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Linux Cinnamon: HDMI Video Plays at Double-Speed
Seems like this is a known problem with AMD cards. This fix assumes you have an AMD card.
First, edit /etc/default/grub and change this line:
to this line
GRUB_CMDLINE_LINUX_DEFAULT=”quiet splash radeon.audio=1″
Now run “sudo update-grub“, then reboot your computer.
Next, change the driver in the Driver Manager from the recommended x-server x.org driver to the AMD fglrx driver. Again, reboot.