"SMART data" and "Drive settings" not available for USB hard drives

[Erik Csin]

When I open Disk Utility I can see SMART status and modify drive settings for my internal hard drive but not for external hard drives connected by USB. It used to work the first weeks after I fresh Installed Ubuntu 15.04 but now "SMART Data & Self-Tests", "Drive Settings" and "Standby Now" are greyed out for USB hard drives. Also, Disk Utility shows "Model", "Size", "Partitioning" and "Serial Number" but no "Assessment" for USB hard drives. I've attached a screenshot showing the internal drive on the left side and a USB hard drive on the right where we can see the missing "Assessment" information and the greyed out "SMART Data & Self-Tests", "Drive Settings" and "Standby Now".

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: gnome-disk-utility 3.14.0-0ubuntu2
ProcVersionSignature: Ubuntu 3.19.0-20.20-generic 3.19.8
Uname: Linux 3.19.0-20-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.17.2-0ubuntu1.1
Architecture: amd64
CurrentDesktop: Unity
Date: Thu Jun 11 04:47:13 2015
InstallationDate: Installed on 2015-04-24 (47 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
SourcePackage: gnome-disk-utility
UpgradeStatus: No upgrade log present (probably fresh install)

[Sebastien Bacher (seb128)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. The issue you are reporting is an upstream one and it would be nice if somebody having it could send the bug to the developers of the software by following the instructions at https://wiki.ubuntu.com/Bugs/Upstream/GNOME. If you have done so, please tell us the number of the upstream bug (or the link), so we can add a bugwatch that will inform us about its status. Thanks in advance.