weird color display after suspend.

[brad]

I restart the display manager then the display is fine again.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: lightdm 1.18.3-0ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-64.85-generic 4.4.44
Uname: Linux 4.4.0-64-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.5
Architecture: amd64
CurrentDesktop: Unity
Date: Tue Feb 28 09:24:44 2017
InstallationDate: Installed on 2016-03-31 (334 days ago)
InstallationMedia: Ubuntu 14.04.4 LTS "Trusty Tahr" - Release amd64 (20160217.1)
SourcePackage: lightdm
UpgradeStatus: Upgraded to xenial on 2016-10-19 (131 days ago)

[Launchpad Janitor (janitor)]

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

[Ubfan (ubfan1)]

This week, I started getting 1 cm boarders around windows after a suspend. The boarders are white with colored speckles and lines. Hardware is Nvidia Quadro 1000m, with the nvidia 375.39 driver. This driver must have just been updated from the 367.57 driver which never had any problems. Restarting lightdm or logging out then in again fixes the problem. The software updater/additional drivers tab only offers the 375.39 (tested), the 340.102 and the 304.135 Nvidia drivers, not the 367... version.

[Leonardo de la Cerda (kaiserleo)]

I found the same bug.
This is my graphic card (but I'm not sure how to check the driver version):
Video Card: NVIDIA Corporation GM206 [GeForce GTX 960] (rev a1)
OS version: Ubuntu 16.04.2 LTS

I think that those "funny" colors space is the video card memory that wasn't refreshed. Maybe during the suspend it got some noise values and it should be fixed with a 'redraw' call.
But I'm no expert on Ubuntu or video card code :P