On Mon, Feb 22, 2021 at 11:24:18AM +0100, Oliver Neukum wrote: > Am Freitag, den 19.02.2021, 20:52 +1030 schrieb Jonathan Woithe: > > > Since some people have reported success with ASMedia cards if the uas driver > > is prevented from loading, I tried this too. > > > > rmmod uas > > rmmod usb-storage > > modprobe usb-storage quirks=04e8:61f5:u > > this rules out an issue with UAS. > > > This still ended in failure along similar lines: > > > > usb 4-1: new SuperSpeedPlus Gen 2 USB device number 3 using xhci_hcd > > usb-storage 4-1:1.0: USB Mass Storage device detected > > usb-storage 4-1:1.0: Quirks match for vid 04e8 pid 61f5: 800000 > > scsi host10: usb-storage 4-1:1.0 > > usb 4-1: reset SuperSpeedPlus Gen 2 USB device number 3 using xhci_hcd (x6) > > sd 10:0:0:0: [sdd] tag#0 UNKNOWN(0x2003) Result: hostbyte=0x07 driverbyte=0x00 cmd_age=0s > > sd 10:0:0:0: [sdd] tag#0 CDB: opcode=0x2a 2a 00 23 1c 34 30 00 02 00 00 > > > > After 7 repeats of the above sequence the operation failed. > > > > It may be helpful to know that the same 500 GB SSD does work on a different > > machine when connected to usbc or usb3 ports with kernel 4.4.19. These > > ports on that machine are provided by a mainboard host controller: > > Is it bus powered or self powered? Both the 250 GB drive (which works well) and the 500 GB drive (which doesn't) are Samsung T5 SSDs. They are bus powered. There is no separate power input socket on these SSDs. > It is possible that the other machine can just supply more power. On the machine with the ASMedia controller (where the problem occurs), the 500 GB SSD works perfectly well when connected to USB2 sockets. If a USB2 socket can supply sufficient power, wouldn't a USB3 port be more than capable? The specifications for both the 250 GB (working) and 500 GB (not working) are 5V at 0.8A. I'm guessing this is a worst-case scenario. In any case, this is well within the capabilities of a USB3 port. If there was a power issue with one of these drives it's surprising it's not seen in both - unless the 250 GB is just under the critical power threshold and the 500 GB is just above it. Is there an easy way to tell if this is indeed the case? Regards jonathan
