Hi, I just bought a Silverstone Treasure TS04B external case. I thought it will be based on ASMedia1051 chip but maybe because of the 'B' at the end ... ? When I read from a SATAII disk placed into the casing I read at about 32MB/s (from raw disk -- dd if=/dev/sdc of=/dev/null) when having connected it to either internal Texas Instruments USB3.0 chip or to a NEC USB3.0 chip in an Express Card. I conclude this is not an issue with the host controller chipset in my laptop Dell Vostro 3550 or the Express card but an issue with xhci_hcd or the ASMedia2105 chip. That was with 3.3.4 kernel. I found something on the internet reported by people having an onboard ASMedia controller which can be switched by BIOS from XHCI to EHCI .. I do not understand whether that relates to me or not. Aside from the fact that I have the ASMedia chip in the "client" device (a HDD enclosure). If I look into the "lsusb -t" output I see the device is at 480Mbps. Why? I rebooted into 3.4-rc5 and first, connected the enclosure to the TexasInstruments USB3 port. This gave me: [ 92.996770] usb 3-2: new high-speed USB device number 2 using xhci_hcd [ 93.056517] xhci_hcd 0000:0b:00.0: device LPM test failed, may disconnect and re-enumerate [ 93.064234] usb 3-2: New USB device found, idVendor=174c, idProduct=5106 [ 93.064245] usb 3-2: New USB device strings: Mfr=2, Product=3, SerialNumber=1 [ 93.064252] usb 3-2: Product: AS2105 [ 93.064257] usb 3-2: Manufacturer: ASMedia [ 93.064262] usb 3-2: SerialNumber: WD-WX51C10U8155 [ 93.064436] usb 3-2: ep 0x81 - rounding interval to 32768 microframes, ep desc says 0 microframes [ 93.064443] usb 3-2: ep 0x2 - rounding interval to 32768 microframes, ep desc says 0 microframes [ 93.065037] scsi7 : usb-storage 3-2:1.0 but I wasn't catching the USB trafiic, so you only see in the attached dmesg output. On next two re-plkugs of the device it did not happen. Then I unpugged it, started usbmon to catch traffic on the same port (the port remained in the 480Mbps mode, claimed by xhci_hcd). I ran smartctl to fetch some SMART data from the disc and unplugged it again. The recorded file is named 3.4-rc5-ASMedia2105_via_Texas_instruments_Bus3_reporting_480Mbps.usbmon.out and logs are in 3.4-rc5-ASMedia2105_via_Texas_instruments_Bus3_reporting_480Mbps.txt. Then, I saw the other port coming out from the Texas Instruments chip is still in 5Gbps mode, so I started to record USB traffic again, connected the enclosure to that port and likewise, it is in 3.4-rc5-ASMedia2105_via_Texas_instruments_Bus4_reporting_5Gbps.usbmon.out and logs in 3.4-rc5-ASMedia2105_via_Texas_instruments_Bus4_reporting_5Gbps.txt. I hope you can infer something from them as I will probably return the external enclosure and go for the "old" ASMedia1051 in Silvertsone RVS02 (if I am lucky to grab the right piece). Whats of interest in the ASMedia2005 chip, btw? (I can repeat the test with NEC Corporation uPD720200 USB 3.0 if you want). Thanks for clues, Martin -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
