Arch Linux

nv

Member

Registered: 2006-10-24

Posts: 39

[SOLVED] Devices /dev/{cdrom,dvd} are not set up

Hello everyone,

I installed ARCH on my desktop computer in parallel to an old Ubuntu Linux.

The dvd drive is not recognized properly and the corresponding nodes /dev/{cdrom,dvd} are not set up at all. I don't think it's an hardware issue as the drive is still recognized on the Ubuntu Linux.

To me it looks like a problem with udev or with the kernel not detecting my drive.

Can anyone help me on this issue?

Best regards,

Niklas.

Last edited by nv (2010-06-17 21:34:18)

soloport

Member

Registered: 2005-03-01

Posts: 442

Re: [SOLVED] Devices /dev/{cdrom,dvd} are not set up

Is there a device such as /dev/sr0 ?  Does 'dmesg | grep sr0' show anything?  What udev rules are available? (grep cdrom /lib/udev/rules.d/*)  Modules loaded? (lsmod | grep sr_mod)

nv

Member

Registered: 2006-10-24

Posts: 39

Re: [SOLVED] Devices /dev/{cdrom,dvd} are not set up

There is no /dev/sr0

dmesg | grep sr0 does no show anything.

# grep cdrom /lib/udev/rules.d/*
/lib/udev/rules.d/50-udev-default.rules:# cdrom
/lib/udev/rules.d/60-cdrom_id.rules:  KERNEL=="sr[0-9]*|xvd*", IMPORT{program}="cdrom_id --export $tempnode"
/lib/udev/rules.d/80-udisks.rules:# never access non-cdrom removable ide devices, the drivers are causing event loops on open()
/lib/udev/rules.d/81-arch.rules:# fix ide cdrom detection on old proliant servers
/lib/udev/rules.d/81-arch.rules:ACTION=="add|change", SUBSYSTEMS=="ide", KERNEL=="hd[a-z]", IMPORT="cdrom_id --export $tempnode"
/lib/udev/rules.d/81-arch.rules:ACTION=="add|change", SUBSYSTEMS=="scsi", KERNEL=="sr[0-9]*", IMPORT="cdrom_id --export $tempnode"
/lib/udev/rules.d/81-arch.rules:ACTION=="add|change", SUBSYSTEMS=="scsi", KERNEL=="scd[a-z]", IMPORT="cdrom_id --export $tempnode"
/lib/udev/rules.d/81-arch.rules:ENV{ID_CDROM}=="?*", SYMLINK+="cd/cdrom-%b"
/lib/udev/rules.d/81-arch.rules:ACTION=="add|change", SUBSYSTEMS=="ide", KERNEL=="hd[a-z]", ATTR{removable}=="1", ATTRS{media}=="cdrom*", RUN+="cdsymlinks.sh"
/lib/udev/rules.d/81-arch.rules:SUBSYSTEMS=="ide", KERNEL=="hd[a-z]", ATTR{removable}=="1", ATTRS{media}=="cdrom*", GROUP="optical"

soloport

Member

Registered: 2005-03-01

Posts: 442

Re: [SOLVED] Devices /dev/{cdrom,dvd} are not set up

What does this show?: lsmod | grep sr_mod
When you do: modprobe sr_mod
What does this show?: dmesg

nv

Member

Registered: 2006-10-24

Posts: 39

Re: [SOLVED] Devices /dev/{cdrom,dvd} are not set up

lsmod shows no sr_mod entry.

After doing the modprobe, I will get

$ lsmod|grep sr
sr_mod                 14810  0 
cdrom                  35745  1 sr_mod
scsi_mod               94308  5 sr_mod,usb_storage,sg,sd_mod,libata

But dmesg output is the same as before... ?

soloport

Member

Registered: 2005-03-01

Posts: 442

Re: [SOLVED] Devices /dev/{cdrom,dvd} are not set up

After modprobe, does sr0 show? (ls /dev/sr*)

nv

Member

Registered: 2006-10-24

Posts: 39

Re: [SOLVED] Devices /dev/{cdrom,dvd} are not set up

no, no change in /dev/sr0, sorry.

Strangely enough, I found a sign of sr0 in the kernel.log from this morning:

Jun 14 06:39:17 ruth kernel: sr0: scsi3-mmc drive: 48x/48x writer dvd-ram cd/rw xa/form2 cdda tray
Jun 14 06:39:17 ruth kernel: Uniform CD-ROM driver Revision: 3.20
Jun 14 06:39:17 ruth kernel: sr 0:0:1:0: Attached scsi CD-ROM sr0
Jun 14 06:39:17 ruth kernel: EXT4-fs (sda2): INFO: recovery required on readonly filesystem
Jun 14 06:39:17 ruth kernel: EXT4-fs (sda2): write access will be enabled during recovery
Jun 14 06:39:17 ruth kernel: EXT4-fs (sda2): recovery complete
Jun 14 06:39:17 ruth kernel: EXT4-fs (sda2): mounted filesystem with ordered data mode
Jun 14 06:39:17 ruth kernel: rtc_cmos 00:04: RTC can wake from S4
Jun 14 06:39:17 ruth kernel: rtc_cmos 00:04: rtc core: registered rtc_cmos as rtc0
Jun 14 06:39:17 ruth kernel: rtc0: alarms up to one month, 242 bytes nvram, hpet irqs

I have no idea why it stopped working and I am completely puzzlled.

soloport

Member

Registered: 2005-03-01

Posts: 442

Re: [SOLVED] Devices /dev/{cdrom,dvd} are not set up

Diff of dmesg before modprobe and dmesg after?

