I see this on a Intel HD 4000 as well, on xenial. (Thinkpad x230)
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Password required twice returning from suspend
Status in xserver-xorg-video-nouveau package in Ubuntu:
Clean install - no updates available. Also present on a previous
Suspend machine and restart.
Lock screen requiring password - enter password and return to
Within a few seconds machine locks and password is required once more.
Using the same hardware I've installed nvidia 340.96 and tried to
reproduce the issue without success.
DistroRelease: Ubuntu 16.10
Package: xserver-xorg-video-nouveau 1:1.0.12-2
ProcVersionSignature: Ubuntu 4.8.0-21.23-generic 4.8.0
Uname: Linux 4.8.0-21-generic x86_64
Date: Mon Oct 10 14:59:56 2016
InstallationDate: Installed on 2016-06-11 (120 days ago)
InstallationMedia: Xubuntu 16.10 "Yakkety Yak" - Alpha amd64 (20160611)
UpgradeStatus: No upgrade log present (probably fresh install)
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