My problem is the following, since an upgrade to Kernel 3.7, my cdrom/DVD drive has dissapeared. There is no trace of /dev/sr0 /dev/cdrom0 and others. The drive does not show up in dmesg.
I see many errors like prereset failed erro = -19 and AE0x300B.
I tried several things, like adding modprobe.blacklist=pata_acpi to grub : GRUB_CMDLINE_LINUX="modprobe.blacklist=pata_acpi" I also tried upgrading to (I believe not supported) 3.7.1-030701-generic and a downgrade to 3.5.4 (here my dvd shows up, but the network is not working). As everything was working in 3.5, I would like to install 3.5.0.21-generic, but I can not find instructions / location how to do this.
Any suggestions ? (both are appreciated : going forward to solve my dvd drive problem or downgrade the kernel).