice perhaps our timer programming does something > > to it. But usually ACPI code is affected the most when HZ is bumped up, > > because it runs in kernel mode and thus is a subject to kernel changes. > > It's rare to see ACPI running periodic tasks, but stranger things happened. > > There's a mode when ACPI interpreter is disabled, and we only use ACPI > > tables for IRQ routing. I forgot details, sorry. But it may be something > > to try. > > I still see the errors when I disable ACPI in the kernel configuration. Take a look at your BIOS settings for USB. In particular, if there's a setting for USB Legacy device support, try turning it off. Alan Stern ------------------------------------------------------------------------- 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