I get similar errors on a NVidia 750i Motherboard with Pentium D Extreme Edition.. XFX, from whom I got this motherboard have deprecated the kernel and no longer support the Pentium D Extreme Edition, I have a copy of the kernel flash image if you want to have a look, and maybe compare it to the new BIOS flash. I'm using Ubuntu 9.04 32-bit with the additional set of Ubuntu Studio packages, was trying to run the realtime kernel (most recent), and with almost all my USB devices disconnected, only PS/2 Keyboard and a USB Mouse. I tried a number of things, without a clue what would work: Running CPU in normal 3.73 Ghz mode with 800Mhz DRAM. I have overclockable ram, BTW.. 4.256 Ghz, with 800Mhz RAM.. 4.256 with 1000Mhz ram. In every case I got errors. I tried changing the PCI bus latency 32, then 128, then back to 64.. I tried turning hyper-threading off. I haven't tried turning AHCI off. I couldn't find the occurence of DRDY in my log files.. Here is my lshw: blackmesa description: Desktop Computer product: MB-750I-72P9 vendor: nVidia version: 1.0 serial: To Be Filled By O.E.M. width: 32 bits capabilities: smbios-2.5 dmi-2.5 smp-1.4 smp configuration: boot=normal chassis=desktop cpus=2 *-core description: Motherboard product: MB-750I-72P9 physical id: 0 version: 1.0 serial: To be filled by O.E.M. slot: To Be Filled By O.E.M. *-firmware description: BIOS vendor: American Megatrends Inc. physical id: 0 version: V1.1B2 (10/17/2008) size: 64KiB capacity: 960KiB capabilities: isa pci pnp apm upgrade shadowing escd cdboot bootselect socketedrom edd int13floppy1200 int13floppy720 int13floppy2880 int5printscreen int9keyboard int14serial int17printer int10video acpi usb ls120boot zipboot biosbootspecification *-cpu:0 description: CPU product: Intel(R) Pentium(R) D CPU 3.73GHz vendor: Intel Corp. physical id: 4 bus info: cpu@0 version: 15.6.4 serial: 0000-0F64-0000-0000-0000-0000 slot: CPU 1 size: 4266MHz width: 64 bits clock: 267MHz capabilities: boot fpu fpu_exception wp vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe x86-64 constant_tsc pebs bts pni dtes64 monitor ds_cpl vmx cid cx16 xtpr pdcm lahf_lm tpr_shadow configuration: id=0 *-cache:0 description: L1 cache physical id: 5 slot: L1-Cache size: 32KiB capacity: 32KiB capabilities: internal write-back data *-cache:1 description: L2 cache physical id: 6 slot: L2-Cache size: 4MiB capacity: 4MiB capabilities: internal write-back unified *-cache:2 DISABLED description: L3 cache physical id: 7 slot: L3-Cache capabilities: internal *-logicalcpu:0 description: Logical CPU physical id: 0.1 width: 64 bits capabilities: logical *-logicalcpu:1 description: Logical CPU physical id: 0.2 width: 64 bits capabilities: logical *-logicalcpu:2 description: Logical CPU physical id: 0.3 width: 64 bits capabilities: logical *-logicalcpu:3 description: Logical CPU physical id: 0.4 width: 64 bits capabilities: logical *-memory description: System Memory physical id: 25 slot: System board or motherboard size: 2GiB *-bank:0 description: DIMM SDRAM Synchronous product: PartNum0 vendor: Manufacturer0 physical id: 0 serial: SerNum0 slot: DIMM0 size: 512MiB width: 64 bits *-bank:1 description: DIMM SDRAM Synchronous product: PartNum1 vendor: Manufacturer1 physical id: 1 serial: SerNum1 slot: DIMM1 size: 512MiB width: 64 bits *-bank:2 description: DIMM SDRAM Synchronous product: PartNum2 vendor: Manufacturer2 physical id: 2 serial: SerNum2 slot: DIMM2 size: 512MiB width: 64 bits *-bank:3 description: DIMM SDRAM Synchronous product: PartNum3 vendor: Manufacturer3 physical id: 3 serial: SerNum3 slot: DIMM3 size: 512MiB width: 64 bits *-cpu:1 physical id: 1 bus info: cpu@1 version: 15.6.4 serial: 0000-0F64-0000-0000-0000-0000 size: 5032KHz capabilities: vmx ht configuration: id=0 *-logicalcpu:0 description: Logical CPU physical id: 0.1 capabilities: logical *-logicalcpu:1 description: Logical CPU physical id: 0.2 capabilities: logical *-logicalcpu:2 description: Logical CPU physical id: 0.3 capabilities: logical *-logicalcpu:3 description: Logical CPU physical id: 0.4 capabilities: logical *-pci description: Host bridge product: C55 Host Bridge vendor: nVidia Corporation physical id: 100 bus info: pci@0000:00:00.0 version: a2 width: 32 bits clock: 66MHz *-memory:0 UNCLAIMED description: RAM memory product: C55 Memory Controller vendor: nVidia Corporation physical id: 0.1 bus info: pci@0000:00:00.1 version: a1 width: 32 bits clock: 66MHz (15.2ns) configuration: latency=0 *-memory:1 UNCLAIMED description: RAM memory product: C55 Memory Controller vendor: nVidia Corporation physical id: 0.2 bus info: pci@0000:00:00.2 version: a1 width: 32 bits clock: 66MHz (15.2ns) configuration: latency=0 *-memory:2 UNCLAIMED description: RAM memory product: C55 Memory Controller vendor: nVidia Corporation physical id: 0.3 bus info: pci@0000:00:00.3 version: a1 width: 32 bits clock: 66MHz (15.2ns) capabilities: bus_master configuration: latency=0 *-memory:3 UNCLAIMED description: RAM memory product: C55 Memory Controller vendor: nVidia Corporation physical id: 0.4 bus info: pci@0000:00:00.4 version: a1 width: 32 bits clock: 66MHz (15.2ns) capabilities: bus_master configuration: latency=0 *-memory:4 UNCLAIMED description: RAM memory product: C55 Memory Controller vendor: nVidia Corporation physical id: 0.5 bus info: pci@0000:00:00.5 version: a2 width: 32 bits clock: 66MHz (15.2ns) capabilities: bus_master configuration: latency=0 *-memory:5 UNCLAIMED description: RAM memory product: C55 Memory Controller vendor: nVidia Corporation physical id: 0.6 bus info: pci@0000:00:00.6 version: a1 width: 32 bits clock: 66MHz (15.2ns) configuration: latency=0 *-memory:6 UNCLAIMED description: RAM memory product: C55 Memory Controller vendor: nVidia Corporation physical id: 0.7 bus info: pci@0000:00:00.7 version: a1 width: 32 bits clock: 66MHz (15.2ns) configuration: latency=0 *-memory:7 UNCLAIMED description: RAM memory product: C55 Memory Controller vendor: nVidia Corporation physical id: 1 bus info: pci@0000:00:01.0 version: a1 width: 32 bits clock: 66MHz (15.2ns) configuration: latency=0 *-memory:8 UNCLAIMED description: RAM memory product: C55 Memory Controller vendor: nVidia Corporation physical id: 1.1 bus info: pci@0000:00:01.1 version: a1 width: 32 bits clock: 66MHz (15.2ns) configuration: latency=0 *-memory:9 UNCLAIMED description: RAM memory product: C55 Memory Controller vendor: nVidia Corporation physical id: 1.2 bus info: pci@0000:00:01.2 version: a1 width: 32 bits clock: 66MHz (15.2ns) configuration: latency=0 *-memory:10 UNCLAIMED description: RAM memory product: C55 Memory Controller vendor: nVidia Corporation physical id: 1.3 bus info: pci@0000:00:01.3 version: a1 width: 32 bits clock: 66MHz (15.2ns) configuration: latency=0 *-memory:11 UNCLAIMED description: RAM memory product: C55 Memory Controller vendor: nVidia Corporation physical id: 1.4 bus info: pci@0000:00:01.4 version: a1 width: 32 bits