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I recently installed 17.04 on my desktop PC. Due to some technical constraints (I have a dual monitor setup and one them has only VGA adapter), I have to use both my RX480(primary monitor) and Intel HD4600. While RX480 has no problems whatsoever, I am seeing blocky tears/tearing on my monitor on HD4600.

I tried the following:

Tear-free disabled in Intel Graphics, tearing in Xubuntu

https://ubuntuforums.org/archive/index.php/t-2344312.html

http://www.apolitech.com/2016/01/how-to-solve-video-tearing-on-intel.html

But to make matters worse, after adding the xorg.conf to /etc/X11

or alternatively 20-intel.conf to /usr/share/X11/xorg.conf.d

with the parameters

Section "Device"

Identifier "Intel Graphics"

Driver "intel"

Option "AccelMethod" "sna"

Option "TearFree" "true"

EndSection

I was stuck with the message on boot:

"/dev/sda1: clean, 121563/920272 files, 701079/3680256 blocks"

Adding GRUB parameter "nomodeset" disabled HD4600 and dropped the resolution on primary monitor to 800x600.

Am I doing something wrong? If not, what else I can do? Any kind of help is appreciated.

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Try adding i915.enable_rc6=0 to your boot parameter. This should fix the tearing. But it will disable an important power management module resulting in excessive fan use.

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