External Monitor (Samsung M7) Flickers Only on Ubuntu 22.04 — Works Fine on Windows

[tkddus21]

Subject: External Monitor (Samsung M7S32DM701) Flickers Only on Ubuntu 22.04 — Works Fine on Windows

Post content:

Hi everyone,

I'm experiencing a frustrating issue with my external monitor setup.

I have a dual-boot system (Windows 11 and Ubuntu 22.04.4 LTS) on the same laptop. The laptop has Intel integrated graphics (i915 driver), and I'm connecting a Samsung Smart Monitor M7 via HDMI.

The issue is:

• On Ubuntu, the external M7 monitor flickers randomly — it briefly goes black for about 0.2 seconds and then comes back.

• This happens more frequently when I move the mouse quickly, which suggests it's related to screen updates or GPU activity.

• On Windows 11, everything works perfectly. No flickering at all.

• I also tested a different monitor (a basic one from another brand) under the same Ubuntu setup, and it worked fine — no flickering.

I suspect it has something to do with Ubuntu's i915 driver, power-saving features like PSR, or compatibility with HDMI UHD Color / HDR features of the M7.

What I’ve tried so far:

• Disabled PSR by adding i915.enable_psr=0 to GRUB and running update-grub

• Switched from Wayland to Xorg

• Forced refresh rate using xrandr --rate 60.00

• Disabled HDMI UHD Color, HDR+, and Auto Input Detection from the M7 monitor settings

• Installed xserver-xorg-video-intel

• All without success — the flickering persists

Has anyone encountered this issue with a smart monitor like the M7?
Any ideas or kernel/module tweaks that might help?

Thanks in advance!

[Samsung_Moderator · Accepted solution]

Hello! Thank you for reaching out! This will be a compatibility issue with Linux. As you do have to install some drivers yourself. Unfortunately, I would be unable to assist with driver downloads for Linux, as we are only able to offer help with Windows/ I would recommend going to a forum that helps with Linux based issues for further support.