[Bug 341952] Re: ath5k locks up system in jaunty - "ath5k phy0: noise floor calibration timeout"

cologic ne5 at parsoma.net
Sat May 30 19:04:40 UTC 2009

I experience this locking up on a desktop if I don't blacklist the ath5k
module. It's new in Jaunty as well. Whilst it did first appear sometime
around Jaunty moving from the beta to the release candidate, I also
tried the Ubuntu kernel PPA release of 2.6.30rc4 (
http://kernel.ubuntu.com/~kernel-ppa/mainline/v2.6.30-rc4/ ), but the
same issues occur. I'm running no non-free or restricted kernel modules.

Finally, I encountered noise floor calibration issues in dmesg fairly
frequently (I didn't save any of the logs to check) - it was akin to
what's reported in https://bugzilla.redhat.com/show_bug.cgi?id=452491
however, in particular having that error message ("noise floor
calibration timeout") I believe verbatim. It spammed dmesg so much that
the boot messages in dmesg were gone within a few hours. However, I
don't remember whether this also occurred in the working-(Ubuntu-Jaunty-
beta)-kernel or whether its appearance correlates with the hard locks

relevant dpkg output:
ii  linux-image-2.6.28-11-generic              2.6.28-11.42                                 Linux kernel image for version 2.6.28 on x86
ii  linux-image-2.6.30-020630rc4-generic       2.6.30-020630rc4                             Linux kernel image for version 2.6.30 on x86
ii  linux-image-generic                                               Generic Linux kernel image
ii  linux-restricted-modules-2.6.28-11-generic 2.6.28-11.15                                 Non-free Linux kernel modules for version 2.
ii  linux-restricted-modules-common            2.6.28-11.15                                 Non-free Linux 2.6.28 modules helper script
ii  linux-restricted-modules-generic                                  Restricted Linux modules for generic kernels

Abridged lspci information:
05:00.0 Ethernet controller: Atheros Communications Inc. Atheros AR5001X+ Wireless Network Adapter (rev 01)
	Subsystem: Netgear Device 5a00
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 64 (2500ns min, 7000ns max), Cache Line Size: 32 bytes
	Interrupt: pin A routed to IRQ 10
	Region 0: Memory at febf0000 (32-bit, non-prefetchable) [size=64K]
	Capabilities: [44] Power Management version 2
		Flags: PMEClk- DSI- D1- D2- AuxCurrent=375mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
		Status: D0 PME-Enable- DSel=0 DScale=2 PME-
	Kernel modules: ath5k

** Bug watch added: Red Hat Bugzilla #452491

ath5k locks up system  in jaunty - "ath5k phy0: noise floor calibration timeout"  
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