Christopher M. Penalver,

Thank you for your help.

1)  I was using Ubuntu 16.04 since July 2016, and 14.04 before.
I think the problem appeared in spring or summer 2017 with an update.
I do not remember since when I put the seconds display in the upper bar. 
I think already in 2014, but without warranty.
In May 2017 I changed my hard disk from a 320 GB with Windows 10 in dual 
boot UEFI to a 1 TB without Windows, and made a fresh install of Ubuntu 
16.04 only.
I do not remember if the problem came at that time or later. There were 
many things to think about,... and other serious problems with the 16.04 
(now solved) .

2)  I clicked on your link about GNOME Flashback, tried a couple of 
clicks, but did not find the way to log in.
How should I do?
What is Metacity?


On the video I joined notice that the blinking of the screen happens 
simultaneously with the display of the seconds. You can improve the 
description in this way.


I discovered Ubuntu in April 2014.
At the beginning it worked by me on a SD card (legacy) to see what it 
was about, and since that time I have learned a lot, and it is not finished.
With Ubuntu/linux it is never finished.


Le 15/02/2018 à 19:16, Christopher M. Penalver a écrit :
> Pierre Wilch:
>
> 1)
>> "So long I remember, this bug appeared before september 2017. No problem in year 2016."
> What version of Ubuntu were you using in 2016 when this was not reproducible?
>   
> 2) To further root cause, could you please test for this problem by logging into a GNOME Flashback (Metacity) session via https://launchpad.net/ubuntu/+source/gnome-flashback and advise to the results?
>
> ** Description changed:
>
> - Ubuntu 16.04.3 LTS, every updates done.
> -
>    Conditions:
>    - in the upper bar the display of the seconds must be enabled
> -   (in my case the entire date-and-time is displayed, excepted the week number);
> - - system has set himself automatically in sleep state after the selected delay
> -   (in my case the option "lock the keyboard" is not enabled).
> +   (in my case the entire date-and-time is displayed, excepted the week number);
> + - system is set to automatically go into sleep state after the selected delay
> +   (in my case the option "lock the keyboard" is not enabled).
>    On awakening, for example by using the shift touch, parts of the screen are blinking according to 1 second rate and 3 seconds cycle.
> - Coming back to normal behavior needs to close and re-open windows (no!, not M$), etc...
> + Coming back to normal behavior needs to close and re-open windows.
>    
>    To help to reproduce:
>    - edit a message with thunderbird;
>    - select ubuntu "parameters";
>    - select "Luminosité & verrouillage" ("Brightness & keyboard locking"?);
>    - select "1 minute";
>    - wait 1 minute and going into sleep state;
>    - when in sleep state press the "shift" key;
>    and then I have a blinking "Christmas tree", too complicated to be described.
>    I tested it again 3 times why writing this post (firefox had also an opened window, under thunderbird; with firefox alone, the screen blinks only one time -should also not-).
> - When the seconds are not displayed in the upper bar there is no problem.
>    
> - Please do not blame me if xorg is not involved. A way to post had to be found.
> - 'apt-cache policy pkgname' with or without sudo: 'Impossible de trouver le paquet pkgname'.
> - ---
> + WORKAROUND: When the seconds are not displayed in the upper bar there is
> + no problem.
> +
> + ---
>    .tmp.unity_support_test.0:
> -
> +
>    ApportVersion: 2.20.1-0ubuntu2.15
>    Architecture: amd64
>    CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
>    CompositorRunning: compiz
>    CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
>    CompositorUnredirectFSW: true
>    CurrentDesktop: Unity
>    DistUpgraded: Fresh install
>    DistroCodename: xenial
>    DistroRelease: Ubuntu 16.04
>    DistroVariant: ubuntu
>    ExtraDebuggingInterest: Yes
>    GraphicsCard:
> -  Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0156] (rev 09) (prog-if 00 [VGA controller])
> -    Subsystem: Toshiba America Info Systems 3rd Gen Core processor Graphics Controller [1179:fb31]
> +  Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0156] (rev 09) (prog-if 00 [VGA controller])
> +    Subsystem: Toshiba America Info Systems 3rd Gen Core processor Graphics Controller [1179:fb31]
>    InstallationDate: Installed on 2017-06-29 (223 days ago)
>    InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215.2)
>    MachineType: TOSHIBA SATELLITE PRO C850-1GR
>    Package: xorg 1:7.7+13ubuntu3
>    PackageArchitecture: amd64
>    ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-32-generic.efi.signed root=UUID=7169ec32-1674-4c34-b45b-2001ed412887 ro quiet splash vt.handoff=7
>    ProcVersionSignature: Ubuntu 4.13.0-32.35~16.04.1-generic 4.13.13
>    Tags:  xenial ubuntu compiz-0.9
>    Uname: Linux 4.13.0-32-generic x86_64
>    UpgradeStatus: No upgrade log present (probably fresh install)
>    UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
>    _MarkForUpload: True
>    dmi.bios.date: 10/01/2013
>    dmi.bios.vendor: Insyde Corp.
>    dmi.bios.version: 6.80
>    dmi.board.asset.tag: Type2 - Board Asset Tag
>    dmi.board.name: PLCSF8
>    dmi.board.vendor: Intel
>    dmi.board.version: Type2 - Board Version
>    dmi.chassis.asset.tag: No Asset Tag
>    dmi.chassis.type: 10
>    dmi.chassis.vendor: OEM Chassis Manufacturer
>    dmi.chassis.version: OEM Chassis Version
>    dmi.modalias: dmi:bvnInsydeCorp.:bvr6.80:bd10/01/2013:svnTOSHIBA:pnSATELLITEPROC850-1GR:pvrPSCBXE-01T01GFR:rvnIntel:rnPLCSF8:rvrType2-BoardVersion:cvnOEMChassisManufacturer:ct10:cvrOEMChassisVersion:
>    dmi.product.family: Type1Family
>    dmi.product.name: SATELLITE PRO C850-1GR
>    dmi.product.version: PSCBXE-01T01GFR
>    dmi.sys.vendor: TOSHIBA
>    version.compiz: compiz 1:0.9.12.2+16.04.20160823-0ubuntu1
>    version.ia32-libs: ia32-libs N/A
>    version.libdrm2: libdrm2 2.4.83-1~16.04.1
>    version.libgl1-mesa-dri: libgl1-mesa-dri 17.2.4-0ubuntu1~16.04.4
>    version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
>    version.libgl1-mesa-glx: libgl1-mesa-glx 17.2.4-0ubuntu1~16.04.4
>    version.xserver-xorg-core: xserver-xorg-core N/A
>    version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
>    version.xserver-xorg-video-ati: xserver-xorg-video-ati N/A
>    version.xserver-xorg-video-intel: xserver-xorg-video-intel N/A
>    version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau N/A
>