interrupt delivery does not seem to work

[Miernik]

I can't get my Senao miniPCI SL-2511MP PLUS 2.10 card to work.

The card has a sticker:
S/N: 044377522
NL-2511MP PLUS(ETSI)
MAC: 00026F33B9F3

Here I show what commands I run, and what appears after that in "dmesg"
output:

# insmod hostap
,----------------------------------------------------------------------------------------------------------------------------------
| hostap_crypt: registered algorithm 'NULL'
`----------------------------------------------------------------------------------------------------------------------------------
# insmod hostap_pci
,----------------------------------------------------------------------------------------------------------------------------------
| hostap_pci: 0.3.9 - 2005-06-10 (Jouni Malinen <jkmaline at cc.hut.fi>)
| PCI: Enabling device 01:02.0 (0000 -> 0002)
| hostap_pci: Registered netdevice wifi0
| wifi0: Original COR value: 0x0
| prism2_hw_init: initialized in 200 ms
| wifi0: NIC: id=0x8013 v1.0.0
| wifi0: PRI: id=0x15 v1.1.1
| wifi0: STA: id=0x1f v1.8.4
| wifi0: Intersil Prism2.5 PCI: mem=0x40002000, irq=6
| wifi0: registered netdevice wlan0
`----------------------------------------------------------------------------------------------------------------------------------
# iwconfig wlan0 mode Managed
,----------------------------------------------------------------------------------------------------------------------------------
| prism2: wlan0: operating mode changed 3 -> 2
`----------------------------------------------------------------------------------------------------------------------------------
# ifconfig wlan0 up
# iwlist wlan0 scan
,----------------------------------------------------------------------------------------------------------------------------------
| wlan0: hfa384x_cmd: entry still in list? (entry=80e89c60, type=0, res=0)
| wlan0: hfa384x_cmd: command was not completed (res=0, entry=80e89c60, type=0, cmd=0x0021, param0=0xfdc6, EVSTAT=8010 INTEN=0000)
| wlan0: interrupt delivery does not seem to work
| wlan0: hfa384x_get_rid: CMDCODE_ACCESS failed (res=-145, rid=fdc6, len=12)
| wlan0: hfa384x_cmd: entry still in list? (entry=80e89c60, type=0, res=0)
| wlan0: hfa384x_cmd: command was not completed (res=0, entry=80e89c60, type=0, cmd=0x0021, param0=0xfdc1, EVSTAT=8010 INTEN=0000)
| wlan0: interrupt delivery does not seem to work
| wlan0: hfa384x_get_rid: CMDCODE_ACCESS failed (res=-145, rid=fdc1, len=2)
| wlan0: hfa384x_cmd: entry still in list? (entry=80e89c60, type=0, res=0)
| wlan0: hfa384x_cmd: command was not completed (res=0, entry=80e89c60, type=0, cmd=0x0021, param0=0xfdc6, EVSTAT=8010 INTEN=0000)
| wlan0: interrupt delivery does not seem to work
| wlan0: hfa384x_get_rid: CMDCODE_ACCESS failed (res=-145, rid=fdc6, len=12)
| wlan0: hfa384x_cmd: entry still in list? (entry=80e89c60, type=0, res=0)
| wlan0: hfa384x_cmd: command was not completed (res=0, entry=80e89c60, type=0, cmd=0x0021, param0=0xfc06, EVSTAT=8010 INTEN=0000)
| wlan0: interrupt delivery does not seem to work
| wlan0: hfa384x_get_rid: CMDCODE_ACCESS failed (res=-145, rid=fc06, len=2)
| wlan0: hfa384x_cmd: entry still in list? (entry=80e89c60, type=0, res=0)
| wlan0: hfa384x_cmd: command was not completed (res=0, entry=80e89c60, type=0, cmd=0x0021, param0=0xfd42, EVSTAT=8010 INTEN=0000)
| wlan0: interrupt delivery does not seem to work
| wlan0: hfa384x_get_rid: CMDCODE_ACCESS failed (res=-145, rid=fd42, len=6)
| wlan0: hfa384x_cmd: entry still in list? (entry=80e89ce0, type=0, res=0)
| wlan0: hfa384x_cmd: command was not completed (res=0, entry=80e89ce0, type=0, cmd=0x0021, param0=0xfc0e, EVSTAT=8010 INTEN=0000)
| wlan0: interrupt delivery does not seem to work
| wlan0: hfa384x_get_rid: CMDCODE_ACCESS failed (res=-145, rid=fc0e, len=34)
`----------------------------------------------------------------------------------------------------------------------------------

The output of the last command usually is:
,---------------------------
| wlan0     No scan results
`---------------------------
but sometimes (so far 3 times, for probably a hundred attepts to get a
scan), I get a correct scan with 6 or mode APs in range, many of them
with very good signal, like -68 dBm at noise level -90 dBm. The card is
in fact in good radio rage, so that should be the correct output all the
time.

I also tried downgrading the card's STA firmware to v1.7.4, with the
same results.

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