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On 05/23/2012 10:02 AM, JD wrote:
> On 05/22/2012 02:56 PM, John Horne wrote:
>> On Mon, 2012-05-21 at 17:19 -0700, JD wrote:
>>> When I take my laptop to starbucks or McDonalds hot spot, even when
>>> sitting outside, bitrate never is below 54mbps, sometime is as high as
>>> 72mb/s
>>>
>> Hi,
>>
>> Reading through your messages, you have now said two things:
>>
>> 1) You used an RTL card and got the same problem; 2) Using the laptop
>> elsewhere (starbucks) and it works fine.
>>
>> To me both of those tend to indicate that the WLAN card is okay, but
>> perhaps your router (or at least something else) is causing a problem.
>> The RTL card would have used a different driver than the Atheros.
> Of course. The external rtl usb wifi adapter uses the rtl8187 driver. So, I
> really doubt the linux driver is behind this fixation of bit rate. All I am
> saying is that I did not have this problem when I was on F14. Perhaps
> something above the low lever driver is at work here, either wext driver or
> wpa_supplicant application. I found no settings on the router which would
> set the bitrate per wifi client. The other 3 clients are all at 54 Mb/s.
>
>>
>> You also said that the card worked fine with F14. Although the ath9k
>> driver will most likely have changed between F14 and F16, that wouldn't
>> explain why it works fine at starbucks or why the RTL had the same
>> problem.
> Right.
>>
>> I would say take a look at the router to see if anything unusual is
>> happening there.
>>
>> I have heard before that sometimes dropping the router/card to 802.11b or
>> g can resolve odd problems with 802.11n cards. (Something like 'iwconfig
>> wlan0 rate 54M') Obviously the speed will not be the best, but possibly
>> better than 18Mb/s :-)
>>
>> Finally, if the driver really looks like a possibility, then you could
>> run 'modinfo ath9k' to see what options the driver takes. It may have a
>> debug option to cause further messages to be written to dmesg. Actually,
>> checking dmesg may be a good step anyway (something like 'dmesg | grep
>> ath').
>>
>> (FYI, I have an Atheros USB card which uses the carl9170 driver. The card
>> is 802.11bgn, but my router is only 'b' or 'g'. I get a fairly consistent
>> maximum 54Mb/s :-) )
> I will look to see if the ath9k and the rtl8187 drivers have debug options
> that can be turned on. If they do, then I will have to recompile my
> kernel.
if they do, then there is NO need to recompile the kernel.
modinfo ath9k
shows ...
parm: debug:Debugging mask (uint)
looking at the source would show you the value of the bits (and how many) in
the bit mask. Turning all the bits on might be done like this:
put the line:
options ath9k debug=0xFFFF
into
/etc/modprobe.d/ath9k.conf
and reload the module.
rtl8187 appears not to take any parameters.
All the best,
- -Greg
- --
+---------------------------------------------------------------------+
Please also check the log file at "/dev/null" for additional information.
(from /var/log/Xorg.setup.log)
| Greg Hosler ghosler@xxxxxxxxxx |
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