Public bug reported:
In Vivid on connection of external display using displayport to VGA
adaptor all resolutions upto max of my monitor were supported.
Since upgrade to Wily while my internal display operates correctly the
external display only shows resolutions up to 1024x768 as available, eg:
xrandr
Screen 0: minimum 8 x 8, current 1366 x 768, maximum 32767 x 32767
eDP1 connected primary 1366x768+0+0 (normal left inverted right x axis y axis)
256mm x 144mm
1366x768 60.00*+
1360x768 59.80 59.96
1280x720 60.00
1024x768 60.00
1024x576 60.00
960x540 60.00
800x600 60.32 56.25
864x486 60.00
640x480 59.94
720x405 60.00
680x384 60.00
640x360 60.00
DP1 connected (normal left inverted right x axis y axis)
1024x768 60.00
800x600 60.32 56.25
848x480 60.00
640x480 59.94
ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: xorg 1:7.7+7ubuntu4
ProcVersionSignature: Ubuntu 4.2.0-16.19-generic 4.2.3
Uname: Linux 4.2.0-16-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.19.1-0ubuntu3
Architecture: amd64
CurrentDesktop: MATE
Date: Mon Oct 26 10:00:40 2015
InstallationDate: Installed on 2015-07-29 (88 days ago)
InstallationMedia: Ubuntu-MATE 15.04 "Vivid Vervet" - Release amd64 (20150422.1)
SourcePackage: xorg
Symptom: display
UpgradeStatus: Upgraded to wily on 2015-10-22 (3 days ago)
** Affects: xorg (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolution wily
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https://bugs.launchpad.net/bugs/1510021
Title:
After upgrade from vivid to wily external monitor has only limited
resolutions
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