Ubuntu 9.04 hangs on ThinkPad Ultrabay drive eject

[Jakub Maleszewski]

Hello,

I found problem in new Ubuntu 9.04 with kernel. On my ThinkPad T41p (2373-GEG) it hangs when I use "echo eject > /proc/acpi/ibm/bay" to eject my UltraBay drive to save power. On other distributions and on Ubuntu 9.04 Alpha 5 it works (it's strange that something works on alpha but not on stable).

Steps to reproduce:

1. Boot Ubuntu on your T41p (I think other ThinkPads are also affected)
2. Type in terminal as root "echo eject > /proc/acpi/ibm/bay"
3. Happy system hang :)

When Ubuntu is started in single-user mode, everything works without problems. So on login screen I switched to console with Ctrl+Alt+F1, logged in and typed "echo eject...". There are kernel messages:

ata2.00: ST_FIRST: !(DRQ|ERR|DF)
ata2.00: cmd a0/00:00:00:00:00/00:00:00:00:00/a0 tag 0
              cdb 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
              res 00/00:00:00:00:00/00:00:00:00:00/00 Emask 0x2 (HSM violation)

After that Ubuntu simply hangs.

Any help will be appreciated.

and sorry for my bad english :)