[18.3] Screen tearing on both screens

[babidi2]

I get terrible screen tearing on my laptop, even worst when I use my Panasonic TV as a monitor / second monitor. I'm using the intel-microcode 3.2 firmware. Here are my system specs.

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System:    Host: g Kernel: 4.10.0-42-generic x86_64 (64 bit gcc: 5.4.0)
           Desktop: Cinnamon 3.6.7 (Gtk 3.18.9-1ubuntu3.3) dm: lightdm Distro: Linux Mint 18.3 Sylvia
Machine:   System: LENOVO (portable) product: 80UG v: Lenovo ideapad 310-14ISK
           Mobo: LENOVO model: Toronto 4A2 v: SDK0J40688 WIN Bios: LENOVO v: 0XCN37WW date: 10/03/2016
           Chassis: type: 10 v: Lenovo ideapad 310-14ISK
CPU:       Dual core Intel Core i7-6500U (-HT-MCP-) cache: 4096 KB
           flags: (lm nx sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx) bmips: 10368
           clock speeds: min/max: 400/3100 MHz 1: 499 MHz 2: 499 MHz 3: 696 MHz 4: 499 MHz
Graphics:  Card: Intel Sky Lake Integrated Graphics bus-ID: 00:02.0 chip-ID: 8086:1916
           Display Server: X.Org 1.18.4 drivers: intel (unloaded: fbdev,vesa)
           Resolution: 1366x768@59.97hz, 1920x1080@50.00hz
           GLX Renderer: Mesa DRI Intel HD Graphics 520 (Skylake GT2)
           GLX Version: 3.0 Mesa 17.0.7 Direct Rendering: Yes

[thx-1138]

...since this appears to not have any replies yet...Bump!

Microcode has nothing to do with graphics, it's meant for improving / correcting the processor's behavior.
At first, try:

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sudo apt-get remove xserver-xorg-video-intel

Then reboot.

If that doesn't solve it, wait until someone else who is familiar with Cinnamon's internals pops up...
(on a very similar model, 300-17ISK, under Mate, running tear-free by using Compton...)