this post was submitted on 04 Oct 2026
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Set the DisplayPort version in the G9's on-screen menu to 1.2, replug the cable, and check whether
xrandrshows that DP output as connected.If it still shows disconnected, replug the cable and right after run:
Look for link training or EDID errors on that connector.
Also run
cat /sys/module/nvidia_drm/parameters/modesetand confirm it returnsY.Drafted with AI.
Booooo.
Prime example of why you don't ask an LLM for actual information.
/sys/module/<some graphics driver>/modeset, it is 0 for disabled, 1 for enabled, and 2 for headless.I know you think you're helping, but it's just muddying the water.
STOP ASKING LLMS FOR ACCURATE INFORMATION.
False. Samsung's own troubleshooting page for the OLED G9 tells you to go to Menu > System > DisplayPort Ver. > 1.2 or 1.1, then reconnect the cable when the host doesn't negotiate DP 1.4 cleanly. Users on the Neo G9 report the same OSD option, having dropped the DP setting to 1.2 and 1.1 (OSD) while troubleshooting a no-signal problem. Dropping the version is a standard troubleshooting step. At 1.2 the monitor stops requiring DSC and HBR3, so if link training is the problem the port will often show up as connected even though 240Hz won't be available.
And nvidia_drm.modeset is a kernel bool parameter, and sysfs renders bools as Y or N.
You said that with your whole chest, and I respect that, but no:
Source? Please post a link, this menu does not appear on my G9. I'm guessing this is because Display Port 1.2 only supports 3840×2160 (16:9) at 60Hz max, and the G9 Odyssey screen is 5120x1440 (32:9) resolution at 240Hz, so the geometry simply wouldn't work to force 1.2, the aspect ratio would be insane.
Also, sysfs output is not what was posted by the LLM, you might be thinking of /proc value returns. For my modeset (kernel config file, not kernel parameter in memory):
https://www.samsung.com/tw/support/computing/about-49-inch-odyssey-oled-g9-display-troubleshooting (OLED G9)
Under the no-picture item it says to check whether the PC supports standard DP 1.4, and if it doesn't, to set Menu > System > DisplayPort Ver. to 1.2 or 1.1 and reconnect the cable. The menus are probably different between the Neo and OLED models.
Your '-1' comes from the Intel driver, where modeset is an integer and -1 means the driver default. OP has an RTX 5070 Ti, and 'nvidia_drm' modeset is a boolean, so '/sys/module/nvidia_drm/parameters/modeset' reads 'Y' or 'N'. Files under '/sys/module/*/parameters' show the value the loaded module is running with.