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That 1.2A limit requires a good quality, well regulated 3A PSU into your 4B. If you have less, you'll get less.
Doesn't matter what voltage it was calculated at. For DC Watts = Amps x Volts. So 3.5W at 5V is 0.7A or 700mA
Windows has different drivers to Linux. Some UAS chipsets will work just fine on Windows but fail or be buggy on Linux. I'm not aware of a definitive list of them.
Can't comment on that.
I wouldn't entirely rule it out. Lower speed can mean less power used.
Sorry, I have no idea what's going on there.
Sorry, but I'm not sure what else to suggest. Are any USB3 devices correctly detected in a USB 3 (blue) host port on the 4B?
Thank you, it's crystal clear right now. Would you be so kind and clarify the nvme in an enclosure problem. I read few of your post regarding nvme and rasberrypi.
1/ i am aware the limitation of 1.2 a /5v which is 6W power for ALL port combined together
That 1.2A limit requires a good quality, well regulated 3A PSU into your 4B. If you have less, you'll get less.
2/ nvme enclosure i don't know the power consumption but it's ugreene (RTL910B) based enclosure i think it's not power hungry.
```
=== START OF INFORMATION SECTION ===
Model Number: INTEL SSDPEKNW512G8L
Serial Number: BTNH93310F9Y512A
Firmware Version: L02C
PCI Vendor/Subsystem ID: 0x8086
IEEE OUI Identifier: 0x5cd2e4
Controller ID: 1
NVMe Version: 1.3
Number of Namespaces: 1
Namespace 1 Size/Capacity: 512 110 190 592 [512 GB]
Namespace 1 Formatted LBA Size: 512
Namespace 1 IEEE EUI-64: 5cd2e4 3891c09b51
Local Time is: Sat Aug 30 17:40:24 2025 CEST
Firmware Updates (0x14): 2 Slots, no Reset required
Optional Admin Commands (0x0017): Security Format Frmw_DL Self_Test
Optional NVM Commands (0x005f): Comp Wr_Unc DS_Mngmt Wr_Zero Sav/Sel_Feat Timestmp
Log Page Attributes (0x0f): S/H_per_NS Cmd_Eff_Lg Ext_Get_Lg Telmtry_Lg
Maximum Data Transfer Size: 32 Pages
Warning Comp. Temp. Threshold: 77 Celsius
Critical Comp. Temp. Threshold: 80 Celsius
Supported Power States
St Op Max Active Idle RL RT WL WT Ent_Lat Ex_Lat
0 + 3.50W - - 0 0 0 0 0 0
```
My disk shows 3.5W max power consumption (hope it's calculated for 5v)
Doesn't matter what voltage it was calculated at. For DC Watts = Amps x Volts. So 3.5W at 5V is 0.7A or 700mA
3. I have good quality USB-C cables
4. The exposure and nvme disk connected to windows usb 3.0 port give me over 800Mb/s read speed.
Windows has different drivers to Linux. Some UAS chipsets will work just fine on Windows but fail or be buggy on Linux. I'm not aware of a definitive list of them.
5. i upgrade firmawre for the enclosure to 1.34.xxxx the newest i could find for RTL, used config provided for this enclosure:
Can't comment on that.
to sum it up i don't think it's a power lack problem the enclosure is detected as USB 2.0 not 3.0
I wouldn't entirely rule it out. Lower speed can mean less power used.
```
2.885110] hub 1-1:1.0: USB hub found
[ 3.179883] usb 1-1.1: new high-speed USB device number 3 using xhci_hcd
[ 3.282772] usb 1-1.1: New USB device found, idVendor=0bda, idProduct=9210, bcdDevice=22.1d
[ 3.291888] usb 1-1.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 3.299940] usb 1-1.1: Product: Ugreen Storage Device
[ 3.305732] usb 1-1.1: Manufacturer: Ugreen
[ 3.310643] usb 1-1.1: SerialNumber: 0129380003DD
[ 3.349865] usb-storage 1-1.1:1.0: USB Mass Storage device detected
[ 3.357125] usb-storage 1-1.1:1.0: Quirks match for vid 0bda pid 9210: 800000
```
using usb-storage not usg i tried to play with osme quirks for the devies but i gave up. Not sure what is causing the problem btw. i own also a USB 3.1 external powered HUB and it's also detected as USB 2.0 HUB.
Sorry, I have no idea what's going on there.
i addes also more debug options to usb
pi@raspberrypi:~ $ cat /boot/cmdline.txt
console=serial0,115200 console=tty1 root=PARTUUID=96fdc4f9-e9a4-488a-a229-cd34535164f2 rootfstype=ext4 rootwait rootdelay=10 xhci_pci.debug=5 usb-storage.debug=1 usb-storage.quirks=0bda:9210:u
but nothing important showed up in the logs - thought there will be sth about negotiating the superspeed connection and faling back to usb2.0 but there is nothing about it.
```
0.840496] usbcore: registered new interface driver lan78xx
[ 0.840545] usbcore: registered new interface driver smsc95xx
[ 0.841824] xhci_hcd 0000:01:00.0: enabling device (0000 -> 0002)
[ 0.841935] xhci_hcd 0000:01:00.0: xHCI Host Controller
[ 0.841966] xhci_hcd 0000:01:00.0: new USB bus registered, assigned bus number 1
[ 0.843064] xhci_hcd 0000:01:00.0: hcc params 0x002841eb hci version 0x100 quirks 0x0300240000000890
[ 0.844370] xhci_hcd 0000:01:00.0: xHCI Host Controller
[ 0.845071] xhci_hcd 0000:01:00.0: new USB bus registered, assigned bus number 2
[ 0.845777] xhci_hcd 0000:01:00.0: Host supports USB 3.0 SuperSpeed
2.636495] mmc0: SDHCI controller on fe340000.mmc [fe340000.mmc] using ADMA
[ 2.719884] usb 1-1: new high-speed USB device number 2 using xhci_hcd
[ 2.862505] usb 1-1: New USB device found, idVendor=2109, idProduct=3431, bcdDevice= 4.21
[ 2.871435] usb 1-1: New USB device strings: Mfr=0, Product=1, SerialNumber=0
[ 2.879324] usb 1-1: Product: USB2.0 Hub
[ 2.885110] hub 1-1:1.0: USB hub found
[ 2.889813] hub 1-1:1.0: 4 ports detected
[ 3.179883] usb 1-1.1: new high-speed USB device number 3 using xhci_hcd
[ 3.282772] usb 1-1.1: New USB device found, idVendor=0bda, idProduct=9210, bcdDevice=22.1d
[ 3.291888] usb 1-1.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 3.299940] usb 1-1.1: Product: Ugreen Storage Device
[ 3.305732] usb 1-1.1: Manufacturer: Ugreen
[ 3.310643] usb 1-1.1: SerialNumber: 0129380003DD
[ 3.349865] usb-storage 1-1.1:1.0: USB Mass Storage device detected
[ 3.357125] usb-storage 1-1.1:1.0: Quirks match for vid 0bda pid 9210: 800000
```
Sorry, but I'm not sure what else to suggest. Are any USB3 devices correctly detected in a USB 3 (blue) host port on the 4B?
Statistics: Posted by thagrol — Sat Aug 30, 2025 5:42 pm