Lubuntu impish:

I haven't noticed it (tray eject) in impish on my primary box for awhile
(since I last rebooted most likely; uptime 10 days)

- dell [optiplex] 960 (c2q-q9400, 8gb, amd/ati cedar radeon hd
5000/6000/7350/8350)

or at least my last QA-test install on another box

- dell [optiplex] 780 (c2q-q9400, 8gb, amd/ati cedar radeon hd
5000/6000/7350/8350)

I didn't go looking for it specifically; but did note it in the QA-test
report(s) I filed (ISO dated 20210925 most probably going by Lubuntu QA
Checklist) as the tray used to eject during boot (that box is used in
QA-testing at least once every 5-8 days)

My current system is running `5.13.0-16-generic` I note.

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https://bugs.launchpad.net/bugs/1942299

Title:
  CD/DVD tray ejects on boot or waking from suspend

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Bionic:
  Fix Released
Status in linux source package in Focal:
  Fix Released
Status in linux source package in Hirsute:
  Fix Released
Status in linux source package in Impish:
  Fix Released

Bug description:
  [Impact]

  A regression was introduced via upstream -stable patches which causes
  the CD / DVD rom drive to open when the system boots, or wakes from
  suspend.

  This has had some side effects on some systems where you cannot insert
  media at all, since the drive will eject as soon as the tray is
  closed.

  The problematic patch is:

  commit 7dd753ca59d6c8cc09aa1ed24f7657524803c7f3
  Author: ManYi Li <[email protected]>
  Date:   Fri Jun 11 17:44:02 2021 +0800
  Subject: scsi: sr: Return appropriate error code when disk is ejected
  Link: 
https://github.com/torvalds/linux/commit/7dd753ca59d6c8cc09aa1ed24f7657524803c7f3

  This was backported to:

  Bionic 4.15.0-155-generic
  Focal 5.4.0-82-generic
  Hirsute 5.11.0-32-generic
  Impish 5.13.0-1-generic

  [Fix]

  The issue was fixed in the below commit:

  commit 5c04243a56a7977185b00400e59ca7e108004faf
  Author: Li Manyi <[email protected]>
  Date:   Mon Jul 26 19:49:13 2021 +0800
  Subject: scsi: sr: Return correct event when media event code is 3
  Link: 
https://github.com/torvalds/linux/commit/5c04243a56a7977185b00400e59ca7e108004faf

  This patch is already applied to Ubuntu kernels through upstream
  -stable, and will land in the following releases, currently in
  -proposed:

  Bionic 4.15.0-159-generic
  Focal 5.4.0-87-generic
  Hirsute 5.11.0-37-generic
  Impish 5.13.0-16-generic

  [Testcase]

  If your machine is affected, the CD / DVD rom drive will eject and /
  or open during boot or waking from suspend.

  This can be seen on some hypervisors, particularly VMware.

  [Where problems could occur]

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