(originally reported in https://bugs.launchpad.net/ubuntu/+source/linux/+bug/956732) On a Thinkpad x201, on today's Precise, with upstream kernel 3.3.0-030300rc7-generic wifi works reliably in general, but under load (~2Mbps) it will fail: receiving no traffic, but not giving any obvious errors To produce enough load, I started downloading several Ubuntu ISOs from remote servers. This works for a variable period of time, sometimes a few minutes, topping out at 2MB/s, which is about my ADSL peak speed. At moderate load it can work all day, including across suspend/resume cycles, so at least the symptoms are different to bug 948235 and bug 956401, though perhaps the cause is the same. Running 'sudo rmmod iwlwifi && sudo modprobe iwlwifi' consistently gets it working again. I'm happy to help debug or test this is someone gives me a suggestion.
... that should have said 2MByte/s, not Mbit
That issue happens to me consistently when using MythTV to stream video content at 16-18mbits. It takes approximately 1 minute for the signal to drop. As Martin Pool mentioned, unloading/reloading the iwlwifi module does the job, using the hardware switch does too. Any way I can help debugging or testing?
I forgot mentionning it also happens to me on kernels 3.2 and 3.4 series.
I regularly (~ 1-3 times per hour) experience the same issue. I'm using ubuntu 12.04 AMD64 with the Ubuntu kernel 3.2.0-25-generic. Sometimes the drop-out is accompanied with a dmesg message "Microcode SW error detected. Restarting 0x2000000." (see attachments for details), but not always. Switching wireless off and on again allows for successful reconnection.
Created attachment 73525 [details] dmesg
Created attachment 73526 [details] lspci -vvv
still an issue?