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possiblylinux127@lemmy.zip

One screen is black with flickering backlight on new AMD GPU (sopuli.xyz)

submitted 2 weeks ago* (last edited 2 weeks ago) by vaionko@sopuli.xyz to c/linuxquestions@lemmy.zip

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I just got a new Radeon RX 6700 XT. I connected my screens to it, and 2 display like they should but mh Asus PG278Q only flickers the backlight. Same problem in text mode, but the UEFI setup shows up fine. In KDE display configuration it doesn't recognise the model, and shows 640x480 as the only supported resolution. Same in my Arch install and live Fedora. I have tried both DP ports on the GPU and different cables. The screen only has a DP port. What more can I try?

Edit: it seems the low resolution text mode grub uses works, but when it switches to the higher res mode the picture goes away

Another edit: same problem with an R9 280 I have. So it seems something about the AMD drivers doesn't like my monitor.

More editing: the older card lets me set the screen to 1024x768 which actually displays. So it seems to be an EDID problem. Now to figure out how to tell KDE what resolutions it supports.

The last edit: I found an EDID file for this monitor online and added it in the kernel command arguments. Monitor works with the full resolution, but only 120Hz instead of the full 144.

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