Chegou a fazer aquela pesquisa que mencionei no post #6 para ver se aparece algo relevante relativo à unidade de cdrom na carga do sistema?
dmesg | grep -i cd-rom -A7
Aqui:
dmesg | grep -i cd-rom -A7
[ 2.337039] scsi 4:0:0:0: CD-ROM hp DVDRAM GT31N NMR0 PQ: 0 ANSI: 5
[ 2.359220] sr 4:0:0:0: [sr0] scsi3-mmc drive: 24x/24x writer dvd-ram cd/rw xa/form2 cdda tray
[ 2.359227] cdrom: Uniform CD-ROM driver Revision: 3.20
[ 2.359563] sr 4:0:0:0: Attached scsi CD-ROM sr0
[ 2.359942] sr 4:0:0:0: Attached scsi generic sg1 type 5
[ 2.373225] sda: sda1 sda2 sda3 sda4
[ 2.374622] sd 2:0:0:0: [sda] Attached SCSI disk
[ 2.377131] hid-generic 0003:0603:1605.0001: input,hidraw0: USB HID v1.10 Keyboard [USB Device HID Compliant Device] on usb-0000:00:12.0-1/input0
[ 2.378493] input: USB Device HID Compliant Device as /devices/pci0000:00/0000:00:12.0/usb7/7-1/7-1:1.1/0003:0603:1605.0002/input/input7
[ 2.379012] hid-generic 0003:0603:1605.0002: input,hiddev0,hidraw1: USB HID v1.10 Mouse [USB Device HID Compliant Device] on usb-0000:00:12.0-1/input1
[ 2.472505] usb 8-2: new full-speed USB device number 2 using ohci-pci