clock: 66MHz (15.2ns) configuration: latency=0 *-memory:12 UNCLAIMED description: RAM memory product: C55 Memory Controller vendor: nVidia Corporation physical id: 1.5 bus info: pci@0000:00:01.5 version: a1 width: 32 bits clock: 66MHz (15.2ns) configuration: latency=0 *-memory:13 UNCLAIMED description: RAM memory product: C55 Memory Controller vendor: nVidia Corporation physical id: 1.6 bus info: pci@0000:00:01.6 version: a1 width: 32 bits clock: 66MHz (15.2ns) configuration: latency=0 *-memory:14 UNCLAIMED description: RAM memory product: C55 Memory Controller vendor: nVidia Corporation physical id: 2 bus info: pci@0000:00:02.0 version: a1 width: 32 bits clock: 66MHz (15.2ns) configuration: latency=0 *-memory:15 UNCLAIMED description: RAM memory product: C55 Memory Controller vendor: nVidia Corporation physical id: 2.1 bus info: pci@0000:00:02.1 version: a1 width: 32 bits clock: 66MHz (15.2ns) capabilities: bus_master configuration: latency=0 *-memory:16 UNCLAIMED description: RAM memory product: C55 Memory Controller vendor: nVidia Corporation physical id: 2.2 bus info: pci@0000:00:02.2 version: a1 width: 32 bits clock: 66MHz (15.2ns) configuration: latency=0 *-pci:0 description: PCI bridge product: C55 PCI Express bridge vendor: nVidia Corporation physical id: 3 bus info: pci@0000:00:03.0 version: a1 width: 32 bits clock: 33MHz capabilities: pci pm msi ht pciexpress bus_master cap_list configuration: driver=pcieport-driver *-pci description: PCI bridge product: nVidia Corporation vendor: nVidia Corporation physical id: 0 bus info: pci@0000:01:00.0 version: a2 width: 32 bits clock: 33MHz capabilities: pci pm pciexpress bus_master cap_list configuration: driver=pcieport-driver *-pci:0 description: PCI bridge product: nVidia Corporation vendor: nVidia Corporation physical id: 0 bus info: pci@0000:02:00.0 version: a2 width: 32 bits clock: 33MHz capabilities: pci pm pciexpress bus_master cap_list configuration: driver=pcieport-driver *-display description: VGA compatible controller product: GeForce 8600 GT vendor: nVidia Corporation physical id: 0 bus info: pci@0000:03:00.0 version: a1 width: 64 bits clock: 33MHz capabilities: pm msi pciexpress bus_master cap_list configuration: driver=nvidia latency=0 module=nvidia *-pci:1 description: PCI bridge product: nVidia Corporation vendor: nVidia Corporation physical id: 2 bus info: pci@0000:02:02.0 version: a2 width: 32 bits clock: 33MHz capabilities: pci pm pciexpress bus_master cap_list configuration: driver=pcieport-driver *-display description: VGA compatible controller product: GeForce 8600 GT vendor: nVidia Corporation physical id: 0 bus info: pci@0000:04:00.0 version: a1 width: 64 bits clock: 33MHz capabilities: pm msi pciexpress bus_master cap_list configuration: driver=nvidia latency=0 module=nvidia *-pci:2 description: PCI bridge product: nVidia Corporation vendor: nVidia Corporation physical id: 3 bus info: pci@0000:02:03.0 version: a2 width: 32 bits clock: 33MHz capabilities: pci pm pciexpress bus_master cap_list configuration: driver=pcieport-driver *-pci:1 description: PCI bridge product: C55 PCI Express bridge vendor: nVidia Corporation physical id: 6 bus info: pci@0000:00:06.0 version: a1 width: 32 bits clock: 33MHz capabilities: pci pm msi ht pciexpress bus_master cap_list configuration: driver=pcieport-driver *-storage description: SATA controller product: JMicron 20360/20363 AHCI Controller vendor: JMicron Technologies, Inc. physical id: 0 bus