U2413, firmware updates, issue with multiple inputs

Question

6 year old U2413 and have had this issue for a long time, but now I finally take a moment to see if there's a solution. This monitor is connected to two PC's: one permanently (a Precision 5530 via DP->miniDP on TB16 Dock) and one intermittently (a Windows10 tablet PC using HDMI (miniDP on the tablet PC -> HDMI input of the U2413) The issue is that most of the time, if the Precision 5530 is connected but turned OFF, when I boot the Tablet PC, the U2413 doesn't not wake up (but there is definitely a valid signal on the HDMI cable coming from the Tablet PC); manual or automatic source scan doesn't help; turning off/on the U2413 doesn't help either; the workaround is to physically disconnect the Precision 5530 DP cable before attempting to boot or connect the Tablet PC. Conversely if I boot or connect the Tablet PC (HDMI) when the Precision 5530 is running and connected (DP), there is no problem, I can switch between the DP and the HDMI sources without problem. I wonder why the U2413 fails to recognize a valid HDMI input when a turned off PC is connected on the DP port? Bug? Is there a Firmware update for the U2413?

DELL-Chris M · Answer

You can see here on the out of warranty U2413 driver page that Dell never posted any firmware updates.

I would remove the TB16 dock from the troubleshooting scenario. You could connect like this and see if the U2413 input switching works =

Precision 5530 HDMI out port --> HDMI to HDMI cable --> U2413 HDMI in port
Tablet PC mDP out port --> U2413 mDP to DP cable --> U2413 DP in port

For review and further testing WITH the TB16, read through these TB16 documents =
How to Use and Troubleshoot the TB16
TB16 Driver Installation Guide

benoitm · Answer

To be complete, I should then say that I had the same problem with the previous configuration, where the "non permanent" computer was the same Tablet PC connected via HDMI, but the "permanent" PC was a Precision M4700 with Docking station (not a TB16) connected to the U2413's miniDP port.

The symptom was the same: if the Tablet PC/HDMI was booted with the M4700/miniDP turned OFF, the U2413 would not wake up. Only physically disconnecting the M4700 to let the Tablet PC boot and the U2413 wake up would help (or boot the M4700 first).

So we can safely assume the TB16 isn't the culprit.

I'd say that an obscure bug in the U2413 makes it 'refuse' recognizing a valid HDMI connection when a powered off device is connected via DP or miniDP, probably with some other factors that I haven't been able to isolate.

Monitors

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