On 06/24/2021 02:31 AM, shachar J. brown wrote:
Hi everyone,
I am trying to run the given tx_samples_from_file example.
Unfortunately, I keep receiving the uhd::usb_error, approximately 5-30
minutes into the run.
*Technical specs:*
USRP: B210.
Host: Intel Nuc, Core i7, 8th gen.
OS: Ubuntu 20
UHD Version: 4.1.0
USB Controler: XHCI (USB3).
*Error print:
*
[ERROR] [TX-STREAM] The tx_stream timed out sending 5000 samples (4080
sent).
[ERROR] [UHD] An unexpected exception was caught in a task loop.The
task loop will now exit, things may not work.EnvironmentError:
IOError: usb rx8 transfer status: LIBUSB_TRANSFER_NO_DEVICE
terminate called after throwing an instance of 'uhd::usb_error'
what(): RuntimeError: USBError -4: usb tx4 submit failed:
LIBUSB_ERROR_NO_DEVICE
Aborted (core dumped)
*dmesg output:
*
[19924.922965] usb 4-2: USB disconnect, device number 7
[19925.195595] usb 4-2: new SuperSpeed Gen 1 USB device number 8 using
xhci_hcd
[19925.217437] usb 4-2: LPM exit latency is zeroed, disabling LPM.
[19925.220417] usb 4-2: New USB device found, idVendor=2500,
idProduct=0020, bcdDevice= 0.00
[19925.220422] usb 4-2: New USB device strings: Mfr=1, Product=2,
SerialNumber=3
[19925.220426] usb 4-2: Product: USRP B200
[19925.220429] usb 4-2: Manufacturer: Ettus Research LLC
[19925.220431] usb 4-2: SerialNumber: 31F80A2
Is anyone familiar with this fault?
I would appreciate any help on the matter.
Thanks in advance,
Steve
My guess is that your NUC USB controller is unhappy with power
consumption. Are you using external power on the B2xx, or relying
on USB3 power?
Also, several years ago, there was an interaction between certain
controllers and kernel power-saving features that caused the
controller to disconnect stuff even if it was being used. But I
can't for the live of me remember which driver parameter one
had to change to fix this. It has been several years since this was
a problem.
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