info: pci@0000:06:00.0 version: 03 width: 32 bits clock: 33MHz capabilities: storage pm pciexpress bus_master cap_list configuration: driver=ahci latency=0 module=ahci *-ide description: IDE interface product: JMicron 20360/20363 AHCI Controller vendor: JMicron Technologies, Inc. physical id: 0.1 bus info: pci@0000:06:00.1 version: 03 width: 32 bits clock: 33MHz capabilities: ide pm bus_master cap_list configuration: driver=pata_jmicron latency=0 *-pci:2 description: PCI bridge product: C55 PCI Express bridge vendor: nVidia Corporation physical id: 7 bus info: pci@0000:00:07.0 version: a1 width: 32 bits clock: 33MHz capabilities: pci pm msi ht pciexpress bus_master cap_list configuration: driver=pcieport-driver *-memory:17 UNCLAIMED description: RAM memory product: MCP51 Host Bridge vendor: nVidia Corporation physical id: 9 bus info: pci@0000:00:09.0 version: a2 width: 32 bits clock: 66MHz (15.2ns) capabilities: ht bus_master cap_list configuration: latency=0 *-isa description: ISA bridge product: MCP51 LPC Bridge vendor: nVidia Corporation physical id: a bus info: pci@0000:00:0a.0 version: a3 width: 32 bits clock: 66MHz capabilities: isa bus_master configuration: latency=0 *-serial description: SMBus product: MCP51 SMBus vendor: nVidia Corporation physical id: a.1 bus info: pci@0000:00:0a.1 version: a3 width: 32 bits clock: 66MHz capabilities: pm cap_list configuration: driver=nForce2_smbus latency=0 module=i2c_nforce2 *-memory:18 UNCLAIMED description: RAM memory product: MCP51 Memory Controller 0 vendor: nVidia Corporation physical id: a.2 bus info: pci@0000:00:0a.2 version: a3 width: 32 bits clock: 66MHz (15.2ns) configuration: latency=0 *-usb:0 description: USB Controller product: MCP51 USB Controller vendor: nVidia Corporation physical id: b bus info: pci@0000:00:0b.0 version: a3 width: 32 bits clock: 66MHz capabilities: pm bus_master cap_list configuration: driver=ohci_hcd latency=0 maxlatency=1 mingnt=3 *-usb:1 description: USB Controller product: MCP51 USB Controller vendor: nVidia Corporation physical id: b.1 bus info: pci@0000:00:0b.1 version: a3 width: 32 bits clock: 66MHz capabilities: debug pm bus_master cap_list configuration: driver=ehci_hcd latency=0 maxlatency=1 mingnt=3 module=ehci_hcd *-ide:0 description: IDE interface product: MCP51 IDE vendor: nVidia Corporation physical id: d bus info: pci@0000:00:0d.0 version: a1 width: 32 bits clock: 66MHz capabilities: ide pm bus_master cap_list configuration: driver=pata_amd latency=0 maxlatency=1 mingnt=3 *-ide:1 description: IDE interface product: MCP51 Serial ATA Controller vendor: nVidia Corporation physical id: e bus info: pci@0000:00:0e.0 logical name: scsi3 version: a1 width: 32 bits clock: 66MHz capabilities: ide pm msi ht bus_master cap_list emulated configuration: driver=sata_nv latency=0 maxlatency=1 mingnt=3 module=sata_nv *-disk description: ATA Disk product: ST3320620AS vendor: Seagate physical id: 0.0.0 bus info: scsi@3:0.0.0 logical name: /dev/sda version: 3.AA serial: 9QF4VHCZ size: 298GiB (320GB) capabilities: partitioned partitioned:dos configuration: ansiversion=5 signature=b9d96fab *-volume:0 description: EXT4 volume vendor: Linux physical id: 1 bus info: scsi@3:0.0.0,1 logical name: /dev/sda1 logical name: / version: 1.0 serial: 7b4e3b99-b9ad-46ee-9ca4-41aa56bbccee size: 111GiB capacity: 111GiB capabilities: primary bootable journaled extended_attributes large_files huge_files dir_nlink extents ext4 ext2 initialized