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+graphic: 0.557
+mistranslation: 0.516
+i386: 0.422
+semantic: 0.402
+device: 0.369
+performance: 0.362
+x86: 0.342
+architecture: 0.316
+permissions: 0.289
+PID: 0.275
+network: 0.271
+peripherals: 0.256
+user-level: 0.237
+register: 0.217
+socket: 0.176
+files: 0.171
+debug: 0.155
+kernel: 0.136
+ppc: 0.134
+hypervisor: 0.126
+assembly: 0.122
+boot: 0.113
+vnc: 0.108
+arm: 0.097
+virtual: 0.081
+risc-v: 0.075
+TCG: 0.043
+VMM: 0.037
+KVM: 0.037
+
+connect low speed host devices to qemu ehci does not work
+
+$ qemu-system-i386 -hda my_x86.img -device ich9-usb-ehci1,id=ehci -device usb-host,vendorid=0x045e,productid=0x071d -serial stdio
+qemu-system-i386: Warning: speed mismatch trying to attach usb device "Microsoft? 2.4GHz Transceiver V" ( speed) to bus "ehci.0", port "1" (high speed)
+qemu-system-i386: Warning: speed mismatch trying to attach usb device "Microsoft? 2.4GHz Transceiver V" ( speed) to bus "ehci.0", port "1" (high speed)
+qemu-system-i386: Warning: speed mismatch trying to attach usb device "Microsoft? 2.4GHz Transceiver V" ( speed) to bus "ehci.0", port "1" (high speed)
+
+Which is obviously wrong. The ehci specification states:
+
+Low-speed device, release ownership of port <= Table 2-16.
+
+Table 2-6:
+
+Number of Companion Controller (N_CC). This field indicates the number of
+companion controllers associated with this USB 2.0 host controller.
+A zero in this field indicates there are no companion host controllers. Port-ownership
+hand-off is not supported. Only high-speed devices are supported on the host controller
+root ports.
+A value larger than zero in this field indicates there are companion USB 1.1 host
+controller(s). Port-ownership hand-offs are supported. High, Full- and Low-speed
+devices are supported on the host controller root ports.
+
+Which is not longer true, as for example skylake and baytrail offers a dual usb stack of ehci and xhci. In that case, EHCI handles the low speed device as well.
+
+brgds,
+Bert
+
+Are you sure that EHCI handles low-speed devices in that case? I thought that XHCI is capable of handling low-speed devices instead...
+Anyway, QEMU certainly only emulates the EHCI in a traditional way, so if you want to use low-speed devices here, you also have to specify an UHCI controller for them. I.e. as far as I can see, this is not a bug in QEMU, but just a configuration issue.
+