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2 Intern
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23 Posts
2
2019
January 14th, 2026 08:36
Docking Station not waking up external monitors
I have around 30 users affected by this, and it probably started happening around November.
We have a mixture of latitudes with WD19S and precisions with wd19dcs. always plugged in with power.
The only power saving option configured in windows is to turn off the screen after 15 minutes, sleep/turn off hard disk are both disabled.
When these users leave their desk for more than 15 minutes and return, their screens do not turn back on, just stay black. For some of them, the laptop screen will come on but the externals will not. For others, non of the screens come on at all.
sometimes disconnecting USB-C cable and reconnecting works, but most times they need to remove power from the dock (neither is an acceptable solution). Disabling the screen off after 15 mins is not a solution either. This should work, and does for 200+ other devices of exact same spec.
Here is what i have tried
- Ran Dell Command Update and all device drivers are up to date
- Ensured bios is up to date
- Ensured dock firmware is up to date (only just released 6th January)
- Wake from USB-C is enabled in bios
If i look at power data of the dock in device manager, i get the below. I don't know much about this, but what I am reading into is that power state S0 is fully on, S5 is off and everything in between is different levels of power saving.
Under power state mappings, S0 maps to D0, everything else (assuming my display turning off is S1 or S2) maps to D3.... and the device does have PDCAP_WAKE_FROM_D3_SUPPORTED. i could be completely wrong?
I tried calling Dell support as they are all under warranty, but installing Dell bloatware (power manager?) is not an option and they just said to reinstall windows, again, not a solution
Thanks
DELL-Nat M
Community Manager
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January 29th, 2026 14:33
Hi everyone,
For Latitude systems, please contact Dell Technical Support. You can do this by clicking Get Help Now (icon in the bottom-right corner of this page). Have your Service Tag ready and follow the virtual assistant prompts until you are connected with an agent.
Dell Pro Max 14 Premium (MA14250) and Dell Pro Max 16 Premium (MA16250):
Dell Pro Max 16 Plus (MB16250) and Dell Pro Max 18 Plus (MB18250)
AlexInnes
2 Intern
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23 Posts
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January 15th, 2026 07:11
@DELL-Jesse L Hi there are a few varieties, but mostly Latitude 5540 connected to P2421 - P2425H screens
AlexInnes
2 Intern
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23 Posts
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January 15th, 2026 07:15
@eobiont2 Sounds about right. All we have is P24X range of monitors.
Are you thinking dock updates, or the laptop updates in general? We only use dell command update, manual updates are blocked, as is the store.
One user in particular we swapped out the display port cables and it fixed it. I know there are different variations of DP cables, but surely this wouldnt affect the monitors just coming out of sleep (in fact its not even sleep, its just "turn monitor off" after 15 mins). And they have had the same setup and cables for a few years so something recently has changed
AlexInnes
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23 Posts
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January 15th, 2026 13:25
Okay it seems we have different issues with different users... but all stemming from Nov/Dec so i still stay its the dock firmware updates
Latest "fix" one user is using a precision 7770 with DC19DCS and had 3 old U2412M screens. Hes had the screens for over 12 years, and other than them (all 3...) not waking after the power saver kicks in (just screens going off, not sleep or hibernate), they still work fine.
We just temporarily swapped them out with 3 newer screens and the problem disappeared. plug in his old ones... problem returns.
Connect those old monitors direct to the laptop via USB-C adaptor or HDMI... no issue.
So its the dock. I am thinking that the more recent dock firmwares have made fixes for other things, but it has broken compatibility with his old screens (both are DP 1.2 so cant be that) I doubt Dell test to see if updates affect 12 year old equipment.
Unfortunately there is no information on the dock firmware page as to what the update was for, other than generic "fixes issues"
But yet other users with the same issue have newer monitors (the same as the newer ones I tested on the above) so my brain is fried.
Its the dock though..........
