Bug 42890

Summary:	iwlwifi: Microcode SW error detected
Product:	Drivers	Reporter:	Munzir Taha (munzirtaha)
Component:	network-wireless	Assignee:	drivers_network-wireless (drivers_network-wireless)
Status:	CLOSED CODE_FIX
Severity:	normal	CC:	alan, funtoos, jody.xha, linville, mvrk, sledz, wey-yi.w.guy
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:	3.4-rc7	Subsystem:
Regression:	No	Bisected commit-id:
Attachments:	dmesg lspci -vvvnn dmesg output

Description Munzir Taha 2012-03-08 16:35:40 UTC

The wifi card is almost unusable. Frequently disconnect unless I used the workaround "options iwlwifi 11n_disable=1"
I filed a bug to my distribution at https://bugs.launchpad.net/ubuntu/+source/linux/+bug/944271 and was redirected upstream.

$ sh ver_linux
If some fields are empty or look unusual you may have an old version.
Compare to the current minimal requirements in Documentation/Changes.
 
Linux GT683R 3.3.0-030300rc6-generic #201203032235 SMP Sun Mar 4 03:36:15 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux
 
Gnu C                  4.6
Gnu make               3.81
binutils               2.22
util-linux             2.20.1
mount                  support
module-init-tools      3.16
e2fsprogs              1.42
pcmciautils            018
PPP                    2.4.5
Linux C Library        2.15
Dynamic linker (ldd)   2.15
Procps                 3.2.8
Net-tools              1.60
Kbd                    1.15.2
Sh-utils               8.13
wireless-tools         30
Modules Loaded         btusb webcamstudio ip6table_filter ip6_tables ebtable_nat ebtables ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack ipt_REJECT xt_CHECKSUM iptable_mangle xt_tcpudp iptable_filter ip_tables x_tables bridge stp kvm_intel kvm dm_crypt parport_pc ppdev rfcomm bnep bluetooth snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep arc4 snd_pcm snd_seq_midi snd_rawmidi snd_seq_midi_event uvcvideo videobuf2_core videodev snd_seq v4l2_compat_ioctl32 videobuf2_vmalloc videobuf2_memops rts5139 iwlwifi snd_timer snd_seq_device dm_multipath mac80211 snd mxm_wmi cfg80211 soundcore snd_page_alloc mac_hid psmouse serio_raw mei wmi lp parport r8169 usbhid hid video

Attached is dmesg and lspci -vvnn

Comment 1 Munzir Taha 2012-03-08 16:41:44 UTC

Created attachment 72556 [details]
dmesg

Comment 2 Munzir Taha 2012-03-08 16:43:11 UTC

Created attachment 72557 [details]
lspci -vvvnn

Comment 3 devsk 2012-05-13 03:24:12 UTC

I am hitting exact same thing. Wifi is unusable on my laptop because of this bug. Its been more than 2 months since this report was filed. Is anyone looking at this issue?

Comment 4 devsk 2012-05-13 04:00:37 UTC

seems like its fixed in 3.4-rc7

Comment 5 devsk 2012-05-15 14:01:13 UTC

I spoke too soon. The only thing fixed in the 3.4-rc7 are the errors related to not being able to attach driver, which led to complete loss of wifi. Now, the wifi works intermittently. Starts off fine but gradually reaches 1Mb/s rate and then disconnects until you rmmod and modprobe again.

11n_disable=1 helps with this (meaning the connection never tapers off to full disconnection) but it limits the speeds and distance from router.

Comment 6 jody 2012-06-08 11:10:45 UTC

Created attachment 73545 [details]
dmesg output

Comment 7 jody 2012-06-08 11:13:59 UTC

I have a similar problem with my Centrino Advanced-N 6235 on gentoo 3.2.12 with net-wireless/iwl6030-ucode (version 17.168.5.2)
The error occurs when i start wpa_supplicant. It is slightly different from the one Munzir Taha describes (c.f. attachment above, ,"dmesg-output")

I'm also curious to know when there will be a fix...

Comment 8 Munzir Taha 2012-09-23 20:43:44 UTC

I am now using ubuntu quantal with linux-image-3.5.0-15-generic (3.5.0-15.22) and I don't see the problem any more.  I would close it as resolved but if any one still have it with the latest kernel, feel free to reopen.