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Asked: 2015-07-08 07:05:37 +0800 CST

Lubuntu shutdown process freezes

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I'm using Lubuntu 15.04 on a Lenovo Essential B50-30, a low-end machine. When I shut it down, after a few seconds (during which you can see the Lubuntu logo and "....") the screen just gets stuck on that screenshot (the colored dots not moving anymore), and I have to long press the power button to make it turn off. Am I damaging my pc? (Not really sure if the process is completed or the processor's still working) Are you aware of any possible solution?

lubuntu

2 Answers

  1. Just BIOS update didn't fix the issue. After pretty much googling and rebooting finally found solution.

    1. In BIOS setup choose Wndows 8 x64 at very last menu (Other OS item doesn't work).
    2. Load defaults for it.
    3. Disable secure boot in security menu.

    4. Boot linux and edit kernel parameters in /etc/default/grub file it should be:

      quiet splash reboot=warm,acpi i915.invert_brightness=1

      Invert is needed as with win8 defaults brightness buttons behave vice versa.

    5. sudo update-grub.

    Thats it! Shutdown and reboot work as it should, even lid puts laptop to sleep mode. This solution should work for other laptops too with maybe only other reboot params. It could be one of: bios, acpi, efi, triple, pci, kbd. reboot=pci does also work, but it does cold reboot - power down then power up after 3 sec.

    Hope this post will help someone :)

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  2. Best Answer

    Look at my post in Ubuntuforums (ragb1).

    You have to update the bios (from Windows, no other way). After you can make a clean shutdown.

    Hope it helps

    ==========================

    The problem was a bug in the BIOS/UEFI firmware (my laptop was using v. 2.08). You have to update the firmware (Windows mandatory for this step) up to the final release (v. 2.11 at this point). After that, you can finally make a clean shutdown.

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