#939: T40p/168c:0012 (rev 01): madwifi-ng: Sets txpower to Off by
default/elsewhere...
--------------------------------------+-------------------------------------
Reporter: anonymous | Owner:
Type: defect | Status: new
Priority: major | Milestone:
Component: madwifi: other | Version: trunk
Keywords: t40p txpower countrycode | Patch_attached: 0
--------------------------------------+-------------------------------------
Hi,
Using svn trunk revision 1747 under linux-2.6.19-rc1, madwifi-ng defaults
txpower to `off'. When the driver accepts an attempt to reset the txpower
via iwconfig (for example, when...
{{{
iwconfig ath0 txpower 17
}}}
...runs without error), the change to the transmit power is short lived:
within a minute or so, the txpower reported by iwconfig once again shows
up as `off'. This has a considerable affect on wireless range, which is
reduced to around 12 feet, and even then, w/direct line of sight to the
router: a DLINK di784. There is an immediate, noticeable difference when
I subsequently reset the txpower as above: real 802.11a bandwidth goes
from around 40Kbyte/s to the more normal 2Mbyte/s range. The Windows
driver (via Windows or ndiswrapper) shows the latter performance level at
all ranges I have tested.
I have read some information on country codes elsewhere on this site, and
wonder if hal is having trouble detecting the correct value for this card:
{{{
# grep -r . /proc/sys/dev/{wifi0,ath}/* | egrep 'country|reg'
/proc/sys/dev/wifi0/countrycode:0
/proc/sys/dev/wifi0/regdomain:97
/proc/sys/dev/ath/countrycode:0
}}}
If I interpret the report on countrycodes at www.nuclearcat.com/athmap.txt
correctly, this looks like some sort of catch-all country code, which only
allows the lowest common denominator as far as txpower threshold.
I have tried resetting the countrycode via the countrycode parameter to
the ath_pci kernel module, but all values I have attempted (UNITED STATES
- 840, CANADA - 124, FCC1_FCCA - 16, along with various other values
randomly chosen from the linked-to-text-file) are met with the encouraging
diagnostic-free modprobe run, but the following syslog diagnostic:
{{{
Oct 8 10:04:36 hostname ath_pci: 0.9.4.5 (svn r1747)
Oct 8 10:04:36 hostname PCI: Enabling device 0000:02:02.0 (0340 -> 0342)
Oct 8 10:04:36 hostname ACPI: PCI Interrupt 0000:02:02.0[A] -> Link
[LNKC] -> GSI 11 (level, low) -> IRQ 11
Oct 8 10:04:36 hostname wifi%d: unable to collect channel list from hal;
regdomain likely 97 country code 840
Oct 8 10:04:36 hostname ACPI: PCI interrupt for device 0000:02:02.0
disabled
}}}
...with the corresponding country code in place of 840.
As this is mentioned on your compatibility page (
madwifi.org/wiki/Compatibility#T40pT40R40G40IBM802.11abminiPCI ) I am
unsure if this is a known issue that you are currently working on, or
whether this should be actively tracked. As I am relatively new to
madwifi, I may even be wrong in pursuing this countrycode avenue...may be
a red herring.
