I've been following this bug since hardy. Nowadays is only annoying sin I can boot after waiting for an extra 30 seconds or more without problem. In the past I upgraded BIOS, firmwares, etc but problem remains. My config is: Seagate Barracuda at SATA port. Western Digital Caviar at IDE port (master). DVD-ROM at second IDE port (master). DVD-ROM writer at second IDE port (slave) The problem is shown when detecting legacy IDE units. [ 1.207345] input: AT Translated Set 2 keyboard as /devices/platform/i8042/serio0/input/input3 [ 1.242560] ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 300) [ 1.301915] ata1.00: ATA-7: ST3400833AS, 3.AAE, max UDMA/133 [ 1.301982] ata1.00: 781422768 sectors, multi 16: LBA48 NCQ (depth 31/32) [ 1.393552] ata1.00: configured for UDMA/133 [ 1.393719] scsi 0:0:0:0: Direct-Access ATA ST3400833AS 3.AA PQ: 0 ANSI: 5 [ 1.393914] sd 0:0:0:0: Attached scsi generic sg0 type 0 [ 1.394019] sd 0:0:0:0: [sda] 781422768 512-byte logical blocks: (400 GB/372 GiB) [ 1.394141] sd 0:0:0:0: [sda] Write Protect is off [ 1.394208] sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00 [ 1.394231] sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA [ 1.394439] sda: [ 1.405403] ata2: SATA link down (SStatus 0 SControl 300) [ 1.416363] ata4: SATA link down (SStatus 0 SControl 300) [ 1.433212] sda1 sda2 sda3 sda4 [ 1.451029] sd 0:0:0:0: [sda] Attached SCSI disk [ 1.560037] usb 1-7: new high speed USB device using ehci_hcd and address 3 [ 1.715423] usb 1-7: configuration #1 chosen from 1 choice [ 2.052521] usb 2-1: new full speed USB device using ohci_hcd and address 2 [ 2.276096] usb 2-1: configuration #1 chosen from 1 choice [ 2.279073] hub 2-1:1.0: USB hub found [ 2.282049] hub 2-1:1.0: 2 ports detected [ 2.574049] usb 2-1.1: new full speed USB device using ohci_hcd and address 3 [ 2.699090] usb 2-1.1: configuration #1 chosen from 1 choice [ 2.791056] usb 2-1.2: new full speed USB device using ohci_hcd and address 4 [ 2.920100] usb 2-1.2: configuration #1 chosen from 1 choice [ 6.300027] ata5: link is slow to respond, please be patient (ready=0) [ 11.160027] ata5: SRST failed (errno=-16) [ 16.360026] ata5: link is slow to respond, please be patient (ready=0) [ 21.220027] ata5: SRST failed (errno=-16) [ 26.420027] ata5: link is slow to respond, please be patient (ready=0) [ 52.220071] ata5.01: link status unknown, clearing UNKNOWN to NONE [ 52.241764] ata5.00: ATA-6: WDC WD2000JB-00GVA0, 08.02D08, max UDMA/100 [ 52.241833] ata5.00: 390721968 sectors, multi 16: LBA48 [ 52.241921] ata5: nv_mode_filter: 0x3f39f&0x3f39f->0x3f39f, BIOS=0x3f000 (0xc600c0c0) ACPI=0x3f01f (20:900:0x11) [ 52.281697] ata5.00: configured for UDMA/100 [ 52.281840] scsi 4:0:0:0: Direct-Access ATA WDC WD2000JB-00G 08.0 PQ: 0 ANSI: 5 [ 52.282029] sd 4:0:0:0: Attached scsi generic sg1 type 0 [ 52.282128] sd 4:0:0:0: [sdb] 390721968 512-byte logical blocks: (200 GB/186 GiB) [ 52.282249] sd 4:0:0:0: [sdb] Write Protect is off [ 52.282314] sd 4:0:0:0: [sdb] Mode Sense: 00 3a 00 00 [ 52.282337] sd 4:0:0:0: [sdb] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA [ 52.282549] sdb: sdb2 < sdb5 > [ 52.315275] sd 4:0:0:0: [sdb] Attached SCSI disk [ 52.480475] ata6.00: ATAPI: TOSHIBA DVD-ROM SD-M1402, 1010, max UDMA/33 [ 52.480572] ata6.01: ATAPI: ATAPI DVD DUAL 8X4X12, B3LC, max UDMA/33 [ 52.480661] ata6: nv_mode_filter: 0x739f&0x739f->0x739f, BIOS=0x7000 (0xc600c0c0) ACPI=0x701f (60:60:0x15) [ 52.480666] ata6: nv_mode_filter: 0x739f&0x739f->0x739f, BIOS=0x7000 (0xc600c0c0) ACPI=0x701f (60:60:0x15) [ 52.520426] ata6.00: configured for UDMA/33 [ 52.560690] ata6.01: configured for UDMA/33 [ 52.565315] scsi 5:0:0:0: CD-ROM TOSHIBA DVD-ROM SD-M1402 1010 PQ: 0 ANSI: 5 [ 52.572871] sr0: scsi3-mmc drive: 40x/40x cd/rw xa/form2 cdda tray [ 52.572939] Uniform CD-ROM driver Revision: 3.20 [ 52.573072] sr 5:0:0:0: Attached scsi CD-ROM sr0 [ 52.573118] sr 5:0:0:0: Attached scsi generic sg2 type 5 [ 52.575056] scsi 5:0:1:0: CD-ROM ATAPI DVD DUAL 8X4X12 B3LC PQ: 0 ANSI: 5 My hardware: *-ide:0 description: IDE interface product: MCP51 IDE vendor: nVidia Corporation physical id: d bus info: pci@0000:00:0d.0 logical name: scsi4 logical name: scsi5 version: a1 width: 32 bits clock: 66MHz capabilities: ide pm bus_master cap_list emulated configuration: driver=pata_amd latency=0 maxlatency=1 mingnt=3 resources: irq:0 ioport:1f0(size=8) ioport:3f6 ioport:170(size=8) ioport:376 ioport:ffa0(size=16) *-disk description: ATA Disk product: WDC WD2000JB-00G vendor: Western Digital physical id: 0 bus info: scsi@4:0.0.0 logical name: /dev/sdb version: 08.0 serial: WD-WMAL81192472 size: 186GiB (200GB) capabilities: partitioned partitioned:dos configuration: ansiversion=5 signature=b766b766 *-volume