After I put my computer on sleep, when I turn it back on, my screen freeze like this. Why?

Question

I use ubuntu 11.10. My display freeze when I put my computer on sleep. So on wake-up, I'm forced to restart it. I tried with 2 differents screen and same result. Why?

PS: I would upload a screen-shot but my reputation points is not high enough.

Solution

You mention that you still have computer and mouse, but without a screen I'm not sure how you know this?

One thing to try - press CTRL-ALT-F1 to switch to another terminal. If you see the terminal output, which is just a few lines of text at the top of a black screen, then this is just an issue with waking your screen up properly after resume, usually fixed by blacklisting certain modules from sleeping when you suspend.

Comments

[Scaine]

It would be helpful to add some detail, Marc. What kind of video card (nvidia, ati/amd, intel), you've tagged 11.10, but did this work on 11.04 (if you tried it), is a 32-bit or 64-bit installation?

[david6]

If you have you an older Intel GPU (embedded graphics) and are using Unity-2D, then duplicate of: askubuntu.com/questions/72692/…

[Jorge Castro]

This question should instead be filed as a bug report, thanks! Instructions here.

[Marc Couture]

The display freeze when it wake up. The mouse or keyboard don't freeze, only display. I tried one my one, two different screen and same result. So the problem don't come from the screen.

[Clysthène]

So ! After further tests, Unity is guilty ! When I log on with Gnome, and put the computer on sleep, it wakes up nicely... Let's wait for an update. :(

[Clysthène]

Here's a dirty solution : when jammed, connect into a terminal (Ctrl+Alt+F1 for instance) then type "unity --replace", once the process stops, return to the environment (Ctrl+Alt+F7) then logout (there won't be any confirmation dialog so type Enter to confirm) then re-log, you're settled without reboot !

[david6]

Which graphics chip? Are you using Unity or Unity-2D ?