k3b and cdrecord problem

[Michael Thaler <michael.thaler@physik.tu-muenchen.de>]

Hello,

I cannot burn cds with k3b anymore. If I try to burn a cd I get the following 
error message from k3b:

System
-----------------------
K3b Version: 0.12

KDE Version: 3.4.2
QT Version:  3.3.5
Kernel:      2.6.12
Devices
-----------------------
PLEXTOR CD-R   PX-W5224A 1.02 (/dev/hdd, ) at /cdburner [CD-R; CD-RW; CD-ROM] 
[CD-ROM; CD-R; CD-RW] [SAO; TAO; RAW; SAO/R96P; SAO/R96R; RAW/R16; RAW/R96P; 
RAW/R96R]

TOSHIBA ODD-DVD SD-M1802 1030 (/dev/hdc, ) at /cdrom [CD-ROM; DVD-ROM] 
[DVD-ROM; CD-ROM] [None]
K3b
-----------------------
Size of filesystem calculated: 359000

Used versions
-----------------------
mkisofs: 2.1.1a03-unofficial-iconv
cdrecord: 2.1.1a03

cdrecord
-----------------------
/usr/bin/cdrecord: Warning: Running on Linux-2.6.12
/usr/bin/cdrecord: There are unsettled issues with Linux-2.5 and newer.
/usr/bin/cdrecord: If you have unexpected problems, please try Linux-2.4 or 
Solaris.
/usr/bin/cdrecord: Operation not permitted. WARNING: Cannot set RR-scheduler
/usr/bin/cdrecord: Permission denied. WARNING: Cannot set priority using 
setpriority().
/usr/bin/cdrecord: WARNING: This causes a high risk for buffer underruns.
scsidev: '/dev/hdd'
devname: '/dev/hdd'
scsibus: -2 target: -2 lun: -2
Warning: Open by 'devname' is unintentional and not supported.
Linux sg driver version: 3.5.27
Error: Cannot gain SYS_RAWIO capability.Is cdrecord installed SUID root?
: Operation not permitted
/usr/bin/cdrecord: Warning: using inofficial version of libscg 
(ubuntu-0.8ubuntu1 '@(#)scsitransp.c 1.91 04/06/17 Copyright 
1988,1995,2000-2004 J. Schilling').
SCSI buffer size: 64512
Cdrecord-Clone 2.01.01a03 (i686-pc-linux-gnu) Copyright (C) 1995-2005 Joerg 
Schilling
NOTE: this version of cdrecord is an inofficial (modified) release of cdrecord
      and thus may have bugs that are not present in the original version.
      Please send bug reports and support requests to 
<cdrtools@packages.debian.org>.
      The original author should not be bothered with problems of this 
version.
TOC Type: 1 = CD-ROM
Using libscg version 'ubuntu-0.8ubuntu1'.
Driveropts: 'burnfree'
atapi: 1
Device type    : Removable CD-ROM
Version        : 0
Response Format: 1
Vendor_info    : 'PLEXTOR '
Identifikation : 'CD-R   PX-W5224A'
Revision       : '1.02'
Device seems to be: Generic mmc CD-RW.
Current: 0x0009
Profile: 0x0008 
Profile: 0x0009 (current)
Profile: 0x000A 
/usr/bin/cdrecord: Operation not permitted. Cannot send SCSI cmd via ioctl

I changed the group of cdrecord to cdrom

ls -l /usr/bin/cdrecord*
-rwxr-xr-x  1 root cdrom    133 2005-09-21 03:17 /usr/bin/cdrecord
-rwxr-x---  1 root cdrom 323540 2005-09-21 03:17 /usr/bin/cdrecord.mmap
-rwxr-xr-x  1 root cdrom 323540 2005-09-21 03:17 /usr/bin/cdrecord.shm

and I am a member of the cdrom group:

groups
michi cdrom audio staff scanner

I also changed the group of /dev/hdd to cdrom:
ls -l /dev/hdd
brw-rw----  1 root cdrom 22, 64 2004-01-01 01:31 /dev/hdd

I also cannot burn cd-images with cdrecord itself. The error message is the 
same. But I can burn cds as root. I used to have installed cdrecord as suid 
root and then it worked also for normal users, but it seems this does not 
work anymore with kernels >=2.6.8. What do I have to do to burn cds as normal 
user with k3b/cdrecord?

Greetings,
Michael