Hi, I have just booted Linux 2.6.17 on an old 350 MHz PII, and have discovered this message in the boot log: setup_irq: irq handler mismatch <c0131a86> setup_irq+0x10d/0x11a <c01f3889> serial8250_interrupt+0x0/0x107 <c0131b00> request_irq+0x6d/0x89 <c01f34ba> serial8250_startup+0x2d6/0x42b <c01f01e1> uart_startup+0x64/0x121 <c01f0401> uart_open+0x163/0x3a2 <c01e214f> tty_open+0x175/0x2bc <c0152fb1> chrdev_open+0x160/0x17c <c0152e51> chrdev_open+0x0/0x17c <c014b093> __dentry_open+0xe0/0x1cf <c014b1e6> nameidata_to_filp+0x19/0x28 <c014b220> do_filp_open+0x2b/0x31 <c014b30c> do_sys_open+0x3c/0xa9 <c014b3a6> sys_open+0x16/0x18 <c0102adb> syscall_call+0x7/0xb Here is the full boot-log, to put this in context: Linux version 2.6.17 (chris@xxxxxxxxxxxxxxxxx) (gcc version 4.0.2 20051125 (Red Hat 4.0.2-8)) #1 PREEMPT Mon Jun 19 17:19:42 BST 2006 BIOS-provided physical RAM map: BIOS-e820: 0000000000000000 - 000000000009f800 (usable) BIOS-e820: 000000000009f800 - 00000000000a0000 (reserved) BIOS-e820: 00000000000e7000 - 0000000000100000 (reserved) BIOS-e820: 0000000000100000 - 0000000017ffdc00 (usable) BIOS-e820: 0000000017ffdc00 - 0000000017fffc00 (ACPI data) BIOS-e820: 0000000017fffc00 - 0000000018000000 (ACPI NVS) BIOS-e820: 00000000fffe7000 - 0000000100000000 (reserved) 383MB LOWMEM available. On node 0 totalpages: 98301 DMA zone: 4096 pages, LIFO batch:0 Normal zone: 94205 pages, LIFO batch:31 DMI 2.1 present. ACPI: RSDP (v000 PTLTD ) @ 0x000f6ad0 ACPI: RSDT (v001 PTLTD RSDT 0x00000001 PTL 0x01000000) @ 0x17ffdd69 ACPI: FADT (v001 INTEL SEATTLE2 0x20000817 PTL 0x000f4240) @ 0x17fffb8c ACPI: DSDT (v001 Intel S2440BX 0x00000001 MSFT 0x01000004) @ 0x00000000 ACPI: PM-Timer IO Port: 0x8008 Allocating PCI resources starting at 20000000 (gap: 18000000:e7fe7000) Built 1 zonelists Kernel command line: ro root=LABEL=/ lapic video=matroxfb:vesa:0x117 nmi_watchdog=1 clock=tsc Local APIC disabled by BIOS -- reenabling. Found and enabled local APIC! mapped APIC to ffffd000 (fee00000) Enabling fast FPU save and restore... done. Initializing CPU#0 CPU 0 irqstacks, hard=c032d000 soft=c032e000 PID hash table entries: 2048 (order: 11, 8192 bytes) Detected 349.232 MHz processor. Using tsc for high-res timesource Console: colour VGA+ 80x25 Dentry cache hash table entries: 65536 (order: 6, 262144 bytes) Inode-cache hash table entries: 32768 (order: 5, 131072 bytes) Memory: 385564k/393204k available (1494k kernel code, 7076k reserved, 550k data, 156k init, 0k highmem) Checking if this processor honours the WP bit even in supervisor mode... Ok. Calibrating delay using timer specific routine.. 