AlexInnes
2 Intern
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23 Posts
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January 16th, 2026 17:20
Okay through trial and error, and the helpful feedback from others on this forum…. U2412m is the culprit
it seems 95% of our affected users are using U2412m monitors through either WD19/WD19/WD19S/WD19DCS
an affected user was swapped over to new P2425H screens, BOOM, problem gone. Plug his U2412m back in… problem returns
so it is caused by the dock update…. But are those particular monitors affected simply because of their age, or because of their 1920 x 1200 resolution?
i have ordered him the P2425 as 1920 x 1200 is essential (according to him 😒) so will see next week if this fixes it.
(edited)
AlexInnes
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23 Posts
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January 16th, 2026 17:26
@eobiont2
is that U24xx? U2412m is the culprit for us
swapped user to P2425h and it fixed. Put the U2412 back in, problem returns
Until I get a brand new screen that is 1920 x 1200, I can’t prove if it’s just the age of the monitor that’s the problem and the recent dock update has stopped something from
working, or whether the dock update has affected multiple screens running at the 1200 resolution
try swapping out the monitor if you can as a test
AlexInnes
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January 16th, 2026 17:27
@pcwilliams07 @Chad AA
U2412m is the culprit for us
swapped user to P2425h and it fixed. Put the U2412 back in, problem returns
Until I get a brand new screen that is 1920 x 1200, I can’t prove if it’s just the age of the monitor that’s the problem and the recent dock update has stopped something from
working, or whether the dock update has affected multiple screens running at the 1200 resolution
try swapping out the monitor if you can as a test
(edited)
AlexInnes
2 Intern
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January 16th, 2026 18:27
@DELL-ChrisM2
sorry not sure as we are 100% win11
AlexInnes
2 Intern
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January 17th, 2026 18:29
@Gurv56
i think it’s something in the recent dock updates that’s affecting those old U series monitors.
try swapping the monitor
AlexInnes
2 Intern
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23 Posts
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January 19th, 2026 13:33
@esiafi
This is the big problem. Some other people are saying the complete opposite. They were using DVI cables or adaptors and having the problem, then moving to DP cables fixed it.
I have given up and just bought new screens.
AlexInnes
2 Intern
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23 Posts
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January 20th, 2026 07:30
@Chris K2
What model of monitor do you have? As the majority seem to be affected on the E2412m, unless this is more wide spread on newer screens too, i doubt that Dell will spend time or resources to fix 14 year old monitors
AlexInnes
2 Intern
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23 Posts
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January 29th, 2026 14:49
@DELL-Nat M
What about all the other precision etc?
If they are working on the fix, what have they said it the problem? Is it the resolution of the old monitors? a power saving issue?
MPSARC
1 Rookie
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2 Posts
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January 29th, 2026 23:10
I've been suffering the exact same issue since late last year as well. i had assumed it was the WD19 dock, but a couple of days ago the WD19 suddenly powered off and smelt of smoke, so i replaced it with a WD25 but am having the same issue.
my setup is:
Inspiron 16 plus 7640 (Windows 11)
WD25TB4
2x U2412M connected via DP
it appears the combination of WD** dock and U2412M is the culprit.
i found another post on reddit where someone had issues with the U2412M under windows 11 resuming from sleep at a very low resolution. they advised they disabled DDC/CI under the monitor settings and it resolved their problem.
i decided to give it a try, and whilst i only did it yesterday; both my screens resumed from sleep this morning! fingers crossed.
MPSARC
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2 Posts
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February 2nd, 2026 06:42
@MPSARC
confirming resume from sleep has worked perfectly for a few days now since disabling DDCC/CI.
Michal K.
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February 3rd, 2026 11:37
For those having U2412M monitors on Windows 11, make sure that in device manager under monitors, it does not say "generic monitor" or something like that. If it does, go to Dell support page with U2412M, download the driver: Dell U2412M Monitor Driver under Windows 10 64 bit, extract it and in device manager manually install the driver. Then it should say Dell U2412M (Display Port) or any cable you have it connected with, just not the "generic monitor".
(edited)