mini-preview of minimized Google Chrome windows blank

[Jon Smirl]

Open some browser windows in Chome
Minimize half of those windows
Now click on Chrome in the Unity bar.
The mini-previews of the minimized windows are blank.

This was working in Natty.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: unity 4.22.0-0ubuntu3
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
Uname: Linux 3.0.0-12-generic x86_64
ApportVersion: 1.23-0ubuntu3
Architecture: amd64
CompizPlugins: [core,bailer,detection,composite,opengl,decor,compiztoolbox,place,grid,mousepoll,wall,gnomecompat,regex,animation,imgpng,resize,move,vpswitch,session,unitymtgrabhandles,workarounds,fade,expo,ezoom,scale,unityshell]
Date: Fri Oct 14 09:22:42 2011
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
SourcePackage: unity
UpgradeStatus: Upgraded to oneiric on 2011-10-13 (0 days ago)

[Launchpad Janitor (janitor)]

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

[Jon Smirl (jonsmirl)]

Probably related to this bug....

I have a web app that closes the browser window when it is done. If this window is minimized while it closes Unity gets really confused about the state of which Chrome windows are minimized and which are open. Unity probably has a list of minimized Chrome windows - when the script inside of the Chrome window closes the window while minimized, it appears that Unity's window tracking list gets out of sync with the Chrome windows thus confusing their state of being open or minimized.

I believe this was also working correctly in Natty but I'm not 100% sure. It is definitely broken in Ocelot.

[Omer Akram (om26er)]

thanks for your bug report. Is that still an issue in Ubuntu 12.04? Can you please test that and let us know?

[Jon Smirl (jonsmirl)]

Still broken.

Version 19.0.1084.56
Ubuntu Precise

Open multiple windows in Chrome. Minimize them.
Click on Chrome icon in Unity sidebar.
Note that most of the min-preview windows are white, blank squares.

Get annoyed. Play window roulette until you find the one you are looking for.

[Jon Smirl (jonsmirl)]

This may be related to Chrome's
Appearance: "Use system title bar and borders"

If I turn that option on I couldn't get the problem to happen in my limited testing. But with it off I was still able to get the white squares on Precise.

[Omer Akram (om26er)]

Please attach a screenshot of the problem so that we could be sure if its a duplicate of an already reported bug.

[Jon Smirl (jonsmirl)]

All four of these previews should have web pages in them.

This is four open Chrome windows that were minimized. Then I clicked on the Chrome icon in the Unity bar to see the previews of the minimized windows.

[Daniel van Vugt (vanvugt)]

Jon, are you using NVIDIA? (bug 977189)

[Jon Smirl (jonsmirl)]

Intel on one machine, ATI on another. Both have the problem. Both are using stock Ubuntu video drivers.

[Bilal Akhtar (bilalakhtar)]

So it only happens when "Use system title bars and borders" is UN-checked?

[Omer Akram (om26er)]

aaha, successfully reproduced here on Quantal. Bilal's guess is actually right. It happenes when "Use system title bars and borders" is unchecked.

[Omer Akram (om26er)]

since minimized window previews are part of Unity code I am not quite sure if compiz should be added as affects or not.

[Greggth (greggth)]

Hi,
I think I'm having the same problem, as well as another related one.
1) I see similar, but slightly different behavior with the preview:
"Use system title bar and borders" *checked* -- preview broken sometimes.
"Use system title bar and borders" *unchecked" -- preview broken sometimes.

2) The other problem: After being minimized, the window comes up all white except for the title bar. It doesn't re-render the screen until it's resized. This is really annoying, but I don't know if should be considered part of the same bug. There's another bug in Chromium that sounds somewhat like this, but maybe not exactly the same either (https://code.google.com/p/chromium/issues/detail?id=340138)
"Use system title bar and borders" *checked* window restores as blank white window.
"Use system title bar and borders" *unchecked* window restores properly

[Greggth (greggth)]

I probably should have included more system info:
Ubuntu 12.04.5 LTS, Precise Pangolin
Chrome 37.0.2062.94 (64-bit)
Video card: nvidia GF108GL [Quadro 600]

[Rodrigo Lledó (rodhos-hp)]

Thank you for taking the time to report this bug. We have tried to recreate this on the latest release of Ubuntu, but cannot reproduce it. This bug is being marked as Invalid. If you believe the problem to still exist in the latest version of Ubuntu, please comment on why that is the case and change the bug status to NEW.

Ubuntu 15.10, Wily Werewolf (64 bits)
Chrome 46.0.2490.86 (64-bit)
Video card: Wrestler [Radeon HD 6290]

[Rodrigo Lledó (rodhos-hp)]

Tested with "Use system title bar and borders" checked and unchecked.