wi0 and adhoc

Hi!

I have two freebsd boxes with 4.11 (yes, really!). They both
serve wifi adhoc link (wi0 + pcic0: <Vadem 469>) during many
years with no problems. One box has died, and I change it to
new one with 8.0-rel. New box have cbb0 and same wi0 card. So, 
now I have two boxes 4.11 and 8.0. Both with wi0 devices detected.

Configs:

4.11 freebsd:
wi0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        inet 192.168.197.1 netmask 0xfffffffc broadcast 192.168.197.3
        ether 00:02:2d:05:77:1e
        media: IEEE 802.11 Wireless Ethernet autoselect (DS/11Mbps <adhoc>)
        status: associated
        ssid IBSS 1:NT
        stationname sta1
        channel 12 authmode OPEN powersavemode OFF powersavesleep 100
        wepmode OFF weptxkey 1

8.0 freebsd:
wi0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 2290
        ether 00:60:1d:f6:bf:a4
        media: IEEE 802.11 Wireless Ethernet autoselect mode 11b <adhoc>
        status: running
wlan0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
        ether 00:60:1d:f6:bf:a4
        inet 192.168.197.2 netmask 0xfffffffc broadcast 192.168.197.3
        media: IEEE 802.11 Wireless Ethernet autoselect mode 11b <adhoc>
        status: running
        ssid IBSS channel 12 (2467 Mhz 11b) bssid 5e:b2:ec:5c:c1:8c
        country US authmode OPEN privacy OFF txpower 0 scanvalid 60

# ifconfig wlan0 list caps
drivercaps=10301<STA,IBSS,PMGT,MONITOR>
cryptocaps=1<WEP>

pciconf -lvc:
....
cbb0@pci0:2:9:0:        class=0x060700 card=0x14101524 chip=0x14101524 rev=0x01 hdr=0x02
    vendor     = 'ENE Technology Inc'
    device     = 'CardBus Controller (CB-1420)'
    class      = bridge
    subclass   = PCI-CardBus
    cap 01[a0] = powerspec 1  supports D0 D1 D2 D3  current D0
....

dmesg:
wi0: <Lucent Technologies WaveLAN/IEEE> at port 0x100-0x13f irq 17 function 0 config 1 on pccard0
wi0: [ITHREAD]
wi0: device timeout
wi0: device timeout
wi0: record read mismatch, rid=fd44, got=fc80
wi0: device timeout
.....

my questions are:
1. why txpower 0 in 8.0 box?
2. why too many ``device timeout'' messages in dmesg on 8.0 box?
3. why all pings lost in that link?

thanks.

-- 
 Lystopad Olexandr 
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