2010/4/3 Larry Finger <Larry.Finger@xxxxxxxxxxxx>: > On 04/03/2010 08:56 AM, Rogerio Luz Coelho wrote: >> Hello, sorry for posting this in a DEV list, but I tried elsewhere and >> people are generally kind, but unhelpfull. I am NOT a kernel >> programer, so I will impose on the list´s good will somewhat ;) >> >> I have a Laptop witch uses the Realtek rtl8187b chip in a USB internal >> conection. >> >> The chip WORKS in kernel Debian 2.6.32-3 , but is has an odd behavior: >> >> It works, connects and gives me ADSL speed as long as I am no more >> than 3 meters from the router. Beyond that I get a "wrong password" >> message in NetworkManager or Wicd (tried them both with similar >> results) > > Your device may behaves very differently from mine. At 15 m from my AP, > my rtl8187B device gets the following performance: > > finger@larrylap:~> tcpperf -c desktop > Duration: 10 573usec > Bytes sent: 4574208 (4467 kB 4 MB 0 GB) > Bandwidth: 3659157 b/s (3659.16 kb/s 3.66 Mb/s) > Close duration: 0s 62usec > > finger@larrylap:~> iwconfig wlan3 > wlan3 IEEE 802.11bg ESSID:"lwfdjf_rad" > Mode:Managed Frequency:2.412 GHz Access Point: 00:14:BF:85:49:FA > Bit Rate=11 Mb/s Tx-Power=20 dBm > Retry long limit:7 RTS thr:off Fragment thr:off > Power Management:off > Link Quality=69/70 Signal level=-41 dBm > Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 > Tx excessive retries:0 Invalid misc:0 Missed beacon:0 > > My device is a Level One WNC-0301USB and shows the following in dmesg: > > finger@larrylap:~> dmesg | grep rtl > [129918.822942] rtl8187: inconsistency between id with OEM info! > [129918.827838] phy1: hwaddr 00:11:6b:3e:c4:0a, RTL8187BvB(early) V0 + > rtl8225z2, rfkill mask 2 > [129918.860071] rtl8187: Customer ID is 0x00 > [129918.860230] Registered led device: rtl8187-phy1::radio > [129918.860333] Registered led device: rtl8187-phy1::tx > [129918.860448] Registered led device: rtl8187-phy1::rx > [129918.862425] rtl8187: wireless switch is on > [129918.863143] usbcore: registered new interface driver rtl8187 > > At my usual distance of 2 m from the AP, the transmit rate is about 13 > Mb/s and the reported signal level is -23 dBm, about what you report. > Our chips are different, but that has not previously been a problem. > > Have you used this device with kernels older than 2.6.32? Fortunately, > it does not need external firmware, thus it works with any Live CD. I > have routinely tested all fairly recent kernels and have never seen this > problem. > > Larry > I have a MS-Win7 instalation on this Laptop and it works 100% even at longer distances than you report,even with walls in between. Will do the tcpperf test as soon as I get home. There are other with the same problem with my exact chip here in Brasil , that is because one of our leading Laptop vendors uses this config. Does it matter that the USB port used in this setting is a connected to a USB HUB and then to the mother board? More details and tests will come your way in a day or two ... will reinstall Mandriva 2010 and do some tests with older kernels. Thaks for the quick reply :) Rogerio -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
