From: Robin Gareus <robin@xxxxxxxxxx> Date: Sun, 13 May 2012 20:15:49 +0200 > On 05/13/2012 07:45 PM, plutek wrote: >> From: Robin Gareus <robin@xxxxxxxxxx> >> Date: Sun, 13 May 2012 08:57:26 +0200 >> >>> On 05/13/2012 03:13 AM, plutek wrote: >>>> From: Karsten Wiese <fzuuzf@xxxxxxxxxxxxxx> >>>> Date: Sat, 12 May 2012 23:18:22 +0200 >>>> >>>>> 2012/5/12 Clemens Ladisch <clemens@xxxxxxxxxx>: >>>>>> plutek wrote: >>>>>>> i've been running AVLinux5.0.3 on a ThinkPad T61p for a while now.... >>>>>>> with an ART USB Dual Tube Pre, i can run Jack at 64 frames, 2 periods >>>>>>> >>>>>>> now i've got a new ThinkPad T520, and if i start jack on USB at 64*2 >>>>>>> i get hundreds of xruns in seconds. >>>>>> >>>>>> Both machines run (I assume) the same software? Then the problem is >>>>>> with the hardware, or its drivers. >>>>>> >>>>>> Please show the output of lspci and the contents of /proc/interrupts. >>>>>> >>>>> >>>>> Thinkwiki says its got a QM67. That does USB 1.1 via the "Rate >>>>> matching hub" and EHCI. >>>>> I guess linux's hub driver is the culprit. >>>> >>>> hmmmm.... shame.... lenovo specs said, of course, "USB 2.0". >>>> mrph. >>>> >>>> any way around this currently? >>> >>> yes, >>> >>> http://lists.linuxaudio.org/pipermail/linux-audio-dev/2010-October/029511.html >> >> after i do: >> >> # cd /sys/bus/pci/drivers/ehci_hcd/ >> # echo -n 0000:00:1d.0 > unbind >> >> ...the USB audio device no longer shows up in qjackctl. >> >> did i misunderstand? > > No, not that I can tell. "0000:00:1d.0" is the USB hub/controller, right? yes. > The idea is to use the uhci_hcd (USB1) driver instead of ehci_hcd > (USB2). -- Maybe the module is not loaded? > > `lsmod | grep uhci_hcd` yeah... nothing. > If they're modules: `rmmod ehci_hcd; modprobe uhci_hcd`; that'll force > all USB ports into 1.X mode; may be worth a try before playing with > dedicated per port bindings. well, when i do that, this happens: rmmod ehci_hcd (lsmod shows neither ehci nor uhci) modprobe uhci_hcd (lsmod shows BOTH ehci and uhci) rmmod uhci_hcd (lsmod shows only ehci) (USB devices don't appear in qjackctl) i.e., it seems like USB devices show ONLY when ehci is loaded. > Anyway, there might be something else going on: as both Karsten and > Clemens noted, these "Intel Corporation Cougar Point [..] controllers > use a different driver" and "There have been fixes recently. Try > updating the kernel." yeah, i'm starting to play with more recent kernels.... so far nothing does any better! :-( cheers! .pltk. _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