699.62 BogoMIPS (lpj=1399255) Mount-cache hash table entries: 512 CPU: After generic identify, caps: 0183fbff 00000000 00000000 00000000 00000000 00000000 00000000 CPU: After vendor identify, caps: 0183fbff 00000000 00000000 00000000 00000000 00000000 00000000 CPU: L1 I cache: 16K, L1 D cache: 16K CPU: L2 cache: 512K CPU: After all inits, caps: 0183fbff 00000000 00000000 00000040 00000000 00000000 00000000 Intel machine check architecture supported. Intel machine check reporting enabled on CPU#0. CPU: Intel Pentium II (Deschutes) stepping 02 Checking 'hlt' instruction... OK. SMP alternatives: switching to UP code Freeing SMP alternatives: 0k freed ACPI: setting ELCR to 0200 (from 0e20) checking if image is initramfs... it is Freeing initrd memory: 1062k freed NET: Registered protocol family 16 ACPI: bus type pci registered PCI: PCI BIOS revision 2.10 entry at 0xfd9b4, last bus=1 Setting up standard PCI resources ACPI: Subsystem revision 20060127 ACPI: Interpreter enabled ACPI: Using PIC for interrupt routing ACPI: PCI Root Bridge [PCI0] (0000:00) PCI: Probing PCI hardware (bus 00) ACPI: Assume root bridge [\_SB_.PCI0] bus is 0 PCI quirk: region 8000-803f claimed by PIIX4 ACPI PCI quirk: region 7000-700f claimed by PIIX4 SMB Boot video device is 0000:01:00.0 ACPI: PCI Interrupt Routing Table [\_SB_.PCI0._PRT] ACPI: PCI Interrupt Link [LNKA] (IRQs 3 4 5 7 9 10 *11 12) ACPI: PCI Interrupt Link [LNKB] (IRQs 3 4 *5 7 9 10 11 12) ACPI: PCI Interrupt Link [LNKC] (IRQs 3 4 5 7 9 *10 11 12) ACPI: PCI Interrupt Link [LNKD] (IRQs 3 4 5 7 *9 10 11 12) ACPI: Power Resource [PFAN] (on) Linux Plug and Play Support v0.97 (c) Adam Belay pnp: PnP ACPI init pnp: PnP ACPI: found 12 devices usbcore: registered new driver usbfs usbcore: registered new driver hub PCI: Using ACPI for IRQ routing PCI: If a device doesn't work, try "pci=routeirq". If it helps, post a report TC classifier action (bugs to netdev@xxxxxxxxxxxxxxx cc hadi@xxxxxxxxxx) pnp: 00:01: ioport range 0x7000-0x700f has been reserved pnp: 00:01: ioport range 0x8000-0x803f could not be reserved PCI: Bridge: 0000:00:01.0 IO window: disabled. MEM window: f4100000-f4ffffff PREFETCH window: fc000000-fdffffff NET: Registered protocol family 2 IP route cache hash table entries: 4096 (order: 2, 16384 bytes) TCP established hash table entries: 16384 (order: 4, 65536 bytes) TCP bind hash table entries: 8192 (order: 3, 32768 bytes) TCP: Hash tables configured (established 16384 bind 8192) TCP reno registered audit: initializing netlink socket (disabled) audit(1150736964.248:1): initialized Total HugeTLB memory allocated, 0 VFS: Disk quotas dquot_6.5.1 Dquot-cache hash table entries: 1024 (order 0, 4096 bytes) Initializing Cryptographic API io scheduler noop registered io scheduler deadline registered (default) io scheduler cfq registered Limiting direct PCI/PCI transfers. ACPI: PCI Interrupt Link [LNKA] enabled at IRQ 11 PCI: setting IRQ 11 as level-triggered ACPI: PCI Interrupt 0000:01:00.0[A] -> Link [LNKA] -> GSI 11 (level, low) -> IRQ 11 matroxfb: Matrox G400 (AGP) detected PInS memtype = 3 matroxfb: MTRR's turned on matroxfb: 1024x768x16bpp (virtual: 1024x8192) matroxfb: framebuffer at 0xFC000000, mapped to 0xd8880000, size 33554432 Console: switching to colour frame buffer device 128x48 fb0: MATROX frame buffer device matroxfb_crtc2: secondary head of fb0 was registered as fb1 ACPI: Fan [FAN1] (on) ACPI: CPU0 (power states: C1[C1] C2[C2]) isapnp: Scanning for PnP cards... isapnp: No Plug & Play device found Real Time Clock Driver v1.12ac Serial: 8250/16550 driver $Revision: 1.90 $ 4 ports, IRQ sharing enabled serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A pnp: Device 00:07 activated. 