Hello, I have an external disk enclosure called "Mercury Elite Pro Dual" from OWC holding 2 disks that doesn't seem to work when connected via USB 3 to a Thinkpad E431 laptop, see below. Notice how the 2nd disk in the enclosure (sdd) gets "Attached" only later, but is then detached again. I found a posting on linux-usb[0] from August 2019 and adding the ":u" quirk[1] (US_FL_IGNORE_UAS) worked in my case as well: options usb-storage quirks=1e91:a3a8:u I have yet to test with a more current kernel (I'm on 4.19.80 now), but as I couldn't find the vendor (0x1e91) listed in drivers/usb/storage/unusual_devs.h, I wanted to report this to the list too. Thanks for reading, and thanks Julian to mention the quirks option, that saved quite a bit of digging! Christian. === Full dmesg: https://paste.debian.net/1111925/ scsi host6: uas usbcore: registered new interface driver uas scsi 6:0:0:0: Direct-Access ElitePro Dual U3FW-1 0207 PQ: 0 ANSI: 6 scsi 6:0:0:1: Direct-Access ElitePro Dual U3FW-2 0207 PQ: 0 ANSI: 6 sd 6:0:0:0: [sdc] 7814037168 512-byte logical blocks: (4.00 TB/3.64 TiB) sd 6:0:0:1: [sdd] 7814037168 512-byte logical blocks: (4.00 TB/3.64 TiB) sd 6:0:0:0: [sdc] Write Protect is off sd 6:0:0:0: [sdc] Mode Sense: 67 00 10 08 sd 6:0:0:1: [sdd] Write Protect is off sd 6:0:0:1: [sdd] Mode Sense: 67 00 10 08 sd 6:0:0:0: [sdc] Write cache: enabled, read cache: enabled, supports DPO and FUA sd 6:0:0:1: [sdd] Write cache: enabled, read cache: enabled, supports DPO and FUA sd 6:0:0:0: [sdc] Optimal transfer size 33553920 bytes sd 6:0:0:0: [sdc] Attached SCSI disk [...] sd 6:0:0:1: tag#0 uas_eh_abort_handler 0 uas-tag 1 inflight: IN sd 6:0:0:1: tag#0 CDB: opcode=0x12 12 01 00 00 40 00 scsi host6: uas_eh_device_reset_handler start usb 4-3: reset SuperSpeed Gen 1 USB device number 2 using xhci_hcd usb 4-3: device firmware changed scsi host6: uas_eh_device_reset_handler FAILED err -19 sd 6:0:0:1: Device offlined - not ready after error recovery sd 6:0:0:1: [sdd] Optimal transfer size 33553920 bytes usb 4-3: USB disconnect, device number 2 sd 6:0:0:1: [sdd] Attached SCSI disk sd 6:0:0:0: [sdc] Synchronizing SCSI cache sd 6:0:0:0: [sdc] Synchronize Cache(10) failed: Result: hostbyte=0x07 driverbyte=0x00 sd 6:0:0:1: [sdd] Synchronizing SCSI cache sd 6:0:0:1: [sdd] Synchronize Cache(10) failed: Result: hostbyte=0x07 driverbyte=0x00 [0] Lacie Rugged USB3-FW does not work with UAS https://lore.kernel.org/linux-usb/1566567572.8347.54.camel@xxxxxxxx/T/ [1] SDB:USB 3.0 Hard Drive troubleshooting https://en.opensuse.org/SDB:USB_3.0_Hard_Drive_troubleshooting -- BOFH excuse #70: nesting roaches shorted out the ether cable
