I don't think this is fixed, but if I am mistaken, please let me know and I will open a new bug. I'm running 9.10 Karmic, up-to-date, and I am having what seems to be the same problem with a LiteOn iHOS104-08 SATA BD-ROM drive. Here is the relevant part of my dmesg: [ 1.180349] ata5.00: ATAPI: ATAPI iHOS104, WL0B, max UDMA/100 [ 1.220179] ata5.00: configured for UDMA/100 [ 6.220071] ata5.00: qc timeout (cmd 0xa0) [ 6.220076] ata5.00: TEST_UNIT_READY failed (err_mask=0x4) [ 6.380063] ata5: SATA link up 1.5 Gbps (SStatus 113 SControl 300) [ 6.440174] ata5.00: configured for UDMA/100 [ 11.440069] ata5.00: qc timeout (cmd 0xa0) [ 11.440074] ata5.00: TEST_UNIT_READY failed (err_mask=0x4) [ 11.440077] ata5: limiting SATA link speed to 1.5 Gbps [ 11.440081] ata5.00: limiting speed to UDMA/100:PIO3 [ 11.600080] ata5: SATA link up 1.5 Gbps (SStatus 113 SControl 300) [ 11.660174] ata5.00: configured for UDMA/100 [ 16.660049] ata5.00: qc timeout (cmd 0xa0) [ 16.660054] ata5.00: TEST_UNIT_READY failed (err_mask=0x4) [ 16.660056] ata5.00: disabled [ 16.660069] ata5: hard resetting link [ 16.660071] ata5: nv: skipping hardreset on occupied port [ 16.820063] ata5: SATA link up 1.5 Gbps (SStatus 113 SControl 300) [ 16.820071] ata5: EH complete [ 16.980063] ata6: SATA link up 1.5 Gbps (SStatus 113 SControl 300) [ 17.000164] ata6.00: ATAPI: TSSTcorpCD/DVDW SH-S183L, SB01, max UDMA/33 [ 17.000175] ata6.00: applying bridge limits [ 17.040178] ata6.00: configured for UDMA/33 [ 17.041472] scsi 5:0:0:0: CD-ROM TSSTcorp CD/DVDW SH-S183L SB01 PQ: 0 ANSI: 5 [ 17.048623] sr0: scsi3-mmc drive: 48x/48x writer dvd-ram cd/rw xa/form2 cdda tray [ 17.048627] Uniform CD-ROM driver Revision: 3.20 [ 17.048713] sr 5:0:0:0: Attached scsi CD-ROM sr0 [ 17.048760] sr 5:0:0:0: Attached scsi generic sg1 type 5 As you can see, the drive on "ata5" fails (that's the Blu-Ray), but the SATA DVD burner on "ata6" is detected properly and works as expected. However, the BIOS detects the drive and I can even partially boot a live CD from the Blu-Ray (I get the language selection and I can choose to boot the live disk, but it dies during boot because it can no longer find the drive). Also, note that where is says "err_mask=0x4" I have also seen "err_mask=0x5". The motherboard is an EVGA 680i SLI (at current BIOS - P33). From the dmesg output (a little earlier than the snippet above), I believe the driver in use is "sata_nv". I have tried many things to work around this issue: 1) Moved the Blu-Ray to different SATA ports, including the known good ones where my hard disk and DVD burner are connected. 2) Booted with "noapic", "acpi=off", "irqpoll", and "hpet=disable" 3) Disabled HPET and APIC (separately and together) in the BIOS 4) Booted from a 9.04, 9.10, and current daily build of 10.04 live CD (all with the same result) I am currently downloading the live CD for Fedora 12 to see if that shows any different result. I will report back when I know either way. Also, if it helps, it looks like someone else reported the same problem with the same drive in the forums back in July. http://ubuntuforums.org/showthread.php?p=8436218 uname -a Linux zeus 2.6.31-16-generic #52-Ubuntu SMP Thu Dec 3 22:07:16 UTC 2009 x86_64 GNU/Linux I will attach my full dmesg, lshw, and lspci -vvnn (as I have seen others post). If there is anything else I can provide that would help, please let me know. I am very anxious to get this drive working.