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Date: Mon, 26 Apr 2010 15:17:27 -0400 (EDT)
From: Alan Stern <stern@rowland.harvard.edu>
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To: Ondrej Zary <linux@rainbow-software.org>
cc: linux-pm@lists.linux-foundation.org, <linux-kernel@vger.kernel.org>
Subject: Re: [linux-pm] Invalid opcode on resume from STR on Asus P4P800-VM
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On Mon, 26 Apr 2010, Ondrej Zary wrote:

> Hello,
> I'm trying to debug oops on resume from suspend-to-RAM on Asus P4P800-VM
> mainboard. It crashes with invalid opcode (see below). The kernel is 
> 2.6.32-trunk from Debian but the same problem is present with vanilla
> kernels - both newer and older (but screen remains blank most of the time,
> only keyboard LEDs blink indicating an oops).
> 
> What can cause this problem?
> 
>      8.000339  invalid opcode: 0000 [#1] SMP
>      8.003529  last sysfs file: /sys/power/state
>      8.004265  Modules linked in: sco bridge stp bnep l2cacp crc16 bluetooth rfkill loop i2c_i801 snd_intel8x0 snd_ac97_codec shpchp ac97_bus 
> parport_pc parport
> rng_core pci_hotplug snd_pcsp snd_pcm snd_timer snd soundcore psmouse snd_page_alloc serio_raw evdev processor ext3 jbd mbcache ide_gd_mod 
> ata_generic libata scsi_mod
> ide_pci_generic i915 drm_kms_helper uhci_hcd drm i2c_algo_bit piix i2c_core ehci_hcd intel_agp e100 video ide_core mii floppy agpgart output 
> usbcore nls_base button
> thermal fan thermal_sys [last unloaded: scsi_wait_scan]
> [  148.004265]
> [  148.004265] Pid: 0, comm: swapper Not tainted (2.6.32-trunk-686 #1) To Be Filled By O.E.M.
> [  148.004265] EIP: 0060:[<c1008ff3>] EFLAGS: 00010086 CPU: 0
> [  148.004265] EIP is at mwait_idle+0x4e/0x6c

I had exactly the same problem (on an HP computer with an Intel
chipset).  As far as anyone could figure out, it is caused by a bug in 
the BIOS.  It's not entirely clear that this is the complete answer, 
but nothing else turned up.  See

	http://bugzilla.kernel.org/show_bug.cgi?id=15385

for the complete record.  The best solution I could find was to boot
with "idle=halt" on the command line.  You might check to see if any 
BIOS updates are available.

Alan Stern

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