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I've got eOS (0.4.1 Loki) on my Desktop and Laptop at this time. On my Laptop when I leave it open for some time it goes to a stage like sleep, only I can't recover it. I am seeing a white underscore on the top right corner of the screen.

I've tried all kind of schortcuts but nothing works. I can recover only if I hard close the system from the power button or sometimes if i press it once and go to sleep. Then I re open it and everything works fine.

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This really might depend on what specific laptop you have and if you have TLP or the like (laptop tools etc) installed.

Here is an example of tlp causing this issue and the solution for a specific acer laptop. https://bbs.archlinux.org/viewtopic.php?id=224098

If you have powertop installed, you can can go through all of the various power state options. Disabling and enabling them individually while checking the sleep state until you find the specific hardware flag that is causing the hang.

Here are some other general tips: https://01.org/blogs/rzhang/2015/best-practice-debug-linux-suspend/hibernate-issues

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