Regards,
----
System Information:
modprobe ath_pci produces the following syslog output:
{{{
ath_hal: 0.9.18.0 (AR5210, AR5211, AR5212, RF5111, RF5112, RF2413, RF5413)
wlan: 0.8.4.2 (svn r1747)
ath_rate_sample: 1.2 (svn r1747)
ath_pci: 0.9.4.5 (svn r1747)
PCI: Enabling device 0000:02:02.0 (0340 -> 0342)
ACPI: PCI Interrupt 0000:02:02.0[A] -> Link [LNKC] -> GSI 11 (level, low)
-> IRQ 11
wifi0: 11a rates: 6Mbps 9Mbps 12Mbps 18Mbps 24Mbps 36Mbps 48Mbps 54Mbps
wifi0: 11b rates: 1Mbps 2Mbps 5.5Mbps 11Mbps
wifi0: H/W encryption support: WEP AES
wifi0: mac 4.2 phy 3.0 5ghz radio 1.7 2ghz radio 2.3
wifi0: Use hw queue 0 for WME_AC_BE traffic
wifi0: Use hw queue 0 for WME_AC_BK traffic
wifi0: Use hw queue 0 for WME_AC_VI traffic
wifi0: Use hw queue 0 for WME_AC_VO traffic
wifi0: Use hw queue 8 for CAB traffic
wifi0: Use hw queue 9 for beacons
wifi0: Atheros 5211: mem=0xc0210000, irq=11
}}}
uname -a
{{{
Linux ctmobile 2.6.19-rc1 #2 PREEMPT Sat Oct 7 23:05:43 EDT 2006 i686
Intel(R) Pentium(R) M processor 1600MHz GenuineIntel GNU/Linux
}}}
madwifi-ng configuration
{{{
# grep -r . /proc/sys/dev/{wifi0,ath}/*
/proc/sys/dev/wifi0/ackrate:0
/proc/sys/dev/wifi0/acktimeout:25
/proc/sys/dev/wifi0/countrycode:0
/proc/sys/dev/wifi0/ctstimeout:25
/proc/sys/dev/wifi0/debug:0
/proc/sys/dev/wifi0/diversity:0
/proc/sys/dev/wifi0/fftxqmin:3
/proc/sys/dev/wifi0/ledpin:0
/proc/sys/dev/wifi0/regdomain:97
/proc/sys/dev/wifi0/rxantenna:1
/proc/sys/dev/wifi0/slottime:9
/proc/sys/dev/wifi0/softled:1
/proc/sys/dev/wifi0/tkipmic:0
/proc/sys/dev/wifi0/txantenna:0
/proc/sys/dev/wifi0/txintrperiod:5
/proc/sys/dev/wifi0/xrpollcount:32
/proc/sys/dev/wifi0/xrpollperiod:100
/proc/sys/dev/ath/calibrate:30
/proc/sys/dev/ath/countrycode:0
/proc/sys/dev/ath/debug:0
/proc/sys/dev/ath/hal/swba_backoff:0
/proc/sys/dev/ath/hal/sw_beacon_response_time:10
/proc/sys/dev/ath/hal/dma_beacon_response_time:2
/proc/sys/dev/ath/outdoor:0
/proc/sys/dev/ath/xchanmode:1
}}}
iwconfig output (wep key and essid removed)
{{{
# iwconfig
lo no wireless extensions.
eth0 no wireless extensions.
wifi0 no wireless extensions.
ath0 IEEE 802.11a ESSID:"my-essid"
Mode:Managed Frequency:5.3 GHz Access Point: 00:13:46:A1:9B:9E
Bit Rate:18 Mb/s Tx-Power=off Sensitivity=0/3
Retry:off RTS thr:off Fragment thr:off
Encryption key:My 128bit WEP Key [index] Security mode:open
Power Management:off
Link Quality=50/94 Signal level=-41 dBm Noise level=-91 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0
}}}
lspci Information:
{{{
# lspci
...
...
02:02.0 Ethernet controller: Atheros Communications, Inc. AR5211 802.11ab
NIC (rev 01)
...
...
# lspci -n
...
...
02:02.0 0200: 168c:0012 (rev 01)
...
...
}}}
txpower Settings
{{{
# iwlist ath0 txpower
ath0 8 available transmit-powers :
0 dBm (1 mW)
5 dBm (3 mW)
7 dBm (5 mW)
9 dBm (7 mW)
11 dBm (12 mW)
13 dBm (19 mW)
15 dBm (31 mW)
17 dBm (50 mW)
Current Tx-Power:off
}}}
Much more information on the hardware is available via the thinkWiki site
mentioned on your compatibility page (see link above).
--
Ticket URL: <http://madwifi.org/ticket/939>
MadWifi <http://madwifi.org/>
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