# No displayport signal after boot when monitor was off **URL:** \ **Category:** Kernel, boot, graphics & hardware\ **Created:** [May 9, 2025, 8:31pm UTC](https://forum.endeavouros.com/t/no-displayport-signal-after-boot-when-monitor-was-off/71171 "2025-05-09T20:31:08Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![mbod](https://forum.endeavouros.com/user_avatar/forum.endeavouros.com/mbod/32/16833_2.png) [@mbod](https://forum.endeavouros.com/u/mbod)\ **Post date:** [May 9, 2025, 8:31pm UTC](https://forum.endeavouros.com/t/no-displayport-signal-after-boot-when-monitor-was-off/71171/1 "2025-05-09T20:31:08Z")
Hi, I have two monitors connected to my AMD RX 6650 XT. Both monitors with DisplayPort. When I boot the PC with the monitors being off, the DisplayPort will not have any signal when I turn the monitors on after boot. The monitors complain about “no DP signal” and stay dark. I can not recover from that situation. Regardless which keys I press, the monitors stay dark with no signal. I have to do a REISUB to reboot the PC to recover from that. The problem does no occur if the main monitor is on HDMI. So it has to do with DisplayPort. I wonder if anybody here experiences the same issue or might even have a solution for that. ---
**Author:** ![petsam](https://forum.endeavouros.com/user_avatar/forum.endeavouros.com/petsam/32/41308_2.png) [@petsam](https://forum.endeavouros.com/u/petsam)\ **Post date:** [May 12, 2025, 10:35pm UTC](https://forum.endeavouros.com/t/no-displayport-signal-after-boot-when-monitor-was-off/71171/2 "2025-05-12T22:35:43Z")
> [@mbod](#): > > I have to do a REISUB to reboot the PC to recover from that. You can try restarting X. For a standard case, Ctrl-Alt + F3 (give it 5 secs) and back. No DM, or which DM? Look in DM logs and the journal. I had a similar case today (with AMD integr). I have LightDM with a setup script with debug output logging. A VGA output (FullHD), which is treated/named as DM-1, and an HDMI monitor/output. Boot with no power on the monitors. After power on, no signal to both. After swapping TTYs and LightDM restart: VGA (primary) had failsafe resolution (1024x768) with LightDM login box. HDMI no signal. After login to BSPWM session, my randr script provided successful/expected outputs. In case this is related to kernels, I suggest testing a fallback image. ---
**Author:** ![mbod](https://forum.endeavouros.com/user_avatar/forum.endeavouros.com/mbod/32/16833_2.png) [@mbod](https://forum.endeavouros.com/u/mbod)\ **Post date:** [May 13, 2025, 5:04am UTC](https://forum.endeavouros.com/t/no-displayport-signal-after-boot-when-monitor-was-off/71171/3 "2025-05-13T05:04:19Z")
> [@petsam](#): > > You can try restarting X I am using gdm / gnome with wayland. Going back and forth between different consoles (cntrl-alt-F3 / cntrl-alt-F1) did not help. ---
**Author:** ![petsam](https://forum.endeavouros.com/user_avatar/forum.endeavouros.com/petsam/32/41308_2.png) [@petsam](https://forum.endeavouros.com/u/petsam)\ **Post date:** [May 13, 2025, 5:07pm UTC](https://forum.endeavouros.com/t/no-displayport-signal-after-boot-when-monitor-was-off/71171/4 "2025-05-13T17:07:40Z")
> [@petsam](#): > > Look in DM logs and the journal. GDM logs are inside the journal. ---
**Author:** ![mbod](https://forum.endeavouros.com/user_avatar/forum.endeavouros.com/mbod/32/16833_2.png) [@mbod](https://forum.endeavouros.com/u/mbod)\ **Post date:** [May 14, 2025, 7:18am UTC](https://forum.endeavouros.com/t/no-displayport-signal-after-boot-when-monitor-was-off/71171/5 "2025-05-14T07:18:32Z")
It is solved! My main monitor is a Dell U2724DE. When I visited the Dell website to eventually find a hint if the problem is related to the monitor I found a firmware upgrade. Until that point I didnt even know that a monitor can receive a firmware upgrade. Luckily Dell supports Linux to install firmware for their monitors. Unfortunately only Ubuntu. I installed the recommended Ubuntu 20.04 LTS on a USB drive, installed the Dell firmware software on top and did the upgrade. Firmware version went from M3T103 to M3T105. And my problem with the Displayport is gone! ---
**Author:** ![system](https://forum.endeavouros.com/uploads/default/original/2X/9/9ea52f9fd5ef8e609e593c362d61a36295f48be8.png) [@system](https://forum.endeavouros.com/u/system)\ **Post date:** [May 16, 2025, 7:19am UTC](https://forum.endeavouros.com/t/no-displayport-signal-after-boot-when-monitor-was-off/71171/6 "2025-05-16T07:19:07Z")
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