J'ai aussi fait dmesg | grep firewire et ça donne :
[ 4.720332] firewire_ohci 0000:05:00.0: enabling device (0080 -> 0083)
[ 4.775582] firewire_ohci 0000:05:00.0: added OHCI v1.0 device as card 0, 4 IR + 8 IT contexts, quirks 0x41
[ 5.279705] firewire_core 0000:05:00.0: created device fw0: GUID 0011060000003044, S400
[ 1037.973398] firewire_core 0000:05:00.0: rediscovered device fw0
[ 1037.973412] firewire_core 0000:05:00.0: phy config: new root=ffc1, gap_count=5
[ 1037.973710] firewire_ohci 0000:05:00.0: node ID not valid, new bus reset in progress
[ 1038.476543] firewire_core 0000:05:00.0: rediscovered device fw0
[ 1038.476551] firewire_core 0000:05:00.0: phy config: new root=ffc1, gap_count=5
[ 1038.980508] firewire_core 0000:05:00.0: rediscovered device fw0
[ 1038.980520] firewire_core 0000:05:00.0: phy config: new root=ffc1, gap_count=5
[ 1039.484365] firewire_core 0000:05:00.0: rediscovered device fw0
[ 1039.484368] firewire_core 0000:05:00.0: phy config: new root=ffc1, gap_count=5
[ 1039.988330] firewire_core 0000:05:00.0: rediscovered device fw0
[ 1039.988345] firewire_core 0000:05:00.0: phy config: new root=ffc1, gap_count=5
[ 1039.988642] firewire_ohci 0000:05:00.0: node ID not valid, new bus reset in progress
[ 1039.989438] firewire_core 0000:05:00.0: giving up on node ffc0: reading config rom failed: bus reset
[ 1040.036271] firewire_core 0000:05:00.0: giving up on node ffc0: reading config rom failed: timeout
[ 1040.484263] firewire_core 0000:05:00.0: giving up on node ffc0: reading config rom failed: timeout
[ 1040.492341] firewire_core 0000:05:00.0: rediscovered device fw0
[ 1040.492356] firewire_core 0000:05:00.0: phy config: new root=ffc1, gap_count=5
[ 1040.492651] firewire_ohci 0000:05:00.0: node ID not valid, new bus reset in progress
[ 1040.996358] firewire_core 0000:05:00.0: giving up on node ffc0: reading config rom failed: timeout
[ 1040.996438] firewire_core 0000:05:00.0: rediscovered device fw0
[ 1040.996454] firewire_core 0000:05:00.0: phy config: new root=ffc1, gap_count=5
[ 1041.500471] firewire_core 0000:05:00.0: rediscovered device fw0
[ 1041.500491] firewire_core 0000:05:00.0: phy config: new root=ffc1, gap_count=5
[ 1042.004463] firewire_core 0000:05:00.0: rediscovered device fw0
[ 1042.004479] firewire_core 0000:05:00.0: phy config: new root=ffc1, gap_count=5
[ 1042.508726] firewire_core 0000:05:00.0: rediscovered device fw0
[ 1042.508745] firewire_core 0000:05:00.0: phy config: new root=ffc1, gap_count=5
[ 1042.532429] firewire_core 0000:05:00.0: giving up on node ffc0: reading config rom failed: timeout
[ 1042.532439] firewire_core 0000:05:00.0: giving up on node ffc0: reading config rom failed: bus reset
[ 1043.012491] firewire_core 0000:05:00.0: rediscovered device fw0
[ 1043.012510] firewire_core 0000:05:00.0: phy config: new root=ffc1, gap_count=5
[ 1043.044411] firewire_core 0000:05:00.0: giving up on node ffc0: reading config rom failed: timeout
[ 1043.516513] firewire_core 0000:05:00.0: rediscovered device fw0
[ 1043.516529] firewire_core 0000:05:00.0: phy config: new root=ffc1, gap_count=5
[ 1043.556391] firewire_core 0000:05:00.0: giving up on node ffc0: reading config rom failed: timeout
[ 1044.020572] firewire_core 0000:05:00.0: rediscovered device fw0
[ 1044.020588] firewire_core 0000:05:00.0: phy config: new root=ffc1, gap_count=5
[ 1044.068503] firewire_core 0000:05:00.0: giving up on node ffc0: reading config rom failed: timeout
[ 1044.516499] firewire_core 0000:05:00.0: giving up on node ffc0: reading config rom failed: timeout
[ 1044.524575] firewire_core 0000:05:00.0: rediscovered device fw0
[ 1044.524589] firewire_core 0000:05:00.0: phy config: new root=ffc1, gap_count=5
[ 1045.028539] firewire_core 0000:05:00.0: giving up on node ffc0: reading config rom failed: timeout
[ 1045.028613] firewire_core 0000:05:00.0: rediscovered device fw0
[ 1045.028624] firewire_core 0000:05:00.0: phy config: new root=ffc1, gap_count=5
[ 1045.532593] firewire_core 0000:05:00.0: rediscovered device fw0
[ 1045.532595] firewire_core 0000:05:00.0: phy config: new root=ffc1, gap_count=5
[ 1045.533835] firewire_ohci 0000:05:00.0: node ID not valid, new bus reset in progress
[ 1045.540547] firewire_core 0000:05:00.0: giving up on node ffc0: reading config rom failed: timeout
