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I have a MacBook Air mid 2012 with i7 CPU. The one with Ivy Bridge.

I have connectivity problems with wifi running Arch Linux which I keep updated regularily. Throughput and response time performance decrease a lot when I move away from the AP (tried several networks with similar results).

Strangely I don't experience the same issues with OS X. I have tried switching between Mountain Lion and Arch Linux while staying in the exact same position. OS X performs perfectly while Linux can't even ping the router.

Are there any settings that I am missing? Should I use some particular driver? I have tried to read up on and fiddle with iwconfig.

Any suggestions are welcome, I'm quite new at this level of Linux configuration.

lspci gives me

02:00.0 Network controller: Broadcom Corporation BCM43224 802.11a/b/g/n (rev 01)

Trying to change power with iwconfig gives me:

-> % sudo iwconfig wlan0 power off
Error for wireless request "Set Power Management" (8B2C) :
SET failed on device wlan0 ; Operation not supported.

Addition: I installed the broadcom-wl driver. The connection seams to be a little bit more stable. But there is still a long way to go compared to OS X.

lspci now reports

02:00.0 Network controller: Broadcom Corporation BCM43224 802.11a/b/g/n (rev 01)
Subsystem: Apple Inc. Device 00e9
Kernel driver in use: wl
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Just to clarify your device is wlan0? which driver are you currently using? have you attempted the others listed on the wiki? –  Livinglifeback Apr 27 '13 at 4:27
    
I have not tested other drivers. lspci gives me "Kernel driver in use: bcma-pci-bridge" for the device. I would like to test other drivers, but I'm not sure how to do that. –  Fredrik Andersson Apr 29 '13 at 10:12
    
Yes my device is wlan0 –  Fredrik Andersson Apr 29 '13 at 11:33
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1 Answer

up vote 1 down vote accepted

I have a similar mac that I run Arch on assuming you have a broadcom card there are three possible drivers that may (or may not) work. (broadcom-wl) works for me. Also check pm-utils for powersaving settings. Further details on both can be found on the Arch wiki here

For further help post the wireless card info found with lspci.

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I set this answer as the correct because it led me to install broadcom-wl driver from AUR. The installation was simple enough and once rebooting the machine the broadcom-wl driver replaces the old one. –  Fredrik Andersson May 2 '13 at 8:34
    
Further things to look into would be the other drivers and different wireless managers. I use wicd-curses but different people report that different managers have different effects on the signal strength and connectivity. –  Livinglifeback May 4 '13 at 0:50
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