[Bug 1320327] Re: configure getty properly on serial consoles using hardware flow control

[Colin Watson]

Hello dann, or anyone else affected,

Accepted finish-install into trusty-proposed. The package will build now
and be available at http://launchpad.net/ubuntu/+source/finish-
install/2.46ubuntu3 in a few hours, and then in the -proposed
repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to
enable and use -proposed.  Your feedback will aid us getting this update
out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, and change the tag
from verification-needed to verification-done. If it does not fix the
bug for you, please add a comment stating that, and change the tag to
verification-failed.  In either case, details of your testing will help
us make a better decision.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance!

** Changed in: finish-install (Ubuntu Trusty)
       Status: In Progress => Fix Committed

** Tags added: verification-needed

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https://bugs.launchpad.net/bugs/1320327

Title:
  configure getty properly on serial consoles using hardware flow
  control

Status in “finish-install” package in Ubuntu:
  Fix Released
Status in “finish-install” source package in Trusty:
  Fix Committed

Bug description:
  [Impact]
  Hardware that uses hardware flow control for the serial console will not run a getty in the correct mode, possibly causing loss of functionality. Canonical would like to enable some such hardware in an upcoming point release.

  [Test Case]
  Use d-i to install a system booted with hardware flow control enabled (e.g. console=ttyS0,115200n8r). On system boot, verify that the getty was started without the "-h" parameter.

  But, I did test this by using a trusty installer w/ the upstream change on an HP Moonshot system, booted with both "console=ttyS0,115200" and "console=ttyS0,115200n8r", and observed no issues. I also confirmed the getty was
  getting configured with the correct parameters in each case.

  [Regression Potential]
  Assuming the upstream fix is correct, the regression potential would be limited to hardware that reports itself as using hardware flow control, but does not actually work with hardware flow control. Discussion on the upstream list suggested this wasn't an issue: https://lists.debian.org/debian-boot/2014/05/msg00130.html

  If the getty hardware flow control is broken, it might leave a system
  more unusable than it would be if incorrectly configured. The testing
  I performed (described above) found no such issues.

  Of course, if the upstream fix is buggy, it could end up breaking the
  serial console configuration.

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