On 04/26/2010 02:34 PM, Alan Stern wrote: > On Mon, 26 Apr 2010, Ondrej Zary wrote: > >> 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 > > That could be the answer. Clearly this should be handled by the > arch-specific boot/setup code. I don't know enough about it, but other > people do. It looks like idle=nomwait should be the workaround with the least impact at the moment.. _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
