2015-02-23 00:28:50 +00:00
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created: 2008-10-21 00:14:48 +0200
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2022-01-23 17:14:59 +00:00
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layout: redirect
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layout_old: default
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redirect_to: https://blog.mbirth.de/archives/2008/10/21/wifi-on-the-acer-aspire-one.html
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2015-02-23 00:28:50 +00:00
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tags:
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2022-01-23 17:14:59 +00:00
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- know-how
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- hardware
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- acer
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- aspire
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- wifi
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title: WiFi on the Acer Aspire One
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toc: false
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updated: 2009-09-14 18:48:23 +0200
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2015-02-23 00:28:50 +00:00
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---
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2022-01-23 17:14:59 +00:00
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2015-02-23 00:28:50 +00:00
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**Chipset:** Atheros AR2425
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Change Regdomain
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================
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The WiFi card comes set to regdom `0x65` (World/ETSI C) which limits the channels to 1..11. (`iw list` shows
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channels 12..14 as *disabled*.) In Germany, there are also channels 12 and 13 which are unusable this way. But
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there's the tool `ath_info` which can read and write the EEPROM on the card and thus also the regdomain.
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First, find the base address of the adapter using
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lspci -vv
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Mine was at address `75200000`. Now you can dump the contents of the EEPROM using
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ath_info 0x75200000
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To write the EEPROM, you have to unlock it by setting a GPIO register, namely the first, to zero. I changed the
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regdomain to <del>0x00 (=ALL channels available)</del> 0x68 (=EU1 World) using this command:
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ath_info -g 1:0 -w 0x75200000 regdomain 68
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You can find all valid codes by looking at the `DMN_` constants in the
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[regdom.h](http://www.cs.fsu.edu/~baker/devices/lxr/http/source/linux/drivers/net/wireless/ath5k/regdom.h) file.
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After unloading the modules: `ath5k`, `ath`, `mac80211` and `cfg80211` and doing a `modprobe ath5k`, the command
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`iw list` should show the two new channels enabled.
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**For older ieee80211 modules**, there's a module option `ieee80211_regdom` for the `cfg80211` module. This takes
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the values `US`, `JP` or `EU`. Add the following lines to `/etc/modprobe.d/options`:
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options cfg80211 ieee80211_regdom=EU
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options lbm_cw_cfg80211 ieee80211_regdom=EU
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And after a reboot, you will have channels 12 and 13 available.
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On Jaunty, you have to install the package `iw` and use the following command in e.g. your `/etc/rc.local` to set
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the regdomain to *Germany*:
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iw reg set DE
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Possible errors
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---------------
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If you get the message `MAC revision 0xffff is not supported!` it means that some other module, likely `ath_hal`
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2022-01-23 17:14:59 +00:00
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and/or `ath_pci` took over your card.
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