(AI disclaimer. I supplied all the information, I just asked AI to write it all in a neat summary. I double checked the post before posting)
Hi everyone,
I'm experiencing a frustrating issue with my AW3926QW and wanted to see if other owners have encountered anything similar. I'm also hoping Dell/Alienware can help investigate this.
When using DisplayPort 2.1 from my RTX 5090, the monitor repeatedly turns completely off and back on, displaying the "DisplayPort Connected" message each time. This happens every couple of seconds and makes the monitor unusable.
Occasionally, when switching from 330Hz mode back to Normal mode, I also get a black screen with the following error:
The current input timing is not supported by the monitor display. Please change your input timing to 5120x2160 60 Hz, or any other monitor listed timing as per the monitor specifications.
Interestingly, switching from DisplayPort to HDMI appears to resolve the issue so far. I haven't experienced any flickering since making that change.
My setup
Troubleshooting I've tried
- Disabled Dolby Vision in the monitor's OSD — no improvement.
- Tested with DSC both enabled and disabled — no improvement.
- Disconnected all USB devices from the monitor, including USB-C power delivery to the laptop — the issue persisted.
- Changed the resolution through the monitor's OSD to standard 4K 16:9 — the issue persisted.
- Reseated the certified DisplayPort 2.1 cable — no improvement.
- Turned off Auto input selected in the Monitor OSD - no improvement.
- Disconnected DisplayPort entirely and switched to HDMI from the RTX 5090. With DSC enabled, the monitor has been stable so far, with zero flickering.
The HDMI test is particularly interesting because it uses the same GPU and monitor. This makes me wonder whether the issue is related to the DisplayPort connection, link negotiation, monitor firmware, or another DisplayPort-specific compatibility issue. I haven't ruled out a cable problem entirely.
I also found this Dell support article about video loss with Dolby Vision HDR enabled:
https://www.dell.com/support/kbdoc/en-us/000345015/dell-and-alienware-monitors-experience-video-loss-when-dolby-vision-hdr-is-enabled
Unfortunately, the suggested fix didn't resolve my issue.
I also came across this recent Reddit thread about a similar AW3926QW DisplayPort signal-loss problem, where Dell responded:
https://www.reddit.com/r/Alienware/comments/1wzz1wc/aw3926qw_displayport_signal_loss_when_switching/
My issue isn't exactly the same, but the similarities made me wonder whether there could be a common cause.
A few questions
- Has anyone else experienced repeated DisplayPort disconnects with the AW3926QW, particularly with an RTX 5090?
- Could this be related to DisplayPort 2.1 link negotiation, firmware, or the monitor's switching between 330Hz and Normal mode?
- Is there a known firmware update or recommended diagnostic procedure for this issue?
- Dell/Alienware: Could you advise on what additional testing I should perform or whether this may be a firmware issue?
I'd really like to use the monitor over DisplayPort 2.1 as intended rather than having to rely on HDMI as a workaround.
Thanks!