#2336: Madwifi driver + AR2413 chipset transmitting higher power at lower
band(<2.4012 Ghz) when there are no AP
-------------------------------------+--------------------------------------
Reporter: soumyametu...@gmail.com | Type: defect
Status: new | Priority: blocker
Component: madwifi: driver | Version: trunk
Keywords: | Patch_attached: 0
Pending: 0 |
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I am having the issue Madwifi driver + AR2413 chipset transmitting higher
power at lower band(<2.4012 Ghz) when there are no AP. Verified this by
connecting spectrum analyzer and seeing the transmitted power.
I am using the chipset AR2413 and madwifi driver svn revision 4022. More
details of
lspci
03:0f.0 Ethernet controller: Atheros Communications, Inc. AR5005G
802.11abg NIC (rev 01)
Subsystem: Atheros Communications, Inc. Compex Wireless 802.11 b/g
MiniPCI Adapter, Rev A1 [WLM54G]
Flags: bus master, medium devsel, latency 96, IRQ 20
Memory at dfce0000 (32-bit, non-prefetchable) [size=64K]
Capabilities: [44] Power Management version 4
-----------------------
dmesg when the module is loaded
MadWifi: ath_attach: Switching rfkill capability off.
wifi0: Atheros AR2413 chip found (MAC 7.8, PHY 2112A 4.5, Radio 5.6)
ath_pci: wifi0: Atheros 2413: mem=0xdfce0000, irq=20
-------------------------
I am using wpa_supplicant, the wpa_supplicant.conf settings are
ctrl_interface=/var/run
ctrl_interface_group=<groupname>
update_config=1
----------------------------
Since this is operated in germany, I am setting the regdomain to 0x37 in
EEPROM of chip using ath_info utility
ath_info -f -w dfce0000 regdomain=0x37
Then loading the driver using countrycode settings
modprobe ath_pci countrycode=276
strating the wpa_supplicant
----------------------------------
Note there are on access point available and when we measure the transmit
power it shows 10dbm higher in lower band(<channel1(2.4012Ghz), this is
violating the german ETSI regulations . As soon as access point/ssid
becomes available the power level goes down and is within germany
regulation.
When does the maxtxpower gets set ? I am not sure if the driver is
initializing all the values when I load the madwifi driver with germany
country-code or it does later when it find a AP during scan. Any solution
to this would help greatly, this blocking from product being passed for
certification.
Graph1 shows the violation that is shaded part. Graph 2 shows both when AP
was not available and when AP was available.
--
Ticket URL: <http://madwifi-project.org/ticket/2336>
madwifi-project.org <http://madwifi-project.org/>
Multiband Atheros Driver for Wireless Fidelity
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