Flickering, graphics corruption, and loss of signal with Nvidia 4090 and 5K2K screen (LG 45GX950A-B.AUS)

Graphics / Linux Linux
1

I recently purchased an LG 45GX950A-B.AUS monitor and the Nvidia Linux drivers, at least with the 4090, seem to have some trouble with it. I’m encountering two main issues:

  1. When connected via DisplayPort (1.4), the native resolution and refresh rate is detected (5120x2160@165Hz), but there’s very noticeable flickering and graphics corruption on the bottom right portion of the screen.

    I’m unsure if this is related to DSC. Toggling VRR and HDR make no difference, but dropping the refresh rate down to 100Hz or 60Hz seems to prevent the issue from occurring.

    This is what the issue looks like: https://youtu.be/j-DoxsEJdkE
    Bug report with 575.51.02 proprietary drivers (GSP disabled): nvidia-bug-report.log.575.51.02_displayport_proprietary_no_gsp.gz (1.5 MB)
    Bug report with 575.51.02 open drivers: nvidia-bug-report.log.575.51.02_displayport_open.gz (531.7 KB)

    (The same issue occurs with 570.133.07 as well.)

  2. When connected to HDMI 2.1, the display defaults to only 3440x1440@85Hz, but the monitor constantly pops up an “Out of Range” warning and says that the input is 17Hz. This already starts to occur during boot before the login screen or desktop environment is loaded.

    When setting the resolution to 5120x2160@165Hz, the monitor is unable to get a signal at all. 60Hz and 100Hz seem to always work.

    Bug report with 575.51.02 open drivers and 3440x1440@17Hz: nvidia-bug-report.log.575.51.02_hdmi_3440x1440@17Hz.gz (623.0 KB)
    Bug report with 575.51.02 open drivers and 5120x2160@165Hz (captured over SSH because monitor has no signal): nvidia-bug-report.log.575.51.02_hdmi_5120x2160@165Hz.gz (671.4 KB)

With the same hardware on Windows (576.02), neither issue occurs.

2

I’ve also filed a kwin bug report for the flickering (when using DP 1.4). I don’t know if the root cause is in the Nvidia drivers or in kwin, but I did find that it stops happening when I change the color accuracy setting from Prefer efficiency to Prefer color accuracy.

3

I can reproduce issue 2 on my 5090 but not issue 1, even though I have the same monitor.

1 Like
4

I have the exact same issues RTX4080 + LG 45GX950: Artifacts with DP + 165hz not working with HDMI 2.1 - #2 by YetAnotherUsername

5

I have filed below 2 bugs for tracking purpose. Shall attempt for local repro and get back to you if required any additional information.

5301317 Flickering and graphics corruption with Nvidia 4090 and 5120x2160@165Hz screen (LG 45GX950A-B.AUS) with driver 570.133.07
5301333 Loss of signal with Nvidia 4090 and 5120x2160@165Hz screen (LG 45GX950A-B.AUS) with driver 570.133.07

1 Like
6

Hi All,
We have below updates on the following bugs.

5301317 Flickering and graphics corruption with Nvidia 4090 and 5120x2160@165Hz screen (LG 45GX950A-B.AUS) with driver 570.133.07

Status Update: We do have inhouse repro but all of sudden not seeing such issue on repro setup, could someone please verify from your end and update.

5301333 Loss of signal with Nvidia 4090 and 5120x2160@165Hz screen (LG 45GX950A-B.AUS) with driver 570.133.07
Status Update: We have local repro for it and engineering team has root caused the issue. Fix will be available in future releases.

7

Thank you very much!

Unfortunately, I can no longer help test 5301317 because I returned the monitor. Hopefully other folks here can help test that.

8

I also have the flicker problem (KDE 6.3.6 Wayland VRR 5120x1440 240 Hz) with the Samsung Odyssey G9 Neo via DisplayPort and driver 575.64.5. The lower right half of the screen flickers, especially when Firefox has a Twitch PiP window open and the PiP window is on the right side and the Firefox window on the left side.