'Screen Display' app fails to change resolution.

[Max Waterman]

In the 'Screen Display' app, it correctly detects my monitor and presents me with the option of its highest resolution '1920x1200 (16:10)'.

If I select that option and click apply, something goes wrong. I get an error message or two indication some failure to apply the resolution, but it seems like the mouse is behaving as if the resolution has actually changed - ie all the UI elements aren't where they are visually and I have to move the mouse around seeing when the buttons become highlighted in order to click them.

This had me believing that the graphics hardware in this (admittedly limited) laptop wasn't able to drive such a high resolution as a second monitor (even though I had disabled the laptop's one).

However, after a while, I found out that simply unplugging the monitor, and plugging it back in again (in true IT Crowd fashion) fixed the problem and it all works 'just fine'. This fact, has me believing it is something wrong with the software, hence this bug report.

The laptop is a Lenovo S10-3t, 1.9GiB RAM, Intel Atom CPU N450 @ 1.66GHz x 2, *Graphics is Intel Pineview M*, and disk is 155.3GB. OS is Ubuntu 16.04 LTS. (NB, it's quite irritating that I can't select that information from the 'Details' setting window!). Monitor is an HP L2335 :

http://h20564.www2.hp.com/hpsc/doc/public/display?docId=emr_na-c00043201

but it behaves similarly with a BenQ GW2765HT LED IPS which isn't at my current location and I can't recall what resolution it fails at (but it was similar, and not the 2560x1440).

The Lenovo S10-3t has a VGA output, and for the HP I am using a VGA-VGA cable, with a VGA-DVI adaptor into the monitor's DVI port. On the BenQ, I used a straight VGA-VGA cable into the monitor's VGA port. The behaviour was similar on both, so I figured this isn't important, but mention it anyway.

maxw@Lenovo-S10-3t:~$ lsb_release -rd
Description: Ubuntu 16.04.1 LTS
Release: 16.04
maxw@Lenovo-S10-3t:~$ apt-cache policy unity-control-center
unity-control-center:
  Installed: 15.04.0+16.04.20160705-0ubuntu1
  Candidate: 15.04.0+16.04.20160705-0ubuntu1
  Version table:
 *** 15.04.0+16.04.20160705-0ubuntu1 500
        500 http://gb.archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     15.04.0+16.04.20160413-0ubuntu1 500
        500 http://gb.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
maxw@Lenovo-S10-3t:~$

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: unity-control-center 15.04.0+16.04.20160705-0ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-59.80-generic 4.4.35
Uname: Linux 4.4.0-59-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.5
Architecture: amd64
CurrentDesktop: Unity
Date: Tue Jan 31 09:08:54 2017
ExecutablePath: /usr/bin/unity-control-center
InstallationDate: Installed on 2016-06-28 (216 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
ProcEnviron:
 PATH=(custom, no user)
 SHELL=/bin/bash
 LANG=en_GB.UTF-8
 LANGUAGE=en_GB:en
 XDG_RUNTIME_DIR=<set>
SourcePackage: unity-control-center
UpgradeStatus: No upgrade log present (probably fresh install)