On Thu, May 26, 2011 at 04:45:38PM -0700, Sarah Sharp wrote: > diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt > index 7c6624e..67f2da2 100644 > --- a/Documentation/kernel-parameters.txt > +++ b/Documentation/kernel-parameters.txt > @@ -2722,6 +2722,15 @@ bytes respectively. Such letter suffixes can also be entirely omitted. > the unplug protocol > never -- do not unplug even if version check succeeds > > + xhci_switch_mask= [USB] > + Format: bitmap of ports to switch over from EHCI to xHCI > + during early boot and system resume from hibernate. > + If this kernel parameter is set to zero and the xHCI > + BIOS option is set to "disabled" or "auto", all ports > + under the xHCI host controller on some Intel chipsets > + will be disabled, and USB 3.0 devices will show up at > + USB 2.0 speeds under the EHCI host controller. > + Ick, no, I really don't want a new command line option for this. Can't we handle this dynamically somehow? Otherwise the distros are all going to have to add logic for this to their installer to change the kernel command line and that will take forever to get implemented. Why wouldn't we just want this to work "properly" all the time on this hardware and always use the ports in XHCI mode as we do have a working driver for this, unlike other operating systems :) thanks, greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
