Bonjour,
Sur mon ordinateur en fedora 29, j'ai ajouté une carte firewire1394a Card en PCI express.
J'ai fait la commande lspci qui reconnaît bien la carte. (voir code ci-dessous)

Quand j'ouvre VLC et vais dans l'onglet "périphérique de capture, rien de particulier n'apparaît pur montrer le flux de la caméra branchée ?

Une idée ?
00:00.0 Host bridge: Intel Corporation 8th Gen Core Processor Host Bridge/DRAM Registers (rev 07)
00:01.0 PCI bridge: Intel Corporation Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor PCIe Controller (x16) (rev 07)
00:14.0 USB controller: Intel Corporation Cannon Lake PCH USB 3.1 xHCI Host Controller (rev 10)
00:14.2 RAM memory: Intel Corporation Cannon Lake PCH Shared SRAM (rev 10)
00:16.0 Communication controller: Intel Corporation Cannon Lake PCH HECI Controller (rev 10)
00:17.0 SATA controller: Intel Corporation Cannon Lake PCH SATA AHCI Controller (rev 10)
00:1b.0 PCI bridge: Intel Corporation Cannon Lake PCH PCI Express Root Port #21 (rev f0)
00:1c.0 PCI bridge: Intel Corporation Cannon Lake PCH PCI Express Root Port #5 (rev f0)
00:1c.6 PCI bridge: Intel Corporation Cannon Lake PCH PCI Express Root Port #7 (rev f0)
00:1d.0 PCI bridge: Intel Corporation Cannon Lake PCH PCI Express Root Port #9 (rev f0)
00:1d.2 PCI bridge: Intel Corporation Cannon Lake PCH PCI Express Root Port #11 (rev f0)
00:1d.3 PCI bridge: Intel Corporation Cannon Lake PCH PCI Express Root Port #12 (rev f0)
00:1f.0 ISA bridge: Intel Corporation Device a308 (rev 10)
00:1f.3 Audio device: Intel Corporation Cannon Lake PCH cAVS (rev 10)
00:1f.4 SMBus: Intel Corporation Cannon Lake PCH SMBus Controller (rev 10)
00:1f.5 Serial bus controller [0c80]: Intel Corporation Cannon Lake PCH SPI Controller (rev 10)
01:00.0 VGA compatible controller: NVIDIA Corporation GF114 [GeForce GTX 560] (rev a1)
01:00.1 Audio device: NVIDIA Corporation GF114 HDMI Audio Controller (rev a1)
04:00.0 PCI bridge: ASMedia Technology Inc. ASM1083/1085 PCIe to PCI Bridge (rev 01)
05:00.0 FireWire (IEEE 1394): VIA Technologies, Inc. VT6306/7/8 [Fire II(M)] IEEE 1394 OHCI Controller (rev 46)
07:00.0 PCI bridge: ASMedia Technology Inc. ASM1083/1085 PCIe to PCI Bridge (rev 04)
08:00.0 Network controller: Qualcomm Atheros AR9227 Wireless Network Adapter (rev 01)
09:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 15)
[tastybud@localhost ~]$ 
[tastybud@localhost ~]$ ^C
[tastybud@localhost ~]$ ^C
[tastybud@localhost ~]$
A tout hasard il lui faut peut-être un pilote ?
Que retourne 
$ lspci -nnk | grep -iA3 "FireWire"
Voilà la réponse Nicoss : 
lspci -nnk | grep -iA3 "FireWire"
05:00.0 FireWire (IEEE 1394) [0c00]: VIA Technologies, Inc. VT6306/7/8 [Fire II(M)] IEEE 1394 OHCI Controller [1106:3044] (rev 46)
        Subsystem: VIA Technologies, Inc. VT6306/7/8 [Fire II(M)] IEEE 1394 OHCI Controller [1106:3044]
        Kernel driver in use: firewire_ohci
        Kernel modules: firewire_ohci
07:00.0 PCI bridge [0604]: ASMedia Technology Inc. ASM1083/1085 PCIe to PCI Bridge [1b21:1080] (rev 04)
08:00.0 Network controller [0280]: Qualcomm Atheros AR9227 Wireless Network Adapter [168c:002d] (rev 01)
        Subsystem: Qualcomm Atheros Device [168c:0301]
J'ai aussi fait un "lsmod | grep firewire qui donne pour connaître les modules kernel installés : 
firewire_ohci          45056  0
firewire_core          81920  1 firewire_ohci
crc_itu_t              16384  1 firewire_core
Normalement je lance la lecture sur ma caméra mini-dv et récupère via VLC (capture vidéo) mais là, il ne trouve rien...
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
Ta carte fonctionne bien à la base ?
Tu as regardé dans Paramètres (sous Gnome) s'il voyait quelque chose ?
Tu as testé un autre logiciel que VLC (genre guvcview, Cheese ou Kamoso) ?
Nan, rien du tout dans paramètres sous Gnome. du coup j'ai testé sous guvcview, cheese kamoso, rien......

Pour ce qui est de la carte, elle est toute neuve.
As-tu un autre câble pour essayer ou est-ce celui livré avec la carte ?
Oui Nicosss, j'ai bien essayé, selon ta suggestion, un autre cable. Même punition. Je vais retourner la carte au vendeur...je crois que c'est mieux.