On Tuesday, June 7, 2016 at 4:41:15 AM UTC-4, Ilpo Järvinen wrote: > On Mon, 6 Jun 2016, [email protected] wrote: > > > In order to have 3 usb controllers the only board I have found where > > this might be possible is with a 2011 socket board, and a board that > > has a bios that gives the ability to manually route the controllers. > > But who knows how compatible with linux the newer boards are at the > > moment, might run into other problems since not many people using them > > yet. > > Can you point me to some example motherboard? I've looked more than dozen > X99/C612 board manuals recently but I've not come across one so far with > such options. I'd be interested in seeing the bios part of the > motherboard's manual. Or do you refer to Sandybridge/Ivybridge MBs with > the "2011 socket"? If such a board really exists, it would further > reinforce that it may be possible also for the OS to play with > the forwarding (such forwarding forcing code already exists in Linux > XHCI driver anyway, it's just a question if the supported mask has > any/all bits enabled or not). If forwarding can be manipulated > successfully, then superspeed would not need to be disabled to > differentiate the USB ports to different controllers. > > Usually the manuals I've seen list only "legacy USB support", etc. > toggleable options. Although given the naming, I wouldn't be surprised > if some of those more standard bios options could be used to disable the > auto-forwarding. According to my understanding the reason behind > the forwarding is that if OS doesn't have necessary device drivers for > one of the controllers some of the ports wouldn't work, which would be > too confusing to many users. > > > -- > i.
Most modern boards give you the option to shut off the usb 3.0. This "usually" means all the usb 3.0 ports will then become 2.0 ports. (and you will get two controllers as i described above) Here is a cheaper 2011 board with the manual routing option, and also an option to just not route to xhci which looks interesting. Gigabyte GA-X99-UD3P LGA 2011 It has intel vt, although it says its disabled by default. Most gigabyte boards have it enabled by default so that would worry me. But might be meaningless. Are you referring to the handoffs when you say forwarding for os without drivers? I always shut all that off never had a problem. -- You received this message because you are subscribed to the Google Groups "qubes-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/qubes-users/fe5996e6-97d7-4c95-a4cf-3fc80e7b03f1%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