00:07: ttyS2 at I/O 0x3e8 (irq = 4) is a 16550A pnp: Device 00:08 activated. 00:08: ttyS1 at I/O 0x2f8 (irq = 3) is a 16550A RAMDISK driver initialized: 16 RAM disks of 16384K size 1024 blocksize Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2 ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx PIIX4: IDE controller at PCI slot 0000:00:07.1 PIIX4: chipset revision 1 PIIX4: not 100% native mode: will probe irqs later ide0: BM-DMA at 0x1060-0x1067, BIOS settings: hda:DMA, hdb:DMA ide1: BM-DMA at 0x1068-0x106f, BIOS settings: hdc:DMA, hdd:pio Probing IDE interface ide0... hda: QUANTUM FIREBALL EL7.6A, ATA DISK drive hdb: ExcelStor Technology J680, ATA DISK drive ide0 at 0x1f0-0x1f7,0x3f6 on irq 14 Probing IDE interface ide1... hdc: Pioneer DVD-ROM ATAPIModel DVD-106S 012, ATAPI CD/DVD-ROM drive ide1 at 0x170-0x177,0x376 on irq 15 hda: max request size: 128KiB hda: 15032115 sectors (7696 MB) w/418KiB Cache, CHS=15907/15/63, UDMA(33) hda: cache flushes not supported hda: hda1 hdb: max request size: 512KiB hdb: 160836480 sectors (82348 MB) w/1794KiB Cache, CHS=16383/255/63, UDMA(33) hdb: cache flushes supported hdb: hdb1 hdb2 hdb3 hdb4 < hdb5 hdb6 > PNP: PS/2 Controller [PNP0303:KBC,PNP0f13:MICE] at 0x60,0x64 irq 1,12 serio: i8042 AUX port at 0x60,0x64 irq 12 serio: i8042 KBD port at 0x60,0x64 irq 1 mice: PS/2 mouse device common for all mice TCP bic registered NET: Registered protocol family 1 NET: Registered protocol family 17 Testing NMI watchdog ... OK. Using IPI Shortcut mode ACPI wakeup devices: PCI0 USB0 UAR1 UAR2 KBC MICE ACPI: (supports S0 S1 S5) Freeing unused kernel memory: 156k freed input: AT Translated Set 2 keyboard as /class/input/input0 kjournald starting. Commit interval 5 seconds EXT3-fs: mounted filesystem with ordered data mode. input: ImExPS/2 Generic Explorer Mouse as /class/input/input1 hdc: ATAPI 40X DVD-ROM drive, 256kB Cache, UDMA(33) Uniform CD-ROM driver Revision: 3.20 Driver for 1-wire Dallas network protocol. Floppy drive(s): fd0 is 1.44M FDC 0 is a post-1991 82077 ne.c:v1.10 9/23/94 Donald Becker (becker@xxxxxxxxx) Last modified Nov 1, 2000 by Paul Gortmaker NE*000 ethercard probe at 0x300: 00 c0 f0 44 02 eb eth%d: NE2000 found at 0x300, using IRQ 3. ACPI: PCI Interrupt Link [LNKC] enabled at IRQ 10 PCI: setting IRQ 10 as level-triggered ACPI: PCI Interrupt 0000:00:0f.0[A] -> Link [LNKC] -> GSI 10 (level, low) -> IRQ 10 usbcore: registered new driver snd-usb-audio piix4_smbus 0000:00:07.3: Found 0000:00:07.3 device Linux agpgart interface v0.101 (c) Dave Jones agpgart: Detected an Intel 440BX Chipset. agpgart: AGP aperture is 64M @ 0xf8000000 ACPI: PCI Interrupt Link [LNKD] enabled at IRQ 9 PCI: setting IRQ 9 as level-triggered ACPI: PCI Interrupt 0000:00:0e.2[C] -> Link [LNKD] -> GSI 9 (level, low) -> IRQ 9 ehci_hcd 0000:00:0e.2: EHCI Host Controller ehci_hcd 0000:00:0e.2: new USB bus registered, assigned bus number 1 ehci_hcd 0000:00:0e.2: irq 9, io mem 0xf4002000 ehci_hcd 0000:00:0e.2: USB 2.0 started, EHCI 0.95, driver 10 Dec 2004 usb usb1: configuration #1 chosen from 1 choice hub 1-0:1.0: USB hub found hub 1-0:1.0: 5 ports detected ohci_hcd: 2005 April 22 USB 1.1 'Open' Host Controller (OHCI) Driver (PCI) ACPI: PCI Interrupt Link [LNKB] enabled at IRQ 5 PCI: setting IRQ 5 as level-triggered ACPI: PCI Interrupt 0000:00:0e.0[A] -> Link [LNKB] -> GSI 5 (level, low) -> IRQ 5 ohci_hcd 0000:00:0e.0: OHCI Host Controller ohci_hcd 0000:00:0e.0: new USB bus registered, assigned bus number 2 ohci_hcd 0000:00:0e.0: irq 5, io mem 0xf4000000 usb usb2: configuration #1 chosen from 1 choice hub 2-0:1.0: USB hub found hub 2-0:1.0: 3 ports detected ACPI: PCI Interrupt 0000:00:0e.1[B] -> Link [LNKC] -> GSI 10 (level, low) -> IRQ 10 ohci_hcd 0000:00:0e.1: OHCI Host Controller ohci_hcd 0000:00:0e.1: new USB bus registered, assigned bus number 3 ohci_hcd 0000:00:0e.1: irq 10, io mem 0xf4001000 usb usb3: configuration #1 chosen from 1 choice hub 3-0:1.0: USB hub found hub 3-0:1.0: 2 ports detected USB Universal Host Controller Interface driver v3.0 ACPI: PCI Interrupt 0000:00:07.2[D] -> Link [LNKD] -> GSI 9 (level, low) -> IRQ 9 uhci_hcd 0000:00:07.2: UHCI Host Controller uhci_hcd 0000:00:07.2: new USB bus registered, assigned bus number 4 uhci_hcd 0000:00:07.2: irq 9, io base 0x00001040 usb usb4: configuration #1 chosen from 1 choice hub 4-0:1.0: USB hub found hub 4-0:1.0: 2 ports detected usb 4-1: new full speed USB device using uhci_hcd and address 2 usb 4-1: configuration #1 chosen from 1 choice ACPI: Power Button (FF) [PWRF] Linux video capture interface: v1.00 pwc Philips webcam module version 9.0.2-unofficial loaded. pwc Supports Philips PCA645/646, PCVC675/680/690, PCVC720[40]/730/740/750 & PCVC830/840. pwc Also supports the Askey VC010, various Logitech Quickcams, Samsung MPC-C10 and MPC-C30, pwc the Creative WebCam 5 & Pro Ex, SOTEC Afina Eye and Visionite VCS-UC300 and VCS-UM100. pwc Logitech QuickCam Zoom USB webcam detected. pwc Registered as /dev/video0. usbcore: registered new driver Philips webcam device-mapper: 4.6.0-ioctl (2006-02-17) initialised: dm-devel@xxxxxxxxxx EXT3 FS on hdb2, internal journal kjournald starting. Commit interval 5 seconds EXT3 FS on hdb1, internal journal EXT3-fs: mounted filesystem with ordered data mode. kjournald starting. Commit interval 5 seconds EXT3 FS on hdb6, internal journal EXT3-fs: mounted filesystem with ordered data mode. kjournald starting. Commit interval 5 seconds EXT3 FS on hdb5, internal journal EXT3-fs: mounted filesystem with ordered data mode. Adding 1020116k swap on /dev/hdb3. Priority:-1 extents:1 across:1020116k