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I'm having a problem with cursor movement on my laptop. Whenever I hold down a key and move my USB mouse simultaneously, this happens.
Normally this wouldn't be much of an issue, but unfortunately it makes most video games unplayable. The behavior occurs with both built-in keyboard and USB keyboard, but does not occur with the trackpad. I have tried using a different mouse but the behavior stayed the same.
I am currently running Ubuntu 15.04 on a MacBook Pro.

Any help would be greatly appreciated!

The output from lshw -c video:

  *-display               
       description: VGA compatible controller
       product: 3rd Gen Core processor Graphics Controller
       vendor: Intel Corporation
       physical id: 2
       bus info: pci@0000:00:02.0
       version: 09
       width: 64 bits
       clock: 33MHz
       capabilities: msi pm vga_controller bus_master cap_list rom
       configuration: driver=i915 latency=0
       resources: irq:35 memory:a0000000-a03fffff memory:90000000-9fffffff ioport:2000(size=64)
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What graphics chip (brand/model) and which driver for it do you use? Best edit your question, adding the output of sudo lshw -c video. – s3lph Jul 5 '15 at 17:56
    
@the_Seppi my video card is "Intel® Ivybridge Mobile" – John Jul 5 '15 at 21:16
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Removing the mouseemu package solved the issue.

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