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**dibl** · Aug 28, 2009, 06:31 AM

Re: CD/DVD Drive either not mounting or just not seen on Acer 4810t

Once in awhile this problem appears, for someone -- unfortunately it does not always seem to have a solution.

First, there should never be a requirement to manually mount an optical drive on a modern Linux OS. If it won't "just work", then there's an issue with the hardware itself or the hardware driver, most likely, and manual mounting won't help.

Troubleshooting -- first step -- BIOS check. What is the interface to your optical drive, and what channel do you have it on? Are there "options" on the interface (IDE or SATA, as applicable), like "legacy mode" or "AHCI"? A little fiddling with these settings might make it visible to the OS. Also, if you can boot a Live CD and run it, that will give you the warm fuzzy feeling that an internal cable connector hasn't come loose or something silly like that.

Second, in the Konsole run dmesg and look at the boot sequence events. On my rig, if I scroll through the dmesg output, I find a section where the messages begin "ATA" and there I find this:

[ 0.501757] ata5.01: ATAPI: ASUS DRW-1608P3S, 1.24, max UDMA/66
[ 0.517779] ata5.01: configured for UDMA/66
[ 0.658392] ata4: SATA link up 1.5 Gbps (SStatus 113 SControl 300)

then I see my my 3 SATA hard drives were found and then immediately following that section I find this:

[ 1.430766] sd 2:0:0:0: [sdb] Attached SCSI disk
[ 1.432092] scsi 4:0:1:0: CD-ROM ASUS DRW-1608P3S 1.24 PQ: 0 ANSI: 5
[ 1.433781] sdc1 sdc2 sdc3
[ 1.438567] sd 3:0:0:0: [sdc] Attached SCSI disk
[ 1.450397] sr0: scsi3-mmc drive: 40x/40x writer dvd-ram cd/rw xa/form2 cdda tray
[ 1.450401] Uniform CD-ROM driver Revision: 3.20
[ 1.450579] sr 4:0:1:0: Attached scsi CD-ROM sr0
[ 1.450676] sr 4:0:1:0: Attached scsi generic sg3 type 5

Showing that the OS found the optical drive during the boot process. It has to be "seen" before it can ever be mounted.

Finally, *buntu automatically writes the /etc/fstab file during installation, and (if installed from a CD ROM) the mounting instruction is found at the end of the file, looking very much like this:

/dev/scd0 /media/cdrom0 udf,iso9660 user,noauto,exec,utf8 0 0

Here are some other pages that may offer some help:

https://bugs.launchpad.net/ubuntu/+s...rub/+bug/55955

http://www.pcmech.com/article/ubuntu...compatibility/

http://www.faqs.org/docs/Linux-HOWTO...O.html#AEN1008

**jim.hitch** · Aug 30, 2009, 12:22 AM

Re: CD/DVD Drive either not mounting or just not seen on Acer 4810t

What was annoying me was that I had installed the distro using the drive in the first place.

I've now discovered that the drive is recognised if I put a disk in at start up (obviously doesn't help if it's bootable, and I don't want it to boot from that!). I can then mount it. But if I take the disk out, it won't recognise any further use of the drive.

Anyway, I'll have a look at your suggestions and get back to you.

Another thing to point out is that in Vista, the drive has some sort of energy saving mode, maybe this is helping cause the issue.

**jim.hitch** · Aug 30, 2009, 02:31 AM

Re: CD/DVD Drive either not mounting or just not seen on Acer 4810t

Ok.

