On Friday 25 June 2010 18:52:18 Enrico Weigelt wrote: > Hi folks, > > > my Atheros wlan (builtin, internal intenna) is regularily > loosing link. Reproducible in various different networks. > At home, my wlan ap is about 2 meter away (within the room), > so link quality (currently 53) shouldnt be the problem. > > Does anyone know what could cause the problem ? > > # cat /proc/version > > Linux version 2.6.31-gentoo-r10 (r...@excalibur.local) \ > (gcc version 4.3.4 (Gentoo 4.3.4 p1.0, pie-10.1.5) ) \ > #1 SMP Wed Jun 2 00:51:13 CEST 2010 > > # lspci -v > ... > > 02:00.0 Network controller: Atheros Communications Inc. AR9285 Wireless > Network Adapter (PCI-Express) (rev 01) Subsystem: Askey Computer Corp. > Device 7167 > Flags: bus master, fast devsel, latency 0, IRQ 16 > Memory at f6000000 (64-bit, non-prefetchable) [size=64K] > Capabilities: [40] Power Management version 3 > Capabilities: [50] MSI: Enable- Count=1/1 Maskable- 64bit- > Capabilities: [60] Express Legacy Endpoint, MSI 00 > Capabilities: [100] Advanced Error Reporting > Capabilities: [140] Virtual Channel <?> > Capabilities: [160] Device Serial Number 00-15-17-ff-ff-24-14-12 > Capabilities: [170] Power Budgeting <?> > Kernel driver in use: ath9k > Kernel modules: ath9k > ... > > > Jun 25 19:36:51 excalibur kernel: wlan0: no probe response from AP > 00:23:08:86:d6:8f - disassociating Jun 25 19:36:51 excalibur > dhcpcd[10182]: wlan0: carrier lost
I have seen the same problem with my internal broadcom card and of course a different driver. If you check google there seem to be pages and pages of users reporting such a problem on different distros and with different makes of wireless cards. The jury's out as to what's causing this. Is it related to modern cards with low power management capabilities and how this may interact with the kernel, or is it something to do with the tolerance built into TTL packets between the card and the AP? With regards to my card I have noticed that at home I stay connected for hours on end, at work it's a miracle if I stay online for longer than 5 minutes (both on the same channel). This to me says that the problem is one of interaction with the router, which points to tolerance on the TTL packets. Of course YMMV ... -- Regards, Mick
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