configuration: created=2009-10-01 20:51:25 filesystem=ext4 modified=2009-10-03 10:31:37 mount.fstype=ext4 mount.options=rw,relatime,errors=remount-ro,barrier=1,data=ordered mounted=2009-10-03 10:29:09 state=mounted *-volume:1 description: Extended partition physical id: 2 bus info: scsi@3:0.0.0,2 logical name: /dev/sda2 size: 186GiB capacity: 186GiB capabilities: primary extended partitioned partitioned:extended *-logicalvolume:0 description: Linux swap / Solaris partition physical id: 5 logical name: /dev/sda5 capacity: 12GiB capabilities: nofs *-logicalvolume:1 description: Linux filesystem partition physical id: 6 logical name: /dev/sda6 logical name: /home capacity: 174GiB configuration: mount.fstype=ext4 mount.options=rw,relatime,barrier=1,data=ordered state=mounted *-ide:2 description: IDE interface product: MCP51 Serial ATA Controller vendor: nVidia Corporation physical id: f bus info: pci@0000:00:0f.0 logical name: scsi5 version: a1 width: 32 bits clock: 66MHz capabilities: ide pm msi ht bus_master cap_list emulated configuration: driver=sata_nv latency=0 maxlatency=1 mingnt=3 module=sata_nv *-cdrom description: DVD-RAM writer product: CDDVDW SH-S223Q vendor: TSSTcorp physical id: 0.0.0 bus info: scsi@5:0.0.0 logical name: /dev/cdrom logical name: /dev/cdrw logical name: /dev/dvd logical name: /dev/dvdrw logical name: /dev/scd0 logical name: /dev/sr0 version: SB03 capabilities: removable audio cd-r cd-rw dvd dvd-r dvd-ram configuration: ansiversion=5 status=nodisc *-pci:3 description: PCI bridge product: MCP51 PCI Bridge vendor: nVidia Corporation physical id: 10 bus info: pci@0000:00:10.0 version: a2 width: 32 bits clock: 66MHz capabilities: pci ht bus_master cap_list *-multimedia description: Multimedia audio controller product: SB Live! EMU10k1 vendor: Creative Labs physical id: 7 bus info: pci@0000:08:07.0 version: 0a width: 32 bits clock: 33MHz capabilities: pm bus_master cap_list configuration: driver=EMU10K1_Audigy latency=64 maxlatency=20 mingnt=2 module=snd_emu10k1 *-input description: Input device controller product: SB Live! Game Port vendor: Creative Labs physical id: 7.1 bus info: pci@0000:08:07.1 version: 0a width: 32 bits clock: 33MHz capabilities: pm bus_master cap_list configuration: driver=Emu10k1_gameport latency=64 module=emu10k1_gp *-firewire description: FireWire (IEEE 1394) product: VT6306 Fire II IEEE 1394 OHCI Link Layer Controller vendor: VIA Technologies, Inc. physical id: 9 bus info: pci@0000:08:09.0 version: c0 width: 32 bits clock: 33MHz capabilities: pm bus_master cap_list configuration: driver=ohci1394 latency=64 maxlatency=32 module=ohci1394 *-bridge description: Ethernet interface product: MCP51 Ethernet Controller vendor: nVidia Corporation physical id: 14 bus info: pci@0000:00:14.0 logical name: eth0 version: a3 serial: 00:24:21:19:39:68 size: 100000000 capacity: 1000000000 width: 32 bits clock: 66MHz capabilities: bridge pm bus_master cap_list ethernet physical mii 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation configuration: autonegotiation=on broadcast=yes driver=forcedeth driverversion=0.61 duplex=full ip=192.168.0.77 latency=0 link=yes maxlatency=20 mingnt=1 module=forcedeth multicast=yes port=MII speed=100MB/s *-network DISABLED description: Ethernet interface physical id: 1 logical name: pan0 serial: f2:16:00:93:99:9a capabilities: ethernet physical configuration: broadcast=yes driver=bridge driverversion=2.3 firmware=N/A link=yes multicast=yes