This is what dmesg gives me, whether I have anything in the drive to begin with or not:

Code:

[  35.322223] ata2: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[  35.322980] ata2.00: ACPI cmd 00/00:00:00:00:00:b0 rejected by device (Stat=0x51 Err=0x04)
[  35.330950] ata2.00: ATA-8: WDC WD3200BEVT-22ZCT0, 11.01A11, max UDMA/133
[  35.330954] ata2.00: 625142448 sectors, multi 16: LBA48 NCQ (depth 31/32)
[  35.331743] ata2.00: ACPI cmd 00/00:00:00:00:00:b0 rejected by device (Stat=0x51 Err=0x04)
[  35.331921] ata2.00: configured for UDMA/133
[  35.382891] ata5: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
[  35.394011] ata5.00: ACPI cmd 00/00:00:00:00:00:a0 rejected by device (Stat=0x51 Err=0x04)
[  35.394127] ata5.00: ATAPI: HL-DT-ST DVDRAM GU10N, AP03, max UDMA/133, ATAPI AN
[  35.404597] ata5.00: ACPI cmd 00/00:00:00:00:00:a0 rejected by device (Stat=0x51 Err=0x04)
[  35.404821] ata5.00: configured for UDMA/133

[  35.458678] sd 1:0:0:0: [sda] Attached SCSI disk
[  35.462950] sd 1:0:0:0: Attached scsi generic sg0 type 0
[  35.462971] sr 4:0:0:0: Attached scsi generic sg1 type 5
[  35.476541] sr0: scsi3-mmc drive: 24x/24x writer dvd-ram cd/rw xa/form2 cdda tray
[  35.476545] Uniform CD-ROM driver Revision: 3.20
[  35.476595] sr 4:0:0:0: Attached scsi CD-ROM sr0

Using the http://www.faqs.org/docs/Linux-HOWTO...O.html#AEN1008 link you sent me I have discovered the following

Code:

~$ uname -a
Linux 4810t-804-MAIN 2.6.24-24-generic #1 SMP Tue Aug 18 17:04:53 UTC 2009 i686 GNU/Linux

No problems there.

However

Code:

~$ cat /proc/devices
Character devices:
 1 mem
 2 pty
 3 ttyp
 4 /dev/vc/0
 4 tty
 4 ttyS
 5 /dev/tty
 5 /dev/console
 5 /dev/ptmx
 6 lp
 7 vcs
 10 misc
 13 input
 14 sound
 21 sg
 29 fb
 81 video4linux
 99 ppdev
116 alsa
128 ptm
136 pts
180 usb
189 usb_device
216 rfcomm
226 drm
253 hidraw
254 usb_endpoint

Block devices:
 1 ramdisk
 8 sd
 11 sr
 65 sd
 66 sd
 67 sd
 68 sd
 69 sd
 70 sd
 71 sd
128 sd
129 sd
130 sd
131 sd
132 sd
133 sd
134 sd
135 sd
254 device-mapper

So so mention of the drive there.

And

Code:

~$ cat /proc/filesystems
nodev  sysfs
nodev  rootfs
nodev  bdev
nodev  proc
nodev  cgroup
nodev  cpuset
nodev  debugfs
nodev  securityfs
nodev  sockfs
nodev  pipefs
nodev  anon_inodefs
nodev  futexfs
nodev  tmpfs
nodev  inotifyfs
nodev  devpts
    cramfs
nodev  ramfs
nodev  mqueue
nodev  fuse
    fuseblk
nodev  fusectl
nodev  usbfs
    ext3
nodev  binfmt_misc

No mention of iso9660

And finally

Code:

