What does your debug.log tell you;
example;
snip
.....................................................................
Skipping existing stock config
Skipping existing stock config
Skipping existing stock config
Skipping existing stock config
Skipping existing stock config
Skipping existing stock config
Skipping existing stock config
Skipping existing stock config
Auto-detected Icom ID-51A on /dev/ttyUSB0
User selected Icom ID-51A on port /dev/ttyUSB0
Clone thread started
Starting HiSpeed:
000: fe fe fe fe fe fe fe fe ........
008: fe fe fe fe fe fe fe fe ........
016: fe fe fe fe ee ef e8 33 .......3
024: 90 00 01 00 00 02 01 fd ........
................................................................
in ~/.chirp/debug.log ?