Also, just as a sanity check: lsmod | grep scsi

Interrupts looking healthy? cat /proc/interrupts

USB loaded in correct order? cat /etc/modprobe.d/usb-load-ehci-first.conf # if exists

nv

Member

Registered: 2006-10-24

Posts: 39

Re: [SOLVED] Devices /dev/{cdrom,dvd} are not set up

soloport, thanks for taking the time! I really appreciate it.

However, I still have no progress so far:

# dmesg > before
# modprobe sr_mod
# dmesg > after
# diff before after
# lsmod | grep scsi
scsi_mod               94308  5 sr_mod,usb_storage,sg,sd_mod,libata
# cat /proc/interrupts 
           CPU0       CPU1       
  0:         45          1   IO-APIC-edge      timer
  1:          0        349   IO-APIC-edge      i8042
  3:          0          2   IO-APIC-edge    
  6:          0          5   IO-APIC-edge      floppy
  7:          0          0   IO-APIC-edge      parport0
  8:          1        151   IO-APIC-edge      rtc0
  9:          0          3   IO-APIC-fasteoi   acpi
 12:          5       3757   IO-APIC-edge      i8042
 14:          0          1   IO-APIC-edge      pata_atiixp
 15:          0          0   IO-APIC-edge      pata_atiixp
 16:          2        362   IO-APIC-fasteoi   ohci_hcd:usb2, hda_intel
 17:          0          1   IO-APIC-fasteoi   ohci_hcd:usb3, ohci_hcd:usb5
 18:          0          2   IO-APIC-fasteoi   ohci_hcd:usb4, ohci_hcd:usb6
 19:          1       4045   IO-APIC-fasteoi   ehci_hcd:usb1, hda_intel
 22:         38       7900   IO-APIC-fasteoi   ahci, firewire_ohci
 23:          1        555   IO-APIC-fasteoi   eth0
 24:          1       1510   PCI-MSI-edge      radeon
NMI:          0          0   Non-maskable interrupts
LOC:      14436      15867   Local timer interrupts
SPU:          0          0   Spurious interrupts
PMI:          0          0   Performance monitoring interrupts
PND:          0          0   Performance pending work
RES:      24187      21899   Rescheduling interrupts
CAL:         38         32   Function call interrupts
TLB:        347        359   TLB shootdowns
TRM:          0          0   Thermal event interrupts
THR:          0          0   Threshold APIC interrupts
MCE:          0          0   Machine check exceptions
MCP:          1          1   Machine check polls
ERR:          0
MIS:          0
# cat /etc/modprobe.d/usb-load-ehci-first.conf 
install ohci_hcd /sbin/modprobe ehci_hcd ; /sbin/modprobe --ignore-install ohci_hcd $CMDLINE_OPTS
install uhci_hcd /sbin/modprobe ehci_hcd ; /sbin/modprobe --ignore-install uhci_hcd $CMDLINE_OPTS
#

I double-checked that /dev/sr0 is recognized when when booting from my other hard drive (Ubuntu 8.04).

Maybe I have the wrong SATA support loaded from the kernel ? Unfortunately I have no clue if this is the case.

$ lspci|grep SATA
00:12.0 SATA controller: ATI Technologies Inc SB600 Non-Raid-5 SATA
$ lsmod|grep ata
pata_acpi               3224  0 
ata_generic             3079  0 
pata_atiixp             3665  0 
libata                154235  4 pata_acpi,ata_generic,pata_atiixp,ahci
scsi_mod               94308  5 sr_mod,usb_storage,sg,sd_mod,libata

(post edited)

Last edited by nv (2010-06-15 04:54:56)

nv

Member

Registered: 2006-10-24

Posts: 39

Re: [SOLVED] Devices /dev/{cdrom,dvd} are not set up

Hello everyone,

I found some solution to the problem, but I don't yet understand it:

When I pass the kernel option "noapic", then /dev/sr0 is recognized.
However I get some message about the clock when I boot up.

What does this option do and will it affect anything else?

soloport

Member

Registered: 2005-03-01

Posts: 442

Re: [SOLVED] Devices /dev/{cdrom,dvd} are not set up

Do things improve if you boot (from Grub menu) into Arch Linux Fallback?

soloport

Member

Registered: 2005-03-01

Posts: 442

Re: [SOLVED] Devices /dev/{cdrom,dvd} are not set up

Hello everyone,

I found some solution to the problem, but I don't yet understand it:

When I pass the kernel option "noapic", then /dev/sr0 is recognized.
However I get some message about the clock when I boot up.

What does this option do and will it affect anything else?

If you're curious or concerned, try booting with noapic and enter 'cat /proc/interrupts'.  Then compare when booting without noapic.  There may be slight to no difference.  Or it could explain exactly what has been going wrong (e.g. shared or conflicting interrupt).

Last edited by soloport (2010-06-15 14:01:34)

nv

Member

Registered: 2006-10-24

Posts: 39

Re: [SOLVED] Devices /dev/{cdrom,dvd} are not set up

It seems as if I had solved the problem now.

Initially I had stated that this isn't a hardware problem - however, it was.

As soloport had pointed out to me, it was some kind of conflicting interrupts. The problem was solved for me by setting both my two harddrives and my cdrom drive as master. In addition I removed the internal card reader, as I am not using it anyway.

After several reboots I am quite confident that the cd drive is recognized now (and I am not using the 'noapic' kernel line).

Thanks for the assistance,

NV.