Comment 13 for bug 1156346

1. Lenovo G580 (20157)

2. There is no BIOS update to this laptop:

"BIOS Update is not required for this product - Lenovo G480 (2688, 20156), G580 (2689, 20157)"

http://support.lenovo.com/en_US/downloads/detail.page?DocID=DS035106

3/A.
Model: Cisco EPC3925
Vendor: Cisco
Hardware Revision: 1.0
Bootloader Revision: 2.3.0_R1
Current Software Revision: epc3925-E15-12-v302r125555-130315c-MYR-TEST
Firmware Name: epc3925-E15-12-v302r125555-130315c-MYR-TEST.bin
Firmware Build Time: Mar 15 17:43:18 2013

3/B. 802.11b & 802.11g mixed

3/C. WEP

3/D. I don't use MAC filtering.

3/E. I don't use QoS/WMM.

3/F. Beacon Interval is 100ms.

3/G. I don't use Router Internal Firewall.

3/a. I don't change any parameter, but i you tell me what i could change, then i will probe it.

4. No. I probe it with 4 different wireless device, but only my Lenovo G580 is effected with the problem.

5.
room0: about 1,5 meters
room1: about 4 meters
room2: about 8 meters

6.
room0: no obstructions
room1: a brick wall (about 200 millimeter tight) and a wood cabinet with clothes.
room2: two brick wall (each is about 150 millimeter tight)

6/A. Yes
room0: no problem good signal
room1: poor signal, signal lost very frequantly
room2: no signal

7. Yes. I maid a test in my workplace with a different AP (other vendor).

8. I don't know.
8/B. I probe with Ubuntu 10.04, the problem also exists.

9. Yes the problem still exists.
"I test with the lastest mainline kernel, but the bug is still exists.

$ uname -a
Linux nystul 3.10.0-031000rc2-generic #201305201835 SMP Mon May 20 22:36:26 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

$ md5sum linux-*
bd60aed377a6dd96e47db69ae75865d1 linux-headers-3.10.0-031000rc2-generic_3.10.0-031000rc2.201305201835_amd64.deb
1adb48792cbd7f3d2c15a3e93c60f552 linux-headers-3.10.0-031000rc2_3.10.0-031000rc2.201305201835_all.deb
6517d4d097fbe2052f5feb49f3351869 linux-image-3.10.0-031000rc2-generic_3.10.0-031000rc2.201305201835_amd64.deb"

9/B. I already use compat-wireless drivers, because i need it for my wired AR8162 Fast Ethernet NIC (alx module).
The compat-wireless package isn't help to my problem.

$ cat /proc/version
Linux version 3.5.0-31-generic (buildd@allspice) (gcc version 4.7.2 (Ubuntu/Linaro 4.7.2-2ubuntu1) ) #52-Ubuntu SMP Thu May 16 16:27:05 UTC 2013

$ env COLUMNS=300 dpkg -l linux-backports\*31\*
ii linux-backports-modules-cw-3.6-3.5.0-31-generic 3.5.0-31.18 amd64 compat-wireless Linux modules for version 3.5.0 on x86/x86_64

10. I could start the ndiswrapper 1.58 with the following Windows XP 64 bit driver, but the problem still exits.
I want to probe with Windows 8 driver, but i found that the ndiswrapper doesn't support it's driver format.

$ md5sum x600_wlan785_x_nb.zip xp/XP_7.7.0.348_20090701/ndis5x64/athwx.sys
233ddde287e72d8e4278b7b0047e92ec x600_wlan785_x_nb.zip
d69df98692064f8cb512a67de26605ae xp/XP_7.7.0.348_20090701/ndis5x64/athwx.sys

$ ndiswrapper -l
netathwx : driver installed
 device (168C:002B) present (alternate driver: ath9k)

I found this MSI driver somewhere in the Internet, but i lost the URL, so i put this file to my server:
http://gaia.cc.u-szeged.hu/~szoke/atheros_9285/driver/x600_wlan785_x_nb.zip

+1. Earlier i made a test with FreeBSD (PCBSD 9.1), but the problem is same as in Linux.

$ md5sum PCBSD9.1-x64-USB-live.img
520d07e2304cb75ff73e1df1f0596598 PCBSD9.1-x64-USB-live.img

But in Windows 8 there is no signal problem, so i think the Windows 8 driver made some tricks with this Atheros card.