[rt2x00-users] No probe response - rt2800usb

[Aleksandar Milivojevic]

On Tue, Apr 12, 2011 at 11:33 PM, linux newbie <linux.newbie79 at gmail.com> wrote:
> Hi,
>
> I am using USB wireless card on my embedded linux (kernel version
> 2.6.350 system . It uses rt2800 driver.
>
> From my device I can able to associate with AP using wpa_supplicant.
> If I ping to some other terminal it is working fine for long time.
>
> My device connect to other server using telnet, and after some time my
> device dis-associates from AP and kernel message shows "No probe
> response from AP, after 500ms, disconnect". My wpa_supplicant is
> running in the backgroud but still it couldnt able to associate again.
> If I kill the supplicant and run it again, things are working fine and
> this time it is not disconnecting for long time..
>
> I havent faced this issue with other wireless card based on rt73usb driver.
>
> Is this known issue and is there any patch available?

Which device/chipset?

You can try disabling power saving mode using something like "iwconfig
wlan0 power off" (change wlan0 to whatever is correct interface name
in your case).  If it helps, it may be a known issue of USB device
going into power saving mode and missing beacons (see for example
recent thread "Add autowake support for USB hardware" from Ivo van
Doorn).  I'm hitting that issue with an rt2780 based USB card.