I just upgraded a friend's somewhat geriatric i386 box from 5.4-release to 5.5-release. On 5.5 the console is getting spammed with "acpitz0: _AL0[0] _PR0 failed". This didn't happen with 5.4, or for that matter, any previous version of OpenBSD that's been on it that I can remember.
dmesg follows: OpenBSD 5.5 (GENERIC) #276: Wed Mar 5 09:57:06 MST 2014 dera...@i386.openbsd.org:/usr/src/sys/arch/i386/compile/GENERIC cpu0: AMD Athlon(tm) XP ("AuthenticAMD" 686-class, 256KB L2 cache) 1 GHz cpu0: FPU,V86,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR,SSE,MMXX,3DNOW2,3DNOW real mem = 536309760 (511MB) avail mem = 515244032 (491MB) mainbus0 at root bios0 at mainbus0: AT/286+ BIOS, date 12/24/01, BIOS32 rev. 0 @ 0xfb3d0, SMBIOS rev. 2.3 @ 0xf0800 (37 entries) bios0: vendor Award Software International, Inc. version "6.00 PG" date 12/24/2001 bios0: First International Computer, Inc. Product Name acpi0 at bios0: rev 0 acpi0: sleep states S0 S1 S4 S5 acpi0: tables DSDT FACP acpi0: wakeup devices SLPB(S5) USB0(S3) USB1(S3) USB2(S3) LAN0(S5) AC97(S5) MC97(S5) UAR1(S5) LPT1(S5) ECP1(S5) PCI0(S5) acpitimer0 at acpi0: 3579545 Hz, 24 bits acpiprt0 at acpi0: bus 0 (PCI0) acpicpu0 at acpi0: C3, C2 acpitz0 at acpi0: critical temperature is 60 degC acpibtn0 at acpi0: PWRB acpibtn1 at acpi0: SLPB bios0: ROM list: 0xc0000/0xc000 0xcc000/0x8000! 0xd4000/0x4000 cpu0 at mainbus0: (uniprocessor) mtrr: Pentium Pro MTRR support, 8 var ranges, 88 fixed ranges pci0 at mainbus0 bus 0: configuration mode 1 (bios) pchb0 at pci0 dev 0 function 0 "VIA VT8366 PCI" rev 0x00 viaagp0 at pchb0: v2 agp0 at viaagp0: aperture at 0xe0000000, size 0x10000000 ppb0 at pci0 dev 1 function 0 "VIA VT8366 AGP" rev 0x00 pci1 at ppb0 bus 1 vga1 at pci1 dev 0 function 0 "ATI Rage Fury" rev 0x00 wsdisplay0 at vga1 mux 1: console (80x25, vt100 emulation) wsdisplay0: screen 1-5 added (80x25, vt100 emulation) cmpci0 at pci0 dev 9 function 0 "C-Media Electronics CMI8738/C3DX Audio" rev 0x10: irq 11 audio0 at cmpci0 opl at cmpci0 not configured mpu at cmpci0 not configured vr0 at pci0 dev 10 function 0 "VIA VT6105 RhineIII" rev 0x86: irq 11, address 00:15:e9:fa:67:b1 ukphy0 at vr0 phy 1: Generic IEEE 802.3u media interface, rev. 4: OUI 0x004063, model 0x0034 dc0 at pci0 dev 11 function 0 "Lite-On PNIC-II" rev 0x25: irq 11, address 00:a0:cc:68:28:04 dcphy0 at dc0 phy 31: internal PHY uhci0 at pci0 dev 12 function 0 "VIA VT83C572 USB" rev 0x61: irq 5 uhci1 at pci0 dev 12 function 1 "VIA VT83C572 USB" rev 0x61: irq 11 ehci0 at pci0 dev 12 function 2 "VIA VT6202 USB" rev 0x63: irq 11 usb0 at ehci0: USB revision 