ip_tables: (C) 2000-2006 Netfilter Core Team Netfilter messages via NETLINK v0.30. ip_conntrack version 2.4 (3071 buckets, 24568 max) - 220 bytes per conntrack NET: Registered protocol family 10 lo: Disabled Privacy Extensions IPv6 over IPv4 tunneling driver audit(1150737028.384:2): audit_pid=1891 old=0 by auid=4294967295 i2c_adapter i2c-0: found ADM9240 revision 2 adm9240 0-002d: Using VRM: 8.2 adm9240 0-002d: cold start: config was 0x08 mode 1 parport: PnPBIOS parport detected. parport0: PC-style at 0x378 (0x778), irq 7, dma 3 [PCSPP,TRISTATE,COMPAT,ECP,DMA] parport0: Printer, Hewlett-Packard OfficeJet Series 700 lp0: using parport0 (interrupt-driven). lp0: ECP mode setup_irq: irq handler mismatch <c0131a86> setup_irq+0x10d/0x11a <c01f3889> serial8250_interrupt+0x0/0x107 <c0131b00> request_irq+0x6d/0x89 <c01f34ba> serial8250_startup+0x2d6/0x42b <c01f01e1> uart_startup+0x64/0x121 <c01f0401> uart_open+0x163/0x3a2 <c01e214f> tty_open+0x175/0x2bc <c0152fb1> chrdev_open+0x160/0x17c <c0152e51> chrdev_open+0x0/0x17c <c014b093> __dentry_open+0xe0/0x1cf <c014b1e6> nameidata_to_filp+0x19/0x28 <c014b220> do_filp_open+0x2b/0x31 <c014b30c> do_sys_open+0x3c/0xa9 <c014b3a6> sys_open+0x16/0x18 <c0102adb> syscall_call+0x7/0xb eth0: no IPv6 routers present input: PC Speaker as /class/input/input2 pwc Deregistering driver. usbcore: deregistering driver Philips webcam pwc Philips webcam module removed. pwc: Philips webcam module version 10.0.12-rc1 loaded. pwc: Supports Philips PCA645/646, PCVC675/680/690, PCVC720[40]/730/740/750 & PCVC830/840. pwc: Also supports the Askey VC010, various Logitech Quickcams, Samsung MPC-C10 and MPC-C30, pwc: the Creative WebCam 5 & Pro Ex, SOTEC Afina Eye and Visionite VCS-UC300 and VCS-UM100. pwc: Logitech QuickCam Zoom USB webcam detected. pwc: Registered as /dev/video0. usbcore: registered new driver Philips webcam u32 classifier Actions configured [drm] Initialized drm 1.0.1 20051102 ACPI: PCI Interrupt 0000:01:00.0[A] -> Link [LNKA] -> GSI 11 (level, low) -> IRQ 11 [drm] Initialized mga 3.2.2 20060319 on minor 0: [drm] Used old pci detect: framebuffer loaded agpgart: Found an AGP 1.0 compliant device at 0000:00:00.0. agpgart: Putting AGP V2 device at 0000:00:00.0 into 2x mode agpgart: Putting AGP V2 device at 0000:01:00.0 into 2x mode ISO 9660 Extensions: Microsoft Joliet Level 3 ISOFS: changing to secondary root And this is what /proc/interrupts has to say: $ cat /proc/interrupts CPU0 0: 826224 XT-PIC timer 1: 2446 XT-PIC i8042 2: 0 XT-PIC cascade 3: 5189 XT-PIC NE2000 5: 0 XT-PIC ohci_hcd:usb2 7: 1 XT-PIC parport0 8: 1 XT-PIC rtc 9: 153 XT-PIC acpi, ehci_hcd:usb1, uhci_hcd:usb4 10: 132 XT-PIC Ensoniq AudioPCI, ohci_hcd:usb3 11: 192707 XT-PIC mga@pci:0000:01:00.0 12: 32048 XT-PIC i8042 14: 18574 XT-PIC ide0 15: 6705 XT-PIC ide1 NMI: 889 LOC: 826247 ERR: 0 MIS: 0 Cheers, Chris ___________________________________________________________ Try the all-new Yahoo! 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