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From: Ondrej Zary <linux@rainbow-software.org>
To: Alan Stern <stern@rowland.harvard.edu>
Subject: Re: [linux-pm] Invalid opcode on resume from STR on Asus P4P800-VM
Date: Mon, 26 Apr 2010 21:55:05 +0200
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On Monday 26 April 2010 21:17:27 Alan Stern wrote:
> 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.

Thanks, it does not crash with "idle=halt" or "idle=poll". According to this:
http://siyobik.info/index.php?module=x86&id=215
the MWAIT instruction can be enabled/disabled in IA32_MISC_ENABLES MSR. Kernel 
probably should enable it at boot and also on resume.
Here's some more info:
http://software.intel.com/en-us/forums/showthread.php?t=63654

-- 
Ondrej Zary
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