Issues when testing DMA feature provided by Avalon MM+ IP with S10 GX dev kit card on Ubuntu 18.04

The issue is for both '0: Link test - 100 writes and reads" and "9: Perform DMA".

When the card works well, choose '0: Link test - 100 writes and reads" and get the result like this.

Doing 100 writes and 100 reads..
Number of write errors:       0
Number of read errors:        0
Number of dword mismatches:   0

Choose "9: Perform DMA" and get,

*********************************************************
Current DMA configurations
    Run Read  (card->system)  ? 1
    Run Write (system->card)  ? 1
    Run Simultaneous          ? 1
    Number of dwords/desc     : 2048
    Number of descriptors     : 128
    Total length of transfer  : 1e+03 KiB
*********************************************************
 0: Run DMA
 1: Toggle read DMA
 2: Toggle write DMA
 3: Toggle simultaneous DMA
 4: Set the number of dwords per descriptor
 5: Set the number of descriptors per DMA
 6: Return to main menu
*********************************************************

then "0 : Run DMA",

Enter the number of DMA operations to initiate; enter 0 for infinite loop:

Enter "2" and then get the result.

*********************************************************
Current DMA configurations
    Run Read  (card->system)  ? 1
    Run Write (system->card)  ? 1
    Run Simultaneous          ? 1
    Number of dwords/desc     : 2048
    Number of descriptors     : 128
    Total length of transfer  : 1e+03 KiB

Current run #: 2
Current time : Wed Mar 23 13:49:54 2022

DMA throughputs, in GB/s (10^9B/s)
    Current Read Throughput   :  0.01
    Average Read Throughput   :  0.01
    Current Write Throughput  :  0.01
    Average Write Throughput  :  0.01
    Current Simul Throughput  :  0.01
    Average Simul Throughput  :  0.01
*********************************************************

When the USB blaster II disconnected issue happens, both could not work.

'0: Link test - 100 writes and reads" :

Number of write errors:       0
Number of read errors:        0
Number of dword mismatches: 100

"9: Perform DMA" :

Current run #: 1
Current time : Wed Mar 23 13:53:10 2022

DMA throughputs, in GB/s (10^9B/s)
    Current Read Throughput   :  0.00
    Average Read Throughput   :   inf
    Current Write Throughput  :  0.00
    Average Write Throughput  :   inf
    Current Simul Throughput  :  0.00
    Average Simul Throughput  :   inf
*********************************************************
Stopping DMA run due to error..

Meanwhile I notice that when the USB blaster II works, run the command

$ lsusb

and we can find the FPGA card.

lsusb : Bus 001 Device 002: ID 09fb:6810 Altera

when USB blaster II is disconnected, it disappears.