Onboard keyboard doesn't scale correctly at lock screen

[Ian Hurley]

When setting "Scale for menu and title bars" to (2) in screen / display settings && setting Onboard on screen keyboard to "Show when unlocking the screen" (tick) in Onboard general preferences, the on screen keyboard is tiny and very difficult to use on the lock screen, but fine (full size) whilst logged in. I'm guessing it doesn't obey the scaling setting while on the lock screen.

I have a high DPI screen and have to use "Scale for menu and title bars" set to (2) in display / screen settings for my HP Spectre x360 (4109NA) to be usable. It has a touchscreen + 360 degree hinge and I have a little script on a launcher button to xinput float and reattach the keyboard/touchpad so I can use it in tablet mode. If the device locks while my keyboard/touchpad is disconnected, it's a nuisance to log back in with a USB keyboard (or log in as a guest which I've learned auto reattaches the keyboard / touchpad somehow). The weird thing is I'm sure I've seen the on screen keyboard display properly on the lock screen at some point so I don't know why it's misbehaving now.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: onboard 1.2.0-0ubuntu5
ProcVersionSignature: Ubuntu 4.4.0-22.40-generic 4.4.8
Uname: Linux 4.4.0-22-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CurrentDesktop: Unity
Date: Thu Jun 9 23:39:30 2016
EcryptfsInUse: Yes
InstallationDate: Installed on 2016-04-23 (47 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
ProcEnviron:
 LANGUAGE=en_GB:en
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: onboard
UpgradeStatus: No upgrade log present (probably fresh install)

[marmuta (marmuta)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug #1572331, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Feel free to continue to report any other bugs you may find.

Bug #1572331 also affects the login screen, see bug #1562734 for that.

> The weird thing is I'm sure I've seen the on screen keyboard
> display properly on the lock screen at some point so I don't
> know why it's misbehaving now.
I thought so too, I was pretty sure I had successfully tested the lock screen with scaling=2 before. But then for bug #1572331 I went and tried old Ubuntu releases with old and new revisions of Onboard and it was always the same tiny keyboard. Weird.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.