I install slack 10.1 with kernel 2.4.29 and kernel 2.6.10, well I had both kernsl in my system when I boot up with kernel 2.4.29 slack recognizes the CD-rom device which is

/dev/hdc

But when I boot up with the kernel 2.6.10 slack doesn´t mount the cdrom device in fact I went to /dev and the device hdc isn´t there but is correct in fstab, and it boot with the kernel 2.4.29 I must said I haven´t compile both kernels I just used them cause they where in slack install CD, for the kernel 2.6.10 I install the source, the headers and the kernel generic. Any help? someone told me to emule scsi device in the Xorg.conf and that will fix it how I do that..

You don't need scsi emulation in the 2.6 kernels anymore. In you /etc/lilo.conf file put a # in front of the append=hdc=ide-scsi and it'll work again, be sure to run /sbin/lilo after you made the change. It should look like this in the end...


# Start LILO global section
boot = /dev/hda
#append = "hdc=ide-scsi" <--- here
#compact # faster, but won't work on all systems.

And after editing, reinstalling lilo (#lilo) and rebooting,
you can see where you cdrom is by reading the
$dmesg content.
Then edit your /etc/fstab to tell the system where it should look
for a cdrom drive when it is requested to mount the drive.

I haven't put scsi support in lilo.conf a friend of mine told me to, but I haven't done it and my cdrom still doesn't recognize by kernel 2.6.x but for kernel 2.4.29 does, what can I do here I don't want to compile the kernel 2.6.x is there anyway I could transfer the support module cdrom of kernel 2.4.29 to my kernel2.6.x

Post the lilo part that boot to 2.6 kernel,
post the output with : dmesg | grep CD
and finally post the output with : grep cdrom /etc/fstab

So we have helpfull infos from your system and we could bring
you some precise help