I bought a Dell Inspiron 14 5000 series and dual booted Windows 8.1 and Ubuntu GNOME 14.04. The brightness would not change, so I booted with kernel parameter acpi_backlight=vendor and it worked. I later had to return that specific unit because of a hardware defect for another one.

With the second (current) unit I installed just regular Ubuntu 14.04. I tried to use the kernel parameter acpi_backlight=vendor with it, but with quiet splash acpi_backlight=vendor all it gave me was a black screen. I booted without quiet splash and it froze at allocating swap space.

Why is it refusing to boot?

I also tried adding acpi_osi=Linux to acpi_backlight=vendor. Still wouldn't boot. acpi_osi=Linux on its own does not have any effect.

  • What is the exact output on the screen at this point: "I booted without quiet splash and it froze at allocating swap space." ? – amanthethy Aug 7 '14 at 2:25
  • Is it relevant? It was a message about allocating ~ 8 gb of swap space (I have 8 gb of RAM) and then it froze – Aristides Aug 8 '14 at 14:25
  • It's relevant because that's where it froze. This could be completely unrelated to your card and/or the swap. Chances are the clue is in whatever messages are on the screen. Add a verbose paramater so you can see everything that's happening at boot and then post a picture here and maybe someone will figure it out. – amanthethy Aug 8 '14 at 21:37

This happened to me once and I found an answer here: How do I adjust the screen brightness on an Acer Aspire One D270?

It was about brightness issues and this fixed it for me:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux i915.i915_enable_rc6=1"

There are a lot of other parameters suggested as well.

  • Did not do anything. – Aristides Aug 7 '14 at 1:37

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