[ 1046.036569] firewire_core 0000:05:00.0: rediscovered device fw0
[ 1046.036584] firewire_core 0000:05:00.0: phy config: new root=ffc1, gap_count=5
[ 1046.036873] firewire_ohci 0000:05:00.0: node ID not valid, new bus reset in progress
[ 1046.052574] firewire_core 0000:05:00.0: giving up on node ffc0: reading config rom failed: timeout
[ 1046.540643] firewire_core 0000:05:00.0: rediscovered device fw0
[ 1046.540664] firewire_core 0000:05:00.0: phy config: new root=ffc1, gap_count=5
[ 1047.044695] firewire_core 0000:05:00.0: rediscovered device fw0
[ 1047.044714] firewire_core 0000:05:00.0: phy config: new root=ffc1, gap_count=5
[ 1047.045451] firewire_core 0000:05:00.0: giving up on node ffc0: reading config rom failed: bus reset
[ 1047.076578] firewire_core 0000:05:00.0: giving up on node ffc0: reading config rom failed: timeout
[ 1047.548680] firewire_core 0000:05:00.0: rediscovered device fw0
[ 1047.548696] firewire_core 0000:05:00.0: phy config: new root=ffc1, gap_count=5
[ 1047.588612] firewire_core 0000:05:00.0: giving up on node ffc0: reading config rom failed: bus reset
[ 1048.052697] firewire_core 0000:05:00.0: rediscovered device fw0
[ 1048.052699] firewire_core 0000:05:00.0: phy config: new root=ffc1, gap_count=5
[ 1048.100649] firewire_core 0000:05:00.0: giving up on node ffc0: reading config rom failed: timeout
[ 1048.548615] firewire_core 0000:05:00.0: giving up on node ffc0: reading config rom failed: timeout
[ 1048.548625] firewire_core 0000:05:00.0: giving up on node ffc0: reading config rom failed: bus reset
[ 1048.556724] firewire_core 0000:05:00.0: rediscovered device fw0
[ 1048.556739] firewire_core 0000:05:00.0: phy config: new root=ffc1, gap_count=5
[ 1049.060780] firewire_core 0000:05:00.0: rediscovered device fw0
[ 1049.060795] firewire_core 0000:05:00.0: phy config: new root=ffc1, gap_count=5
[ 1049.564762] firewire_core 0000:05:00.0: rediscovered device fw0
[ 1049.564774] firewire_core 0000:05:00.0: phy config: new root=ffc1, gap_count=5
[ 1049.573736] firewire_core 0000:05:00.0: giving up on node ffc0: reading config rom failed: timeout
[ 1050.068812] firewire_core 0000:05:00.0: rediscovered device fw0
[ 1050.068831] firewire_core 0000:05:00.0: phy config: new root=ffc1, gap_count=5
[ 1050.572842] firewire_core 0000:05:00.0: rediscovered device fw0
[ 1050.572858] firewire_core 0000:05:00.0: phy config: new root=ffc1, gap_count=5
[ 1050.596739] firewire_core 0000:05:00.0: giving up on node ffc0: reading config rom failed: timeout
[ 1051.076866] firewire_core 0000:05:00.0: rediscovered device fw0
[ 1051.076881] firewire_core 0000:05:00.0: phy config: new root=ffc1, gap_count=5
[ 1051.108814] firewire_core 0000:05:00.0: giving up on node ffc0: reading config rom failed: timeout
[ 1051.108823] firewire_core 0000:05:00.0: giving up on node ffc0: reading config rom failed: bus reset
[ 1051.580865] firewire_core 0000:05:00.0: rediscovered device fw0
[ 1051.580881] firewire_core 0000:05:00.0: phy config: new root=ffc1, gap_count=5
[ 1051.621739] firewire_core 0000:05:00.0: giving up on node ffc0: reading config rom failed: timeout
[ 1052.084760] firewire_core 0000:05:00.0: rediscovered device fw0
[ 1052.084763] firewire_core 0000:05:00.0: phy config: new root=ffc1, gap_count=5
[ 1052.085028] firewire_ohci 0000:05:00.0: no self IDs
[ 1052.086987] firewire_core 0000:05:00.0: giving up on node ffc0: reading config rom failed: bus reset
[ 1052.133747] firewire_core 0000:05:00.0: giving up on node ffc0: reading config rom failed: timeout
[ 1052.580801] firewire_core 0000:05:00.0: giving up on node ffc0: reading config rom failed: timeout
[ 1052.588817] firewire_core 0000:05:00.0: rediscovered device fw0
[ 1052.588819] firewire_core 0000:05:00.0: phy config: new root=ffc1, gap_count=5
[ 1053.092816] firewire_core 0000:05:00.0: giving up on node ffc0: reading config rom failed: timeout
[ 1053.092833] firewire_core 0000:05:00.0: rediscovered device fw0
[ 1053.092835] firewire_core 0000:05:00.0: phy config: new root=ffc1, gap_count=5
[ 1053.604958] firewire_core 0000:05:00.0: giving up on node ffc0: reading config rom failed: timeout
[ 1055.652895] firewire_core 0000:05:00.0: giving up on node ffc0: reading config rom failed: bus reset