[Bug 412527] Re: Cannot mount media in DVD rom drive, Acer Timeline 4810T. Drive is detected, and media only detected if placed in the drive when machine suspended. Even then DVD movies (purchased) are not recognised - error message that media is unknown. Audio cd's sometimes play. When trying to unmount, I am asked for my password - message given that another user mounted the media.

[AmenophisIII]

changing sata mode from ahci to ide worked on a timeline 4810t.

dmesg with ahci:
[    6.750111] ata5: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
[    6.769801] ata5.00: ACPI cmd 00/00:00:00:00:00:a0 rejected by device (Stat=0x51 Err=0x04)
[    6.771547] ata5.00: ATAPI: TSSTcorp CDDVDW TS-U633A, AC01, max UDMA/100, ATAPI AN
[    6.771563] ata5.00: applying bridge limits
[    6.793370] ata5.00: ACPI cmd 00/00:00:00:00:00:a0 rejected by device (Stat=0x51 Err=0x04)
[    6.795130] ata5.00: configured for UDMA/100
[    6.813989] scsi 4:0:0:0: CD-ROM            TSSTcorp CDDVDW TS-U633A  AC01 PQ: 0 ANSI: 5
[    6.827090] sr0: scsi3-mmc drive: 24x/24x writer dvd-ram cd/rw xa/form2 cdda tray
[    6.827095] Uniform CD-ROM driver Revision: 3.20
[    6.827200] sr 4:0:0:0: Attached scsi CD-ROM sr0
[    6.827258] sr 4:0:0:0: Attached scsi generic sg1 type 5

dmesg with ide:
[    5.711551] ata3.00: ATAPI: TSSTcorp CDDVDW TS-U633A, AC01, max UDMA/100
[    5.711563] ata3.00: applying bridge limits
[    5.750341] ata3.00: configured for UDMA/100
[    5.755813] scsi 2:0:0:0: CD-ROM            TSSTcorp CDDVDW TS-U633A  AC01 PQ: 0 ANSI: 5
[    5.762898] sr0: scsi3-mmc drive: 62x/62x writer dvd-ram cd/rw xa/form2 cdda tray
[    5.762903] Uniform CD-ROM driver Revision: 3.20
[    5.763017] sr 2:0:0:0: Attached scsi CD-ROM sr0
[    5.763065] sr 2:0:0:0: Attached scsi generic sg1 type 5

no idea why there are acpi errors in between.

there may be a valid firmware update for this drive here: http://www.samsungodd.com/kor/Firmware/FWDownload/FWDownload.asp?FunctionValue=view&no=699&SearchWord=TS-U633A&SearchMode=TOTALSEARCH&PageNumber=1&product_code=
the site is not available in english.
for us linux users the included windows flasher is of no use, but there is a dos version available here http://www.samsungodd.com/Lib/File/sfdndos.exe
the application has a hardware check built in, but...
I DO NOT RECOMMEND THAT YOU TRY THIS THOUGH
i did not either yet.

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Cannot mount media in DVD rom drive, Acer Timeline 4810T. Drive is detected, and media only detected if placed in the drive when machine suspended. Even then DVD movies (purchased) are not recognised - error message that media is unknown. Audio cd's sometimes play. When trying to unmount, I am asked for my password - message given that another user mounted the media. 
https://bugs.launchpad.net/bugs/412527
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