[LAU] Unbinding USB devices

Hi,

I've got a new mobo, it's a GIGABYTE GA-B85M-D3H.
It has got 8 "USB 2.0/1.1 ports"[1] and 2 "USB 3.0/2.0 ports"[1].
[1] Quoting the user's manual

Actually it provides 4 USB 3.0/2.0 ports, but only 2 are available at
the moment, since I don't have brackets/front panels for USB 3.0.

There are two ehci devices, one shares the IRQ with audio cards.

If I unbind the ehci device that shares the IRQ with audio cards, still
all 10 available USB ports work, but I get rid of sharing the IRQ with
USB.

Could somebody explain what this does mean? If I unbound ports on my
old mobo, they stopped working.

[rocketmouse@email-addr-hidden ~]$ rtirq status

  PID CLS RTPRIO NI PRI %CPU STAT COMMAND
  102 FF 90 - 130 0.0 S irq/16-ehci_hcd
  225 FF 90 - 130 0.0 S irq/27-xhci_hcd
  119 FF 89 - 129 0.0 S irq/23-ehci_hcd
  312 FF 85 - 125 0.0 S irq/16-snd_hdsp
  313 FF 80 - 120 0.0 S irq/16-snd_ice1
   38 FF 50 - 90 0.0 S irq/9-acpi
   52 FF 50 - 90 0.0 S irq/8-rtc0
  101 FF 50 - 90 0.0 S irq/1-i8042
  104 FF 50 - 90 0.4 S irq/25-ahci[000
  224 FF 50 - 90 0.0 S irq/26-mei_me
  227 FF 50 - 90 0.0 S irq/5-parport0
  229 FF 50 - 90 0.0 S irq/28-snd_hda_
  235 FF 50 - 90 0.0 S irq/30-i915
  314 FF 50 - 90 0.0 S irq/18-i801_smb
  315 FF 50 - 90 0.0 S irq/31-snd_hda_
  442 FF 50 - 90 0.0 S irq/29-enp3s0
    3 TS - 0 19 0.0 S ksoftirqd/0
   21 TS - 0 19 0.0 S ksoftirqd/1

[rocketmouse@email-addr-hidden ~]$ cd /sys/bus/pci/drivers/ehci-pci/
[rocketmouse@email-addr-hidden ehci-pci]$ ls -l | grep devices
lrwxrwxrwx 1 root root 0 Feb 19 17:00 0000:00:1a.0 -> ../../../../devices/pci0000:00/0000:00:1a.0
lrwxrwxrwx 1 root root 0 Feb 19 17:00 0000:00:1d.0 -> ../../../../devices/pci0000:00/0000:00:1d.0
[rocketmouse@email-addr-hidden ehci-pci]$ printf "0000:00:1a.0" | sudo tee unbind >/dev/null
[sudo] password for rocketmouse:
[rocketmouse@email-addr-hidden ehci-pci]$ ls -l | grep devices
lrwxrwxrwx 1 root root 0 Feb 19 17:00 0000:00:1d.0 -> ../../../../devices/pci0000:00/0000:00:1d.0
[rocketmouse@email-addr-hidden ehci-pci]$ rtirq status

  PID CLS RTPRIO NI PRI %CPU STAT COMMAND
  225 FF 90 - 130 0.0 S irq/27-xhci_hcd
  119 FF 89 - 129 0.0 S irq/23-ehci_hcd
  312 FF 85 - 125 0.0 S irq/16-snd_hdsp
  313 FF 80 - 120 0.0 S irq/16-snd_ice1
   38 FF 50 - 90 0.0 S irq/9-acpi
   52 FF 50 - 90 0.0 S irq/8-rtc0
  101 FF 50 - 90 0.0 S irq/1-i8042
  104 FF 50 - 90 0.1 S irq/25-ahci[000
  224 FF 50 - 90 0.0 S irq/26-mei_me
  227 FF 50 - 90 0.0 S irq/5-parport0
  229 FF 50 - 90 0.0 S irq/28-snd_hda_
  235 FF 50 - 90 0.0 S irq/30-i915
  314 FF 50 - 90 0.0 S irq/18-i801_smb
  315 FF 50 - 90 0.0 S irq/31-snd_hda_
  442 FF 50 - 90 0.0 S irq/29-enp3s0
    3 TS - 0 19 0.0 S ksoftirqd/0
   21 TS - 0 19 0.0 S ksoftirqd/1

Regards,
Ralf
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Received on Sun Feb 19 20:15:01 2017