2.0 uhub0 at usb0 "VIA EHCI root hub" rev 2.00/1.00 addr 1 pciide0 at pci0 dev 14 function 0 "Promise PDC20265" rev 0x02: DMA, channel 0 configured to native-PCI, channel 1 configured to native-PCI pciide0: using irq 5 for native-PCI interrupt pciide0: channel 0 disabled (no drives) pciide0: channel 1 disabled (no drives) viapm0 at pci0 dev 17 function 0 "VIA VT8233 ISA" rev 0x00: SMI iic0 at viapm0 spdmem0 at iic0 addr 0x50: 256MB DDR SDRAM non-parity PC2100CL2.5 spdmem1 at iic0 addr 0x51: 256MB DDR SDRAM non-parity PC2100CL2.5 pciide1 at pci0 dev 17 function 1 "VIA VT82C571 IDE" rev 0x06: ATA100, channel 0 configured to compatibility, channel 1 configured to compatibility wd0 at pciide1 channel 0 drive 1: <WDC WD800BB-00CAA1> wd0: 16-sector PIO, LBA, 76319MB, 156301488 sectors wd0(pciide1:0:1): using PIO mode 4, Ultra-DMA mode 5 atapiscsi0 at pciide1 channel 1 drive 1 scsibus0 at atapiscsi0: 2 targets cd0 at scsibus0 targ 0 lun 0: <LITE-ON, LTR-48125W, VS04> ATAPI 5/cdrom removable cd0(pciide1:1:1): using PIO mode 4, Ultra-DMA mode 2 uhci2 at pci0 dev 17 function 2 "VIA VT83C572 USB" rev 0x1b: irq 5 uhci3 at pci0 dev 17 function 3 "VIA VT83C572 USB" rev 0x1b: irq 5 uhci4 at pci0 dev 17 function 4 "VIA VT83C572 USB" rev 0x1b: irq 5 usb1 at uhci0: USB revision 1.0 uhub1 at usb1 "VIA UHCI root hub" rev 1.00/1.00 addr 1 usb2 at uhci1: USB revision 1.0 uhub2 at usb2 "VIA UHCI root hub" rev 1.00/1.00 addr 1 usb3 at uhci2: USB revision 1.0 uhub3 at usb3 "VIA UHCI root hub" rev 1.00/1.00 addr 1 usb4 at uhci3: USB revision 1.0 uhub4 at usb4 "VIA UHCI root hub" rev 1.00/1.00 addr 1 usb5 at uhci4: USB revision 1.0 uhub5 at usb5 "VIA UHCI root hub" rev 1.00/1.00 addr 1 isa0 at mainbus0 isadma0 at isa0 com0 at isa0 port 0x3f8/8 irq 4: ns16550a, 16 byte fifo com1 at isa0 port 0x2f8/8 irq 3: ns16550a, 16 byte fifo pckbc0 at isa0 port 0x60/5 pckbd0 at pckbc0 (kbd slot) pckbc0: using irq 1 for kbd slot wskbd0 at pckbd0: console keyboard, using wsdisplay0 pcppi0 at isa0 port 0x61 spkr0 at pcppi0 lpt0 at isa0 port 0x378/4 irq 7 wbsio0 at isa0 port 0x2e/2: W83627HF rev 0x17 lm1 at wbsio0 port 0x290/8: W83627HF npx0 at isa0 port 0xf0/16: reported by CPUID; using exception 16 fdc0 at isa0 port 0x3f0/6 irq 6 drq 2 fd0 at fdc0 drive 0: 1.44MB 80 cyl, 2 head, 18 sec vscsi0 at root scsibus1 at vscsi0: 256 targets softraid0 at root scsibus2 at softraid0: 256 targets root on wd0a (56acd3eca180cbd0.a) swap on wd0b dump on wd0b acpitz0: _AL0[0] _PR0 failed acpitz0: _AL0[0] _PR0 failed [many more duplicates of the previous two lines snipped] -- Shawn K. Quinn skqu...@rushpost.com