"The hub operates like any USB 2.0 Discrete Hub and will consume one tier of hubs
allowed by the USB 2.0 Spec. section 4.1.1. A maximum of four additional non-root
hubs can be supported on any of the PCH USB Ports. The RMH will report the following
Vendor ID = 8087h and Product ID = 0020h."
This might be a dup of 522998. However, in my case, I don't have XHCI loaded and
see this bug in say 1 out of every 10 suspend cycles.
<03:38:11>~$ lspci -nn -k | grep -B1 hci_hcd
00:1a.0 USB Controller [0c03]: Intel Corporation 5 Series/3400 Series Chipset USB2 Enhanced Host Controller [8086:3b3c] (rev 06)
Kernel driver in use: ehci_hcd
--
00:1d.0 USB Controller [0c03]: Intel Corporation 5 Series/3400 Series Chipset USB2 Enhanced Host Controller [8086:3b34] (rev 06)
Kernel driver in use: ehci_hcd
So this bug effects both xhci and ehci controllers, just to different degrees.
Since this is compiled into the kernel, the blacklist work around doesn't help here.
According to the updated usb ids database, this device is a "integrated rate matching hub", whatever that means.
http:// www.linux- usb.org/ usb.ids
8087 Intel Corp.
0020 Integrated Rate Matching Hub
I think it's part of the Intel 3400 chipset, which my T510 thinkpad has.
http:// www.intel. com/products/ server/ chipsets/ 3400-3420/ 3400-3420- overview. htm
http:// www.intel. com/Assets/ PDF/datasheet/ 322169. pdf -- Section 5.19
"The hub operates like any USB 2.0 Discrete Hub and will consume one tier of hubs
allowed by the USB 2.0 Spec. section 4.1.1. A maximum of four additional non-root
hubs can be supported on any of the PCH USB Ports. The RMH will report the following
Vendor ID = 8087h and Product ID = 0020h."
This might be a dup of 522998. However, in my case, I don't have XHCI loaded and
see this bug in say 1 out of every 10 suspend cycles.
<03:38:11>~$ lspci -nn -k | grep -B1 hci_hcd
00:1a.0 USB Controller [0c03]: Intel Corporation 5 Series/3400 Series Chipset USB2 Enhanced Host Controller [8086:3b3c] (rev 06)
Kernel driver in use: ehci_hcd
--
00:1d.0 USB Controller [0c03]: Intel Corporation 5 Series/3400 Series Chipset USB2 Enhanced Host Controller [8086:3b34] (rev 06)
Kernel driver in use: ehci_hcd
So this bug effects both xhci and ehci controllers, just to different degrees.
Since this is compiled into the kernel, the blacklist work around doesn't help here.