[arch-general] Firewire : resume from suspend may fail

[SET]

Hello,

Resume from suspend to RAM in KDE fails if no video cam has been used. The 
camcorder is connected to a firewire card in a PCIE-1 expansion slot. If the 
camcorder has been used and is connected, the machine resumes rightly to the 
desktop.

When it does not resume, I get a black screen with a blinking cursor, no 
mouse, no keyboard. Network was available once only to login through SSH. This 
leaves no choice but a hard reboot. Fortunately, the disk partitions are 
always clean. After the hard reboot, there's no single error message in /var/
log/{errors,kernel}.log, not even a single resume message from kernel.

I've tried, on their own, pcie_hp=nomsi, firewire_ohci.quirks={0x10,0x40} to no 
avail.

Using :
kernel 5.3.x and 5.4.x.
FireWire (IEEE 1394): VIA Technologies, Inc. VT6306/7/8 [Fire II(M)] IEEE 1394 
OHCI Controller (rev 46)

I'm about to remove the card once I've downloaded the recordings. I wish of 
course no being obliged to do that.

Does anyone have some advice to fix that ?

Thanks.