Samsung QN700B monitor loses 8k resolution (stuck 4k) when reconnected/turned back on, forgets settings

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                          I'm having a problem with a Samsung TV as a monitor. Thank you for any insight:

debian + xorg + RTX4090 + qn700b + (HDMI 2.1 cable seems good)

Problem: when waking the TV and computer, I can't get it back to 8k again? It becomes stuck at 4k.

---

Symptoms:
- Initially, a black screen when TV/computer are turned back on (either order).
- Ctrl-alt-f1/f2/etc wakes screen into 4k, and then I can ctrl-alt-f7 back to graphical tty, but I lost 8k and now it's stuck at 4k (tv correctly still in Samsung game mode).
- sudo nvidia-settings doesn't allow 8k (only 4k appears in dropdown)
- downloading EDID via nvidia-settings and forcing in xorg doesn't work? Not sure how to tell.
- cvt and xrandr --newmode etc / --addmode "HDMI-0" 7680x4320at60 fails with BadMatch (invalid parameter attributes), major opcode 140 RANDR, minor opcode 18 RRAddOutputMode.

(I know I can set Option "DPMS" "false" and various Options "fooTime" "off" in xorg or xset -dpms and keep the monitor on 24/7, or restart the window manager/X/etc as a workaround, but wish to otherwise fix this without losing WM state, without an irreversible firmware update if possible.)

Thank you for any insight!


Xorg.0.log:

    Validated MetaModes: "7680x4320+0+0{AllowGSYNCCompatible=On}"
    ..
    MetaMode "HDMI-0:7680x4320" could not be re-validated against the current hardware configuration; removing.
    ..
    Setting mode "DPY-0:7680x4320+0+0{AllowGSYNCCompatible=On}"
    ..
    Setting mode "DPY-0:nvidia-auto-select+0+0{AllowGSYNCCompatible=On}"


xorg.conf:

    Section "Monitor"
    ..
        Option         "DPMS" "false"
        Option         "PreferredMode" "7680x4320"
    EndSection
    
    Section "Device"
    ..
        Option         "ModeValidation" "AllowNonEdidModes"
    EndSection
    
    Section "Screen"
    ..
        Option         "CustomEDID" "GPU-0.HDMI-0:/path/to/edid.txt"
        Option         "metamodes" "7680x4320 +0+0 {AllowGSYNCCompatible=On}"
        Option         "ConnectToAcpid" "False"  # https://bbs.archlinux.org/viewtopic.php?id=262207 
        SubSection     "Display"
            Virtual     7680 4320
            Depth       24
        EndSubSection
    EndSection


                        

Asked by ninjagecko (199 rep)

Nov 30, 2023, 01:29 PM
Last activity: Oct 22, 2024, 02:01 PM

Samsung QN700B monitor loses 8k resolution (stuck 4k) when reconnected/turned back on, forgets settings

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