On my Lenovo T500 and T510 everytime I update my system to the 3.2+ trunk of the kernel, I get intermittent connection to my wifi connection. It always says I am connected but I can't ping out regularly, can't update my system because I can't connect to the servers, can't install new software, and can't do any work online. This is a no go for me on the system, if I reset my wifi connection ... ie turn off the radio and then turn it back on ... it seems to work again for maybe a minute and then it doesn't work again. As such at this time I have to downgrade my kernel to 3.0. The connection should be stable, this is no longer about an issue with my laptop, as I have tested it extensively. The issue seems to be with the updated kernel. I pride myself in being bleeding edge and now I can no longer do this with Linux as I do not have a stable connection, or any connection for that matter, past the 3.0 branch of the kernel.
What hardware are you using? What is the earliest kernel that displays the problem? And the latest that does not have the problem? Have you done a git bisect of the issue?
Created attachment 72982 [details] lshw on the box
Attached my hardware list (via lshw) Earliest kernel where I have experienced this is 3.2 the latest that I have not seen it is 3.0 (didn't test 3.1), I dont know how to do a git bisect.
I concur/have same issue.. Xubuntu 12.04.. running 3.2.. generic-pae now.. Same intermittent wifi.. As described..
description: Wireless interface product: Centrino Ultimate-N 6300 vendor: Intel Corporation
I confirm this extremely annoying behavior as well - sometimes will stay connected, usually will not. Sometimes will drop instantly, other times after five minutes. - happens on all public wifi systems I have used, open and password protected - I have never had a problem with my home network (router= 2Wire, 2701HG-B) - seems to correlate with signal strength, meaning the times when I can maintain a signal are when I'm in a high strength area. However, signal drops in places where there is plenty of signal (i.e. other laptops are just fine) - when a signal is dropped I usually cannot reconnect without restarting network-manager - it seems like bringing down eth0 helps establish a connection (even though it will be dropped) but this could be more superstitious than anything at this point. Kernel: 3.2.0-31-generic OS: Ubuntu 12.04 Laptop model: 2012 Thinkpad x220t wireless card: Centrino Ultimate-N 6300 lspci -vv -s 03:00.0 03:00.0 Network controller: Intel Corporation Centrino Ultimate-N 6300 (rev 3e) Subsystem: Intel Corporation Centrino Ultimate-N 6300 3x3 AGN Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0, Cache Line Size: 64 bytes Interrupt: pin A routed to IRQ 45 Region 0: Memory at f2400000 (64-bit, non-prefetchable) [size=8K] Capabilities: <access denied> Kernel driver in use: iwlwifi Kernel modules: iwlwifi modinfo iwlwifi alias: iwlagn license: GPL author: Copyright(c) 2003-2011 Intel Corporation <ilw@linux.intel.com> version: in-tree: description: Intel(R) Wireless WiFi Link AGN driver for Linux firmware: iwlwifi-5150-2.ucode firmware: iwlwifi-5000-5.ucode firmware: iwlwifi-6000g2b-6.ucode firmware: iwlwifi-6000g2a-5.ucode firmware: iwlwifi-6050-5.ucode firmware: iwlwifi-6000-4.ucode firmware: iwlwifi-100-5.ucode firmware: iwlwifi-1000-5.ucode firmware: iwlwifi-135-6.ucode firmware: iwlwifi-105-6.ucode firmware: iwlwifi-2030-6.ucode firmware: iwlwifi-2000-6.ucode srcversion: 2EA00FA7EBFF006707244AA
I have the same problem on Ubuntu 12.10 (3.5 kernel). Wifi works for a while but suddenly it just stops working. NetworkManager looks like it's connected with good signal strength but the network doesn't work at all. If I disconnect and reconnect to the AP I just get a message that it couldn't connect and a prompt to enter the password. It works again for a while after a reboot or a sleep/resume cycle (perhaps turning off/on the adapter will work to). This is really annoying of course. I will try with kernel 3.6 from kernel.org now but I guess that wont make a difference. The hardware is a intel centrino wireless-n 6230.
Is this still an issue?