To fix high CPU usage caused by graphic driver

[kukamuumuka]

Hardware acceleration can cause high CPU usage with some graphic drivers. Usually this can happen on an old computer and driver like savage.

1. Make a /etc/X11/xorg.conf file

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sudo Xorg :1 -configure

PS. Ignore the error messages

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sudo cp xorg.conf.new /etc/X11/xorg.conf

2. Edit the /etc/X11/xorg.conf file

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sudo nano /etc/X11/xorg.conf

... add the next line to the device section

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 Option   "NoAccel" "True"

... save, quit and reboot
Ctrl o
Ctrl x
An example about whole section:

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Section "Device"
        Option      "NoAccel" "True"
	Identifier  "Card0"
	Driver      "intel"
	BusID       "PCI:0:2:0"
EndSection

Edit: With Mint 18 and Debian 9 the option is

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 Option     "Accel"  "False"

Also DRI options is good to be False.

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  Option     "DRI3"    "False"
  Option     "DRI"    "False"