Comment 0 for bug 600942
Revision history for this message
| Ivan Potapenko (i-o-potapenko) wrote Atheros AR5008 on Ubuntu 10.04 with either ath9k or ndiswrapper drivers cause excessive CPU wakeup | #0 |
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I have recently tried to upgrade my netbook with an Atheros AR5008 Wifi card from Ubuntu 8.04 to 10.04. This was done by a clean install (not the Ubuntu dist-upgrade procedure).
Everything worked fine except for the wireless card. When using 8.04 I used ndiswrapper with great success. Now, both the ndiswrapper and ath9k drivers give me a very strange problem: They wake up CPU excessively making the whole system slow and unresponsive. This usually happens after I have connected to a network and try to transfer any substantial amount of data.
If you take a look at powertop output you can see that wakeup number usually is below approximately 1500 (even with heavy usage of wifi with Ubuntu 8.04). However on Lucid I get often numbers ranging from 5000 to 15000 which is ridiculously high.
Once the excessive wakeups have begun, no iwconfig power saving configuration or even rmmod-ing the driver helps. Installing wireless from backports does not alleviate the problem either.
This is also present on most other major distributions (OpenSUSE, Fedora Core) as well as Ubuntu derivatives (Mint etc). The only exception is Arch which uses a newer kernel version (which may or may not have something to do with the problem).