Re: [gentoo-user] /dev/sr0 has disappeared: big mystery

[Helmut Jarausch <jarausch@igpm.rwth-aachen.de>]

On 15 May, Philip Webb wrote:
> For the 1st time in 2 months, I went to write a CD & discovered
> that  /dev/sr0  is not being created nor symlink  /dev/cdrom ;
> I looked at 'dmesg': no mention of 'sr' or 'cd' being found.
> 
> I've searched the Forum (more noise than signal as usual) & Bugs: nothing.
> 
> I tested the drive: SystemRescue 1.1.0 (kernel 2.6.25.16) starts correctly
> & mounts  /dev/sr0  on  /mnt/cdrom ; its 'dmesg' says :
> 
>   sr0: scsi3-mmc drive: 16x/16x writer dvd-ram cd/rw xa/form2 cdda tray \
>   Uniform CD-ROM driver Revision: 3.20
> 
> BIOS reports "Auto-detecting PATA primary master: ATAPI CD-ROM".
> 
> I updated to Hal-0.5.11-r8 on 090221 & Udev-124-r2 on 090418 ;
> I recompiled Udev, but that made no difference.
> I've checked the files which mention 'cd' in  /etc/udev/rules.d
> & there is no difference today from those at 090315 ,
> when I did my last system back-up & last used the CD drive.
> 
> I've checked my kernel configs for 2.6.25 & 2.6.29 using 'gvimdiff'
> & there is no difference between the relevant sections in Devices.
> I updated to 2.6.29 on 090404 .
> 
> I tried my other kernels with the following unnerving findings :
> 2.6.25 creates /dev/sr0 , but after X starts the mouse/keyboard fail;
> 2.6.23 & 2.6.22 create /dev/sr0 , but X won't start at all.
> 
> I notice that under 'Device Drivers -> ATA/ATAPI/MFM/RLL Support'
> there are the lines :
> 
>   generic ATA/ATAPI disk support (NEW)
>   [*]     ATA disk support (NEW)
>   [ ]     ATAPI floppy support (NEW)
>   < >   Include IDE/ATAPI CDROM support (NEW)  
> 
> I didn't say 'y' to 'ATA ... Support', so both config files (25 & 29) say
> 
>   # CONFIG_IDE is not set
> 
> This is because I understood that if you have
> 'SCSI device support -> SCSI CDROM support' enabled,
> then you shouldn't have 'ATA...RLL' enabled as well.
> Is this a vital change in 2.6.29 ?
> 
> Has anyone else encountered this ?  Does anyone have suggestions ?
> 

Is your CDwriter a SATA device?

Here, 2.6.29-r3 works just fine with my SATA-dvd-writer.

-- 
Helmut Jarausch

Lehrstuhl fuer Numerische Mathematik
RWTH - Aachen University
D 52056 Aachen, Germany