Re: [tlug] problems with wifi

[Alexander Danilov <alexander.a.danilov@example.com>]

14.05.2011 15:40, Michal Hajek пишет:
> Hello,
>
> I have thinkpad x61s with gentoo installed. All works more or less ok,
> with notable exception of my wifi card.
>
> lspci shows:
> 03:00.0 Network controller: Intel Corporation PRO/Wireless 3945ABG [Golan] Network Connection (rev 02)
>
>    # dmesg |grep iwl
>    [    3.060549] iwl3945: Intel(R) PRO/Wireless 3945ABG/BG Network Connection driver for Linux, in-tree:ds
>    [    3.060553] iwl3945: Copyright(c) 2003-2010 Intel Corporation
>    [    3.069102] iwl3945 0000:03:00.0: PCI INT A ->  GSI 17 (level, low) ->  IRQ 17
>    [    3.069118] iwl3945 0000:03:00.0: setting latency timer to 64
>    [    3.134325] iwl3945 0000:03:00.0: Tunable channels: 13 802.11bg, 23 802.11a channels
>    [    3.134330] iwl3945 0000:03:00.0: Detected Intel Wireless WiFi Link 3945ABG
>    [    3.134487] iwl3945 0000:03:00.0: irq 44 for MSI/MSI-X
>    [    3.138790] phy0: Selected rate control algorithm 'iwl-3945-rs'
>
>
> rfkill switch is on (enable wifi).
>
> I can " ip link set dev wlan0 up" or "ifconfig wlan0 up" - no problem.
>
> 'ip a' than shows:
> 6: wlan0:<NO-CARRIER,BROADCAST,MULTICAST,UP>  mtu 1500 qdisc mq state DOWN qlen 1000
>      link/ether 00:1f:3c:37:a9:c2 brd ff:ff:ff:ff:ff:ff
>
> So far so good. But now the problem starts:
>
> # iwconfig
> wlan0     no wireless extensions.
>
> # iwlist wlan0 scan
> wlan0     Interface doesn't support scanning.
>
> Here are some potentialy usefull informations:
> # uname -a
> Linux toki 2.6.35-gentoo-r1 #2 SMP PREEMPT Sun Aug 15 09:38:23 CEST 2010 x86_64 Intel(R) Core(TM)2 Duo CPU L7500 @ 1.60GHz GenuineIntel GNU/Linux
>
> .config for my kernel is here:
> http://material.karlov.mff.cuni.cz/people/hajek/tlug/.config
>
> Also, after consulting gentoo wiki:
> http://en.gentoo-wiki.com/wiki/Iwlwifi#Kernels_.3E.3D2.6.30
>
> I have tried various things - reemergin net-wireless/iwl3945-ucode, both
> modprobe -r iwl3945
> modprobe iwl3945 disable_hw_scan=1
>
> and also
> modprobe -r iwl3945
> modprobe iwl3945 disable_hw_scan=0
>
> unfortunately - scanning did not work either way.
>
> One more thing - I have a working kernel 2.6.28 where wifi scanning
> works fine, proving my hw is OK. Unfortunately, I do not have .config
> for that particular kernel. The kernel driver has changed anyway, since
> 2.6.28 uses wmaster0 together with wlan0 interface.
>
> Does anybody have an idea what I could be doing wrong?

This Intel card works unstable, I think it depends on version of firmware+kernel version.
But anyway, try:

modprobe iwl3945 fw_restart3945=1

It often helps for many iwl cards.