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. Alan Stern _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