~$ cat /proc/ioports
0000-001f : dma1
0020-0021 : pic1
0040-0043 : timer0
0050-0053 : timer1
0060-006f : keyboard
0070-0077 : rtc
0080-008f : dma page reg
00a0-00a1 : pic2
00c0-00df : dma2
00f0-00ff : fpu
03c0-03df : vga+
0400-047f : pnp 00:01
 0400-0403 : ACPI PM1a_EVT_BLK
 0404-0405 : ACPI PM1a_CNT_BLK
 0408-040b : ACPI PM_TMR
 0410-0415 : ACPI CPU throttle
 0420-042f : ACPI GPE0_BLK
 0450-0450 : ACPI PM2_CNT_BLK
0500-053f : pnp 00:01
0600-060f : pnp 00:01
0610-0610 : pnp 00:01
0800-080f : pnp 00:01
0810-0817 : pnp 00:01
0820-0823 : pnp 00:01
0cf8-0cff : PCI conf1
164e-164f : pnp 00:01
2000-2fff : PCI Bus #02
3000-3fff : PCI Bus #01
 3000-307f : 0000:01:00.0
  3000-307f : ATL1C
4000-401f : 0000:00:1f.3
4020-403f : 0000:00:1f.2
4040-405f : 0000:00:1d.3
 4040-405f : uhci_hcd
4060-407f : 0000:00:1d.2
 4060-407f : uhci_hcd
4080-409f : 0000:00:1d.1
 4080-409f : uhci_hcd
40a0-40bf : 0000:00:1d.0
 40a0-40bf : uhci_hcd
40c0-40df : 0000:00:1a.1
 40c0-40df : uhci_hcd
40e0-40ff : 0000:00:1a.0
 40e0-40ff : uhci_hcd
4100-4107 : 0000:00:1f.2
4108-410f : 0000:00:1f.2
4110-4117 : 0000:00:02.0
4118-411b : 0000:00:1f.2
411c-411f : 0000:00:1f.2

That means very little to me!

According to the article

If any of the drivers you thought you compiled in are not displayed, then something went wrong with the kernel configuration or build. Start the installation process again, beginning with configuration and building of the kernel.

My build seems otherwise OK, do I really need to reinstall (plus the fact I wouldn't know how to go about it - beyond starting all over again)?

I had a look in Adept and searched 'iso9660', neither libarchive1 or libiso9660-5 are installed

Should I install one of these libs and that would add the iso9660 driver?

Jim

Attached Files

**dibl** · Aug 30, 2009, 05:27 AM

Re: CD/DVD Drive either not mounting or just not seen on Acer 4810t

I checked my installed packages and find the libiso9660-7 (I'm running a newer kernel). I think you need to install that one (the -5 shown on your list).

Another thought -- make sure your user is a member of the "audio" group and also the "fuse" group, and then you'll have to log out and back in to see if makes a difference.

**jim.hitch** · Sep 01, 2009, 03:22 PM

Re: CD/DVD Drive either not mounting or just not seen on Acer 4810t

I think you need to install that one (the -5 shown on your list).

Done

Another thought -- make sure your user is a member of the "audio" group and also the "fuse" group, and then you'll have to log out and back in to see if makes a difference.

Checked. I assume that root doesn't have to be a member?

Having done the above and rebooted, the difference is minimal. To get the machine to recognise the disk I had to boot with it in the drive (as before), though this time I managed to remove it and replace it, and it recognised it again (small victory).

But if I took it out and replaced it with another disk, or put the 1st one back in after trying it with another disk, no joy.

Another thing I've noticed since I first posted it the if I put a disk in and take it out (not recogised) the HDD light remains on, ie. the disk stays in perpetual spin. Not good.

At least iso9660 is now showing up here:

Code:

~$ cat /proc/filesystems
nodev  sysfs
nodev  rootfs
nodev  bdev
nodev  proc
nodev  cgroup
nodev  cpuset
nodev  debugfs
nodev  securityfs
nodev  sockfs
nodev  pipefs
nodev  anon_inodefs
nodev  futexfs
nodev  tmpfs
nodev  inotifyfs
nodev  devpts
    cramfs
nodev  ramfs
nodev  mqueue
nodev  fuse
    fuseblk
nodev  fusectl
nodev  usbfs
    ext3
    iso9660
nodev  binfmt_misc
    vfat

... though still nothing showing under block devices.

Jim

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CD/DVD Drive either not mounting or just not seen on Acer 4810t

CD/DVD Drive either not mounting or just not seen on Acer 4810t

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