Disabling DMA aparently solve the problem but this is a new behavior.
I've DMA actived since 5.10 because DVD is too slow w/out it.
$ sudo hdparm -I /dev/hdb
/dev/hdb:
ATAPI CD-ROM, with removable media
Model Number: PHILIPS CD-RW/DVD-ROM SCB5265
Serial Number:
Firmware Revision: TX07
Standards:
Likely used CD-ROM ATAPI-1
Configuration:
DRQ response: 50us.
Packet size: 12 bytes
Capabilities:
LBA, IORDY(can be disabled)
DMA: sdma0 sdma1 sdma2 mdma0 mdma1 mdma2 udma0 udma1 *udma2
Cycle time: min=120ns recommended=120ns
PIO: pio0 pio1 pio2 pio3 pio4
Cycle time: no flow control=120ns IORDY flow control=120ns
The console get freeze and shutdown failed to complete after a try to turn it
on again after several some hours working w/out problem.
--
Ubuntu freeze for a while - lost interrupt reported
https://launchpad.net/bugs/64741
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