Same problem on my Acer Ferrari 4005 since upgrading to Edgy , with a custom 2.6.18 kernel.
I've tried removing the ochi1394 as suggested by Ralf but that does not resolve the peoblem for me. I still see frequent APIC errors, although they seem to be reduced (slightly) since removing the ohci module. lsmod output is: Module Size Used by binfmt_misc 9868 1 rfcomm 34608 0 hidp 13440 2 l2cap 19976 10 rfcomm,hidp ipv6 250464 10 hci_usb 15708 2 bluetooth 45796 8 rfcomm,hidp,l2cap,hci_usb nfsd 248936 13 exportfs 4928 1 nfsd lockd 61648 2 nfsd sunrpc 147656 8 nfsd,lockd capability 4552 0 commoncap 6336 1 capability fglrx 455540 8 driverloader 296096 0 powernow_k8 10584 0 cpufreq_userspace 3924 0 cpufreq_stats 5256 0 freq_table 4040 2 powernow_k8,cpufreq_stats cpufreq_powersave 1984 0 cpufreq_ondemand 6064 1 cpufreq_conservative 7108 0 video 16392 0 sbs 14456 0 i2c_ec 4928 1 sbs dock 5968 0 button 6240 0 battery 9288 0 container 3904 0 ac 4616 0 asus_acpi 16420 0 af_packet 17612 4 nls_iso8859_1 5504 1 nls_cp437 7168 1 vfat 12032 1 fat 47280 1 vfat dm_mod 52464 0 md_mod 71452 0 sr_mod 14820 0 sbp2 22792 0 scsi_mod 135664 2 sr_mod,sbp2 lp 11080 0 joydev 9984 0 pcmcia 33624 0 snd_atiixp_modem 13516 0 snd_atiixp 17236 1 snd_seq_dummy 3460 0 snd_seq_oss 31616 0 snd_seq_midi 7680 0 snd_rawmidi 22272 1 snd_seq_midi snd_seq_midi_event 7104 2 snd_seq_oss,snd_seq_midi psmouse 39056 0 serio_raw 6340 0 snd_ac97_codec 103448 2 snd_atiixp_modem,snd_atiixp snd_ac97_bus 2688 1 snd_ac97_codec snd_pcm_oss 43392 0 snd_mixer_oss 16384 1 snd_pcm_oss parport_pc 34088 1 parport 35468 2 lp,parport_pc evdev 9856 2 yenta_socket 25100 1 rsrc_nonstatic 10944 1 yenta_socket pcmcia_core 36380 3 pcmcia,yenta_socket,rsrc_nonstatic snd_pcm 76620 4 snd_atiixp_modem,snd_atiixp,snd_ac97_codec,snd_pcm_oss pcspkr 2944 0 shpchp 35624 0 pci_hotplug 29804 1 shpchp i2c_piix4 8908 0 i2c_core 19032 2 i2c_ec,i2c_piix4 snd_seq 50400 6 snd_seq_dummy,snd_seq_oss,snd_seq_midi,snd_seq_midi_event snd_timer 20424 2 snd_pcm,snd_seq snd_seq_device 7508 5 snd_seq_dummy,snd_seq_oss,snd_seq_midi,snd_rawmidi,snd_seq irda 189868 0 crc_ccitt 2240 1 irda snd 54248 13 snd_atiixp_modem,snd_atiixp,snd_seq_oss,snd_rawmidi,snd_ac97_codec,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_seq,snd_timer,snd_seq_device soundcore 8480 1 snd snd_page_alloc 8336 3 snd_atiixp_modem,snd_atiixp,snd_pcm ext3 119568 1 jbd 51248 1 ext3 mbcache 7688 1 ext3 ieee1394 349304 1 sbp2 ehci_hcd 30024 0 ohci_hcd 18692 0 usbcore 124712 5 hci_usb,driverloader,ehci_hcd,ohci_hcd ide_generic 1408 0 [permanent] ide_cd 38944 0 cdrom 36712 2 sr_mod,ide_cd ide_disk 14080 4 generic 6276 0 [permanent] atiixp 5392 0 [permanent] thermal 13264 0 processor 22524 2 powernow_k8,thermal fan 4360 0 vga16fb 11992 0 cfbcopyarea 3968 1 vga16fb vgastate 8256 1 vga16fb cfbimgblt 2944 1 vga16fb cfbfillrect 4416 1 vga16fb -- APIC error on CPU0: 40(40) https://launchpad.net/bugs/66900 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
