linux-kernel - Re: dmesg spam: "PnPBIOS: pnp_dock_thread: unexpected status 0x5 flooding"

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Date:	Wed, 12 Nov 2014 19:15:37 +0100
From:	devzero@....de
To:	"One Thousand Gnomes" <gnomes@...rguk.ukuu.org.uk>
Cc:	linux-kernel@...r.kernel.org, rafael.j.wysocki@...el.com
Subject: Re: dmesg spam: "PnPBIOS: pnp_dock_thread: unexpected status 0x5
 flooding"

> Change the default to
> 
>               default:
>                   pnpbios_print_status("pnp_dock..... etc)
> 	          printk(KERN_ERR "PnPBIOS: Disabling dock monitoring\n");
> 	          complete_and_exit(&unload_sem, 0);
> 
> that should produce you one error message, a warning that dock monitoring
> is being disabled and then it should stfu.
> 
> If you can let us know if that does the trick then I can push it upstream.

works perfectly - thanks very much !

[    9.712027] Switching to clocksource tsc
[    9.903305] udevd[42]: starting version 175
[   10.637309] natsemi dp8381x driver, version 2.1, Sept 11, 2006
[   10.637345]   originally by Donald Becker <becker@...ld.com>
[   10.637371]   2.4.x kernel port by Jeff Garzik, Tjeerd Mulder
[   10.700287] natsemi 0000:00:0f.0: setting latency timer to 64
[   10.880548] natsemi eth0: NatSemi DP8381[56] at 0x8010000 (0000:00:0f.0), 00:00:00:00:00:00, IRQ 10, port TP.
[   11.025143] PnPBIOS: pnp_dock_thread: unexpected status 0x5
>[  11.026800] PnPBIOS: Disabling dock monitoring
[   11.518269] SCSI subsystem initialized
[   11.550857] usbcore: registered new interface driver usbfs


> I've not seen other reports of pnp_dock_thread errors with a real dock.
> The only reports at all are a couple of old ones in google that seem to
> be similar and a Debian bug (294652) which appears to be your bug so I'd

indeed - seems a rather weird/rare/old one. 

glad that you fixed it, though. thanks again!

roland


> Gesendet: Montag, 10. November 2014 um 14:54 Uhr
> Von: "One Thousand Gnomes" <gnomes@...rguk.ukuu.org.uk>
> An: devzero@....de
> Cc: linux-kernel@...r.kernel.org, rafael.j.wysocki@...el.com
> Betreff: Re: dmesg spam: "PnPBIOS: pnp_dock_thread: unexpected status 0x5 flooding"
>
> On Fri, 7 Nov 2014 00:54:31 +0100
> devzero@....de wrote:
> 
> > Hi, 
> > 
> > on an ancient GX1 Geode embedded board (Evo T20/Wyse wt3235le Thin Client, which are cheap (<$10) and low power x86 embeded platform) , dmesg is getting constantly spammed with "PnPBIOS: pnp_dock_thread: unexpected status 0x5" during and after boot. 
> > 
> > Any ideas what this means and how to stop that?
> > 
> > It seems it comes from drivers/pnp/pnpbios/bioscalls.c -> pnpbios_print_status()  
> > 
> > Tried adding pnpbios=off, but with that the system does not boot anymore.
> > 
> > Being curious, why a non-existing docking-station is being "polled at regular intervals" (i.e. every 2 seconds - see drivers/pnp/pnpbios/core.c )
> 
> We poll for a dock, and if the BIOS reports that the function is not
> supported we then exit the thread.
> 
> > 
> > >From http://books.google.de/books?id=ibLa4I5EnC4C&pg=PA231&lpg=PA231&dq=pnp+docking+bios&source=bl&ots=ekCFm34U_B&sig=9Z9L55IAL7_3NtuM10jT3serncM&hl=de&sa=X&ei=mAZcVILnJsviO-r5gNgI&ved=0CCsQ6AEwAQ#v=onepage&q=pnp%20docking%20bios&f=false   i read:  "Function 05h - Get Docking Status Information at page 251" 
> 
> The spec is available at:
> 
> http://download.intel.com/support/motherboards/desktop/sb/pnpbiosspecificationv10a.pdf
>  
> > it  seems this is being the result of a "docking event" ? Does this mean, my system is erroneusly generating such docking events, even if there is no docking station at all?
> 
> Your BIOS appears to be making strange replies. Any error ought to have
> the top bit set, so its reporting a nonsense value for some reason.
> 
> I've not seen other reports of pnp_dock_thread errors with a real dock.
> The only reports at all are a couple of old ones in google that seem to
> be similar and a Debian bug (294652) which appears to be your bug so I'd
> suggest testing the following
> 
> 
> Change the default to
> 
>               default:
>                   pnpbios_print_status("pnp_dock..... etc)
> 	          printk(KERN_ERR "PnPBIOS: Disabling dock monitoring\n");
> 	          complete_and_exit(&unload_sem, 0);
> 
> that should produce you one error message, a warning that dock monitoring
> is being disabled and then it should stfu.
> 
> If you can let us know if that does the trick then I can push it upstream.
> 
> Alan
> 
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