I have recently switched to Ubuntu and my screen flickers when I watch videos. I have searched the forum a lot, tried the Intel graphics tool, modified the grub file and it's still flickering. I have read that some bug associated with Intel graphics got fixed in kernel version 4.10 and up so I don't know what the problem is. My laptop is a Dell Latitude 7280, i7, Graphics: Intel HD Graphics 620 (Kaby Lake GT2), Ubuntu 16.04 and kernel version 4.13 Also, I tried connecting to a different screen with HDMI and it flickers there too. Thanks.
I had been experiencing the same problem with my Dell Vostro 5370 and Ubuntu 16.04 LTS.
This is how I solved it:
- Go to "Software & Updates" application
- Under "Additional Drivers" tab, you should find "Intel Corporation: Unknown" section.
- Choose "Do not use the device"
Because DKMS will "pollute" your kernel until you purge the kernel using apt-get. The way I did is:
- reboot to an older working kernel (to choose different kernel in boot menu, you might want to check out How to get to the GRUB menu at boot-time?)
$ dpkg -l | grep linux-imageto check what kernel you have installed
- use similar commands to
# apt-get purge linux-image-4.4.0-73-generic linux-image-extra-4.4.0-73-genericto purge linux completely
- install latest kernel back by version if you wish:
# apt-get install linux-image-extra-4.4.0-116-generic
- Reboot your computer and good luck!
If you are not so lucky that you have a functional kernel, you would probably either work under the flicker screen or use the old console without GUI.