Poking around showed that the PVR150 seems to be sharing the IRQ with the graphic card, could that cause this sort of issue?
01:00.0 VGA compatible controller: nVidia Corporation NV28 [GeForce4 Ti 4200 AGP 8x] (rev a1) (prog-if 00 [VGA])
Subsystem: CardExpert Technology: Unknown device 0404
Flags: bus master, 66Mhz, medium devsel, latency 248, IRQ 5
Memory at e0000000 (32-bit, non-prefetchable)
Memory at d0000000 (32-bit, prefetchable)
Capabilities: [60] Power Management version 2
Capabilities: [44] AGP version 3.0
02:08.0 Multimedia video controller: Internext Compression Inc iTVC16 (CX23416) MPEG-2 Encoder (rev 01)
Subsystem: Hauppauge computer works Inc.: Unknown device 8801
Flags: bus master, medium devsel, latency 64, IRQ 5
Memory at d8000000 (32-bit, prefetchable)
Capabilities: [44] Power Management version 2
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