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I'm kinda new to ubuntu, and I have an HP Envy 14-2020nr. The computer has hybrid graphics, and since Ubuntu doesn't yet handle them very well I've been using vga_switcheroo to disable the discrete graphics card (AMD Radeon HD 6600M Series) at boot. Anyways with the discrete graphics card disabled if i suspend my computer, when i wake it back up the computer's fan goes to maximum and won't stop until I restart.

How can I go about fixing this so I can use the suspend without having to restart afterwards? I have tried turning back on the discrete graphics card before suspending and that seems to work. So is there a way to get my computer to turn it on before suspending, but then turning it back off when it resumes? Any ways at solving this would be much appreciated. Thanks.

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Anyone? I really need someway of either automatically turning on discrete graphics before suspending, or some other way of getting suspending to work. – syst3mfailur3 Oct 26 '11 at 0:57
probably include the "echo ON ..." in one of the scripts for suspending etc., I do not know which ones would be best. For example, I use a script in /etc/rc6.d/ and /etc/rc0.d/ to turn the card on for shutdown/logout etc. Have a read through this: – marto Oct 26 '11 at 1:41
+1 for "How do I stop my fans from going crazy...". are you a rock star? – Eliran Malka Oct 23 '12 at 7:06

You can have scripts or commands run automatically before and after suspending. Just create a script in /etc/pm/sleep.d/. It should be named without an extension, like 75ati_toggle. The Arch Linux Wiki has some shows the general convention for naming the scripts (link here). Anyway, the contents of the script could be something like this:

# Script to disable and enable the discrete graphics card before suspend and after resume

case "${1}" in
  # Commands to enable the graphics card before suspend goes here
  # Commands to disable the graphics card after resume goes here

Hope this helps!

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You can also turn it ON and then OFF after waking up.

This is a known bug reported to Ubuntu on launchpad here.

It was reported as well to the Linux kernel at the following link.

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I had a similar problem in a Toshiba A350-22E and what I did was: boot up suspend wake up

simple as that. Then everything worked normal... I hope it helps you.

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