Upgrading from v1.7.1 → v1.7.3 seems to have provoked extreme USB access degradation on my Raspberry Pi 4 B 8GB DIY node. The upgrade seemed to fail, and the Umbrel automatically switched back to the v1.7.1 installation, but disk access was extremely slow and provoked 100% I/O wait on the CPUs.
I noticed in @DarthCoin 's troubleshooting guide that debug complaints about “UAS blacklisting” can be a problem. In my case, the debug script did not complain about UAS, but I did see two messages about “UAS ignored” in my dmesg output. Is this the problem? If so, any ideas how to resolve it?
I tried re-upgrading to v1.7.3, but the issue persisted. I tried flashing a new micro-SD card with v1.7.3, but the issue still persists. Any ideas about how I might further troubleshoot or resolve this?
Here is some of the dmesg output, including the “UAS ignored” messages:
umbrel@umbrel:~/umbrel$ dmesg -T | grep -iE 'usb|sda'
[Wed May 20 13:42:15 2026] Kernel command line: coherent_pool=1M 8250.nr_uarts=0 snd_bcm2835.enable_headphones=0 cgroup_disable=memory numa_policy=interleave nvme.max_host_mem_size_mb=0 snd_bcm2835.enable_hdmi=0 smsc95xx.macaddr=E4:5F:01:0A:DE:47 vc_mem.mem_base=0x3ec00000 vc_mem.mem_size=0x40000000 console=ttyS0,115200 console=tty1 rootfstype=ext4 fsck.repair=yes rootwait cgroup_enable=memory swapaccount=1 loglevel=3 module_blacklist=esp4,esp6,rxrpc initcall_blacklist=algif_aead_init,esp4_init,esp6_init,af_rxrpc_init usb-storage.quirks=152d:1561:u,152d:1576:u,152d:0578:u,125f:a76a:u,04e8:61b6:u panic=60 root=PARTUUID=11D5B2CA-0A68-BA44-BB89-303A34CDB8A1 init=/usr/bin/rugix-ctrl
[Wed May 20 13:42:15 2026] usbcore: registered new interface driver usbfs
[Wed May 20 13:42:15 2026] usbcore: registered new interface driver hub
[Wed May 20 13:42:15 2026] usbcore: registered new device driver usb
[Wed May 20 13:42:16 2026] usbcore: registered new interface driver lan78xx
[Wed May 20 13:42:16 2026] usbcore: registered new interface driver smsc95xx
[Wed May 20 13:42:16 2026] xhci_hcd 0000:01:00.0: new USB bus registered, assigned bus number 1
[Wed May 20 13:42:16 2026] xhci_hcd 0000:01:00.0: new USB bus registered, assigned bus number 2
[Wed May 20 13:42:16 2026] xhci_hcd 0000:01:00.0: Host supports USB 3.0 SuperSpeed
[Wed May 20 13:42:16 2026] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 6.12
[Wed May 20 13:42:16 2026] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[Wed May 20 13:42:16 2026] usb usb1: Product: xHCI Host Controller
[Wed May 20 13:42:16 2026] usb usb1: Manufacturer: Linux 6.12.75+rpt-rpi-v8 xhci-hcd
[Wed May 20 13:42:16 2026] usb usb1: SerialNumber: 0000:01:00.0
[Wed May 20 13:42:16 2026] hub 1-0:1.0: USB hub found
[Wed May 20 13:42:16 2026] usb usb2: New USB device found, idVendor=1d6b, idProduct=0003, bcdDevice= 6.12
[Wed May 20 13:42:16 2026] usb usb2: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[Wed May 20 13:42:16 2026] usb usb2: Product: xHCI Host Controller
[Wed May 20 13:42:16 2026] usb usb2: Manufacturer: Linux 6.12.75+rpt-rpi-v8 xhci-hcd
[Wed May 20 13:42:16 2026] usb usb2: SerialNumber: 0000:01:00.0
[Wed May 20 13:42:16 2026] hub 2-0:1.0: USB hub found
[Wed May 20 13:42:16 2026] usbcore: registered new interface driver uas
[Wed May 20 13:42:16 2026] usbcore: registered new interface driver usb-storage
[Wed May 20 13:42:16 2026] usbcore: registered new interface driver usbhid
[Wed May 20 13:42:16 2026] usbhid: USB HID core driver
[Wed May 20 13:42:16 2026] usb 1-1: new high-speed USB device number 2 using xhci_hcd
[Wed May 20 13:42:16 2026] usb 1-1: New USB device found, idVendor=2109, idProduct=3431, bcdDevice= 4.21
[Wed May 20 13:42:16 2026] usb 1-1: New USB device strings: Mfr=0, Product=1, SerialNumber=0
[Wed May 20 13:42:16 2026] usb 1-1: Product: USB2.0 Hub
[Wed May 20 13:42:16 2026] hub 1-1:1.0: USB hub found
[Wed May 20 13:42:16 2026] usb 2-1: new SuperSpeed USB device number 2 using xhci_hcd
[Wed May 20 13:42:16 2026] usb 2-1: New USB device found, idVendor=152d, idProduct=0578, bcdDevice= 5.08
[Wed May 20 13:42:16 2026] usb 2-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[Wed May 20 13:42:16 2026] usb 2-1: Product: USB
[Wed May 20 13:42:16 2026] usb 2-1: Manufacturer: jmicron
[Wed May 20 13:42:16 2026] usb 2-1: SerialNumber: 0000000000080
[Wed May 20 13:42:16 2026] usb 2-1: UAS is ignored for this device, using usb-storage instead
[Wed May 20 13:42:16 2026] usb 2-1: UAS is ignored for this device, using usb-storage instead
[Wed May 20 13:42:16 2026] usb-storage 2-1:1.0: USB Mass Storage device detected
[Wed May 20 13:42:16 2026] usb-storage 2-1:1.0: Quirks match for vid 152d pid 0578: 1800000
[Wed May 20 13:42:16 2026] scsi host0: usb-storage 2-1:1.0
[Wed May 20 13:42:17 2026] scsi 0:0:0:0: Direct-Access USB 3.0 0508 PQ: 0 ANSI: 6
[Wed May 20 13:42:18 2026] sd 0:0:0:0: [sda] 4000797360 512-byte logical blocks: (2.05 TB/1.86 TiB)
[Wed May 20 13:42:18 2026] sd 0:0:0:0: [sda] Write Protect is off
[Wed May 20 13:42:18 2026] sd 0:0:0:0: [sda] Mode Sense: 47 00 00 08
[Wed May 20 13:42:18 2026] sd 0:0:0:0: [sda] Disabling FUA
[Wed May 20 13:42:18 2026] sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[Wed May 20 13:42:18 2026] sda: sda1
[Wed May 20 13:42:18 2026] sd 0:0:0:0: [sda] Attached SCSI disk
[Wed May 20 13:42:27 2026] usbcore: registered new interface driver brcmfmac
[Wed May 20 13:43:09 2026] EXT4-fs (sda1): mounted filesystem e52797d2-5b55-409d-8a79-9334a40d1b26 r/w with ordered data mode. Quota mode: none.
This is what the disk and CPU look like. Completely saturated by moving a couple of kilobytes per second over a pair of requests, or even by 0 requests:
