Hmm, i dont have any suggestions, but i also have a similar problem. . . first of all can someone tell me what the device mapper is exactly, and if its necessary (can i just turn it off) but at boot up i get this error:
<6>device-mapper: 4.1.0-ioctl (2003-12-10) initialised:
dm@uk.sistina.com
<3>device-mapper: : dm-linear: Device lookup failed
<4>
<4>device-mapper: error adding target to table
<3>device-mapper: : dm-linear: Device lookup failed
<4>
<4>device-mapper: error adding target to table
<3>device-mapper: : dm-linear: Device lookup failed
<4>
<4>device-mapper: error adding target to table
<3>device-mapper: : dm-linear: Device lookup failed
<4>
<4>device-mapper: error adding target to table
<3>device-mapper: : dm-linear: Device lookup failed
<4>
<4>device-mapper: error adding target to table
<3>device-mapper: : dm-linear: Device lookup failed
<4>
<4>device-mapper: error adding target to table
<3>device-mapper: : dm-linear: Device lookup failed
<4>
<4>device-mapper: error adding target to table
<3>device-mapper: : dm-linear: Device lookup failed
<4>
<4>device-mapper: error adding target to table
<3>device-mapper: : dm-linear: Device lookup failed
<4>
<4>device-mapper: error adding target to table
<3>device-mapper: : dm-linear: Device lookup failed
<4>
<4>device-mapper: error adding target to table
<3>device-mapper: : dm-linear: Device lookup failed
<4>
<4>device-mapper: error adding target to table
<3>device-mapper: : dm-linear: Device lookup failed
<4>
<4>device-mapper: error adding target to table
<3>device-mapper: : dm-linear: Device lookup failed
<4>
<4>device-mapper: error adding target to table
<3>device-mapper: : dm-linear: Device lookup failed
<4>
<4>device-mapper: error adding target to table
<3>device-mapper: : dm-linear: Device lookup failed
<4>
<4>device-mapper: error adding target to table
<3>device-mapper: : dm-linear: Device lookup failed
<4>
<4>device-mapper: error adding target to table
<3>device-mapper: : dm-linear: Device lookup failed
<4>
<4>device-mapper: error adding target to table
<3>device-mapper: : dm-linear: Device lookup failed
<4>
<4>device-mapper: error adding target to table
<4>hdd: ATAPI 32X CD-ROM CD-R/RW drive, 4096kB Cache
<6>Uniform CD-ROM driver Revision: 3.20
<6>cdrom: open failed.
<4>end_request: I/O error, dev fd0, sector 0
<4>end_request: I/O error, dev fd0, sector 0
Kernel logging (ksyslog) stopped.
Kernel log daemon terminating.