18.04: Fixing video lag

Question

I just bought a dirt cheap PC, installed Ubuntu 18.04,and want to use it for the living room TV.

The problem is when running YouTube videos with lots of action, it seems like the stop half of the screen is lagging behind the bottom part of the screen by just a fraction of a second. It is annoying to watch, so I want to know if you folks had some possible solutions.

A) The lag doesnt go away. B) no only firefox, where i play it. C) i am using youtube to play it. product: SVE1513Q1ESI (54527900) *-display 00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09) (prog-if 00 [VGA controller]) Subsystem: Sony Corporation 3rd Gen Core processor Graphics Controller Flags: bus master, fast devsel, latency 0, IRQ 32 Memory at c0000000 (64-bit, non-prefetchable) [size=4M] Memory at b0000000 (64-bit, prefetchable) [size=256M] I/O ports at 3000 [size=64] [virtual] Expansion ROM at 000c0000 [disabled] [size=128K] Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit- Capabilities: [d0] Power Management version 2 Capabilities: [a4] PCI Advanced Features Kernel driver in use: i915 Kernel modules: i915

A) When you downsize the Youtube window to progressively smaller windows, does the lag go away? B) Are you running anything else at the same time? C) Are you using VLC or some other app to play the video? D) Please run sudo lshw | grep product | head -n1 && sudo lshw | grep display && sudo lspci -v -s $(lspci | grep ' VGA ' | cut -d" " -f 1) , highlight the resulting text, copy the text with Ctrl-Shift-C then return here, click [edit], and paste the result in the question so we can see what video you have. You may need to add a video card, but let's see what you have. — K7AAY, Apr 27 '20 at 18:51
Does this answer your question? How do I find out which version and derivative of Ubuntu is right for my hardware in terms of minimal system requirements? — karel, Apr 30 '20 at 06:28
A) The lag doesnt go away. B) no ony firefox, where i play it. C) i am using youtube to play it. — Jakob Ravn, May 22 '20 at 16:24

18.04: Fixing video lag

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