I first noticed this behavior in a newly purchased HP laptop. The login window goes crazy after I log out. The screen moves erratically, often the screen corner icons are in the middle. The only way out of this is a hard reboot.

Initially, I thought that this has something to do with the laptop hardware and I was about complain to the supplier. However, after a couple of weeks, another newly procured laptop showed the same behavior.

Some facts/observations.

  1. This occurs only at random, without any detectable pattern. The event can not be called to be predictable or always reproducible.
  2. This does not occur in case of Windows 8.1. The first laptop has Ubuntu only, the second one is dual boot.
  3. Both the laptops are running Ubuntu 15.04, upgraded to the latest version.
  4. The movements are more in the horizontal direction rather than in the vertical direction.
  5. The two laptops have different graphics cards. One has a built in card, the other one has a separate Nvidia card using a proprietary driver.

Could you please tell me how do I find a remedy to the situation?


More informatin on graphics and display.

Laptop 1: Intel HD Graphics 5500 (Broadwell GT2). 14.0-inch diagonal LED-backlit display. Using default 1366X768 resolution.

Laptop 2: Intel HD Graphics 5500, NVIDIA GeForce 840M (2 GB DDR3 dedicated). 15.6-inch diagonal HD BrightView WLED-backlit. Using default 1366X768 resolution. Installed the Ubuntu offered proprietary graphics driver.

  • Could you please provide some information about your graphics hardware - the more detailed the better.
    – cl-netbox
    Sep 10 '15 at 9:40
  • @cl-netbox Updated the question. Thanks.
    – Masroor
    Sep 10 '15 at 11:33
  • What is the maximum display resolution you can set on each laptop ?
    – cl-netbox
    Sep 11 '15 at 9:28
  • The maximum resolution that can be set is 1366X768, and that has been set by default (in both the cases).
    – Masroor
    Sep 11 '15 at 16:50
  • @Masroor - Is this incident with display happening too, when you are NOT logged into internet ?! Which nvidia-driver is installed - there is a different driver which you could test too. Sep 16 '15 at 6:11

As you have quite new GPU hardware it might possibly be some kind of driver issue.

While intel chips are very well supported, there is actually nothing to do right now.

We may come to this later, but to sort things out - let us start with laptop 2 first.

Install the latest stable NVIDIA driver and Optimus support :

sudo add-apt-repository ppa:graphics-drivers/ppa
sudo apt-get update
sudo apt-get install nvidia-355 nvidia-prime
sudo reboot  

Update :

Sorted out a lot of possibilities, it looks like it might be a kernel related compatibility problem.

Download the daily (test) build of the coming Ubuntu edition 15.10 with the newer kernel 4.2 :


Create an install media - boot from it to check.

Conclusion :

The problem does not occur on ubuntu 15.10.

Install it immediately or wait for final release.

Ubuntu 15.10 will be released on October, 22.

  • The nvidia driver got upgraded from version 346 to version 355 in the second laptop. The problem is not solved. Perhaps it has become worse.
    – Masroor
    Sep 11 '15 at 9:17
  • Just to be sure - did you switch to NVIDIA (NVIDIA X Server Settings -> PRIME Profiles), then performed logout and back in to use NVIDIA graphics ?
    – cl-netbox
    Sep 11 '15 at 9:51
  • I can not locate the `NVIDIA X Server Settings -> PRIME Profiles', so can not confirm on that. However, this image should substantiate that I am indeed using the latest nvidia driver. Please let me know if anything is missing.
    – Masroor
    Sep 12 '15 at 2:47
  • By `becoming worse', I wanted to mean that now the display is showing the additional symptom of going blank, coming back to the erratic motion (previously present) and then going blank again. Previously, you could at least get your coordinates, though the hard way. Now, you can not even see what is happening when you press a button.
    – Masroor
    Sep 12 '15 at 3:53
  • The screenshot only shows that you have NVIDIA driver 355.11 installed, not that you are actually using it. To access NVIDIA X Server Settings open the dash, type 'NVIDIA' and open settings application. Then go to 'PRIME Profiles', switch to NVIDIA, log out and back in.
    – cl-netbox
    Sep 12 '15 at 7:30

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