Hi all, trying to push my LimeSDR mini to the max, I’ve been playing with sdrangel and noticed that above 14MS/s I started getting Dropped frames, at about an indicated throughput of 45.056 MB/s. That hint made me check the USB speed and indeed I found out the LimeSDR mini was connected at 480Mbps.
The strange thing is that lsusb says
SuperSpeed USB Device Capability:
- bLength 10*
- bDescriptorType 16*
- bDevCapabilityType 3*
- bmAttributes 0x00*
- wSpeedsSupported 0x000e*
Device can operate at Full Speed (12Mbps)*
Device can operate at High Speed (480Mbps)*
Device can operate at SuperSpeed (5Gbps)*
- bFunctionalitySupport 2*
Lowest fully-functional device speed is High Speed (480Mbps)*
- bU1DevExitLat 10 micro seconds*
- bU2DevExitLat 2047 micro seconds*
Device Status: 0x0001
- Self Powered*
which would make me think it is capable of 5Gbps, but for some reason I cannot access that speed.
In order to make sure the port on my Dell Elitebook 840 was working ok, I connected a USB3 SSD which was correctly recognized and connected at 5Gbps.
I am running Ubuntu 18.04.3 LTS and kernel is
4.15.0-58-generic #64-Ubuntu SMP Tue Aug 6 11:12:41 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
Anyone has an idea about this problem and what could cause this?