SOLVED - No optical drive in /dev/

shenryu · n00b Joined: 14 Feb 2010 Posts: 16 Location: Warsaw

hello, i have found similar threads about cdrom issue but nothing exacly like my problem. I want to access my optical drive which is BENQ DVD LS DW1655 but there is nothing like dvd, cdrom, hdc in my /dev/. also in /media/ there is only .keep_sys-apps_hal-0
dmesg output is:

Sadako · Posted: Wed Mar 24, 2010 8:19 pm Post subject:

What does `ls -l /dev | grep 'hdc\|sr0'` return?
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shenryu · n00b Joined: 14 Feb 2010 Posts: 16 Location: Warsaw

ls -l /dev | grep 'hdc\|sr0' gives me nothing. also combination with dvd and cdrom does not return anything

keep on suggesting

RedSquirrel · Guru Joined: 22 Apr 2008 Posts: 336

Can you post the output of:

VoidMage · Watchman Joined: 14 Oct 2006 Posts: 6196

You probably just need CONFIG_BLK_DEV_SR set.

eccerr0r · Posted: Wed Mar 24, 2010 10:36 pm Post subject:

The kernel config and hard disk config seem to conflict.

Apparently both SATA and ATA disks are enabled or something, else you wouldn't have both the 120G and the 250G HDDs showing up. Most controllers should now be supported by libata.

That being said, quite possibly an old version of the kernel is being used that's conflicting with the current .config. My guess is that the legacy ATA/ATAPI/EIDE drivers are being used and its CDROM support is disabled. That will need to be enabled so it can control both the IDE HDD at /dev/hda as well as enable the cdrom at /dev/hdc.

Either try that or completely disable the ATA drivers and enable PATA support for libata for your PATA controller. Since legacy PATA is detected first, the PATA optical drive is eaten up by that driver (with missing cd support) and the SATA-libata driver can no longer claim it, rendering its sr driver useless.

A lspci could be useful to determine what PATA you have...
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shenryu · n00b Joined: 14 Feb 2010 Posts: 16 Location: Warsaw

eccerr0r:
im using 2.6.33 gentoo-sources, that should be more than new enough. or is it too new? could you tell me how to go full libata then? i thought that if i disable ATA/ATAPI/MFM/RLL support (DEPRECATED) then i go libata. in this case it is wrong i suppose.

RedSquirrel:
i have only those two options enabled under Serial ATA and Parallel ATA drivers. should i enable anything else?

eccerr0r · Posted: Thu Mar 25, 2010 5:32 pm Post subject:

RedSquirrel · Guru Joined: 22 Apr 2008 Posts: 336

shenryu · n00b Joined: 14 Feb 2010 Posts: 16 Location: Warsaw

i have added AMD/NVidia PATA support to the kernel but it seems that nothing changed. still no optical-drive support. what more can i post to make it easier for you to help me?
the drive is ok coz i have installed gentoo using it. any ideas?

RedSquirrel · Guru Joined: 22 Apr 2008 Posts: 336

The output of the following commands might be useful to see the current state of affairs:

eccerr0r · Posted: Fri Mar 26, 2010 3:00 am Post subject:

You need to remove BLK_DEV_AMD74XX

If you're having trouble locating why this is selected, select IDE_ATAPI and your optical disk should show up under /dev/hdc.
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VoidMage · Watchman Joined: 14 Oct 2006 Posts: 6196

I think the point of this thread should be proper migration to pure libata,
not creating /dev/hdx for and optical drive.

eccerr0r · Posted: Fri Mar 26, 2010 2:31 pm Post subject:

NeddySeagoon · Posted: Fri Mar 26, 2010 7:04 pm Post subject:

eccerr0r,

This usually happens when you compile one kernel and run another.

The output of

shenryu · n00b Joined: 14 Feb 2010 Posts: 16 Location: Warsaw

i have only 2.6.33 kernel and only one kernel image so there is no way i could use the other one. after compiling i have copied new kernel image from /usr/src/linux/arch/x86_64/boot/bzImage to /boot/mykernel.
if i did not mess things up there should my kernel config http://pastebin.com/ZSAmMRHs

VoidMage · Watchman Joined: 14 Oct 2006 Posts: 6196

As kernel config does look sane, there may be one more thing involved:
what does 'lsmod' print ?
Also, setting CONFIG_IKCONFIG and CONFIG_IKCONFIG_PROC is often helpful
- in such case you can be sure it's the right config by checking /proc.

NeddySeagoon · Posted: Fri Mar 26, 2010 8:52 pm Post subject:

shenryu,

shenryu · n00b Joined: 14 Feb 2010 Posts: 16 Location: Warsaw

i have posted lsmod in the previous post. its the second from bottom. there is only nvidia module.
i do not have any other kernel configs than .config and .config.old so there is no way for a mistake. i use only default .config one.

/edit
NeddySeagoon i was writing my post when you posted.

my /boot partition is always auto-mounted during boot thanks to fstab.
the timestamp on bzimage and .config is the same as /boot/kernel

NeddySeagoon · Posted: Fri Mar 26, 2010 9:24 pm Post subject:

shenryu,

Your kernel config looks OK but its not working, so either the .config file is wrong or the .config file you are showing us is not being used.#
Thats really the only two options.

Oh, there is a a third option ... you have been editing the .config file directly, it which case all bets are off as many make menuconfig options operate on three or four options in the config file and its very easy to produce a nonsense .config that produces a broken kernel.
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shenryu · n00b Joined: 14 Feb 2010 Posts: 16 Location: Warsaw

ok. so how i can check if my .config is ok? ill make a new one to be sure everything is ok.
i remember myself looking into .config directly but the purpose was not to change anything, but accidents happen

NeddySeagoon · Posted: Fri Mar 26, 2010 9:48 pm Post subject:

shenryu,

Looking with less is always harmless. Looking with an editor may not be.

Did you check the timestamps?
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NeddySeagoon

Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail.

shenryu · n00b Joined: 14 Feb 2010 Posts: 16 Location: Warsaw

hehe, you r right

i have checked timestamps and those are correct.
im compiling a new kernel image based on a total new config file made from scratch.
hope it helps

/edit
NeddySeagoon, u were right. kernel config was messed up. when i made a new one everything is working as it should be.
thank you and others for help