Flickering on RPI 4b

[Meowcat285]

Describe the bug or issue
A clear and concise description of what the bug is.

Describe your setup

• Your Raspberry Pi model and spec variant, e.g. 4B with 2GB RAM
• Your Chromium OS for Raspberry Pi release version, e.g. Chromium OS r77 r3
• Your hardware configuration and setup, e.g. how you have wired the Pi board with any other peripheral connected to it

Raspberry Pi 4B with 4 GB of RAM
Chromium os r77 R2

To Reproduce
Steps to reproduce the behavior:

1. Start system
2. Animations flicker

Expected behaviour
Animations are smooth

Screenshots and/or hardware setup photos
If applicable, add screenshots to help explain your problem. If your problem is hardware related, it's much easier to include a photo of how your setup looks like.

N/A
Additional context
Add any other context about the problem here.

N/A

[alphato-o]

We are going to need a bit more information regarding your physical setup, did you use any HDMI converter? What kind of screen? A picture/video demonstrating the flicker would be ideal.

[Meowcat285]

I am not using a converted, it is a LG 1080p display. I saw another issue regarding the same issue from a month or so ago

[LucasFidelis]

I have the same problem with a screen E230t HP without HDMI converter.

[jwnola]

I'm using the latest prebuilt image, and I'm having the same issues where the screen goes black randomly. I'm using a Raspberry Pi 4 and a Dell 27 running at 1920x1080 directly connected with a micro HDMI to HDMI cable. No converter.

[Sewdn]

I'm using the latest prebuilt image as well. Extreme flickering and noisy display on 4K resolution (using a Philips Brilliance 4K screen), without any adapter. Using a micro HDMI to HDMI cable ().
Less flickering, but very frequent blackouts on a (old) LG FullHD screen 1920x1080.

Related to #84

[th0mpy]

Same here, using a HDMI cable directly to the RPi without an adapter. I get a lot of black/blank screens. The cursor is "corrupted" as well. RPi 4 8g model.

[alphato-o]

flickering is now much improved in the r86r1 build, give it a try

[a9udn9u]

For people having the same problem, increase gpu mem solved the issue for me.

Follow this post to mount the boot partition, update config.txt, add gpu_mem=256, reboot.

128MB may also work but I didn't bother trying.

BTW, increase gpu mem also improved Night Light performance by a lot, but it's still laggy.

[Bituvo]

I'm having this issue with my Github Pages website, here
Animations flicker and turn black.

This only happens on my Pi, nowhere else.