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HP Recommended
HP Z34c G3 WQHD Curved Display
I'm using a HP Z34c G3 WQHD Curved Display (Product number: 30A19AA, Firmware version: 1.2.17.0) connected to a Windows 11 desktop through DisplayPort and sometimes I also dock a Windows 11 laptop using the USB-C connection. USB keyboard and mouse are connected directly to the monitor. The monitor switches either to the desktop or laptop as needed.

 

This works great when both desktop and laptop are connected. I like being able to use the KVM (Keyboard-Video-Mouse) toggling between the two devices by pressing the keyboard left Ctrl key twice.

 

The problem comes when I don't have the laptop connected.

 

I have my desktop set up in Windows Settings > System > Power > "Screen and sleep" set to "When plugged in, turn off my screen after `15 minutes`" and I have the monitor set to
Power Mode              Performance
Auto-Sleep Mode         On

 

If the desktop screen goes to sleep and no laptop is connected, then the monitor goes into Auto-Sleep Mode (as it is supposed to) and the power light turns to amber.

 

To wake up the desktop I should just be able to activate the mouse or keyboard. This always works if the laptop is connected (running or in sleep mode), however if only the desktop is connected then sometimes I can wake up the desktop and sometimes I cannot.

 

I'm using the following Input settings:

 

DisplayPort
Auto-Switch Input   On
DP Hot-Plug Detection   Always Active
DisplayPort Mode        DisplayPort 1.4
USB Host                Auto-Switch USB Host
                        Bind USB Host to specific port
                            USB 1(Type-B) binding
                                DisplayPort
                            USB 2 (Type-C) binding
                                USB-C Video

 

To work around this issue I connected another USB mouse directly to the desktop. If I can't wake up the desktop using the keyboard/mouse connected to the monitor, then I move the mouse connected directly to the desktop. This never fails to wake up the desktop, which activates its video signal and wakes up the monitor successfully.

 

Is anybody else struggling with this configuration? It seems like it ought to be a common use-case to have a fixed desktop connected and a laptop which is sometimes docked to the monitor and sometimes not.

 

I opened an HP support case via telephone on Jan 23, 2024 for this issue.
They initially advised me to update the firmware from version 1.2.16.0, which the device was using when it was delivered in Jan 2024, to the latest version 1.2.17.0. This did not resolve the issue, so I am waiting for hear back from HP Support for further instructions.
3 REPLIES 3
HP Recommended

Here are the workarounds I found so far. This is about using the HP Z34c G3 monitor in a dual computer configuration where a desktop is permanently connected via USB-A.  A laptop is normally used connected via USB-C and the laptop is currently not connected. Windows 11 power saving has put the desktop screen to sleep, the monitor has gone to sleep and can't be woken up by simply moving the mouse.

Workarounds:

1. Press and quickly release the power button on the desktop attached via USB-A to wake up the desktop.

2. Attach a second mouse directly to the desktop attached via USB-A and move the mouse to wake up the desktop.

3. Plug the USB-C cable back into the laptop that was previously using this connection. Power on the laptop (USB-C computer).  Use the KVM function to toggle the monitor to the desktop connected via USB-A by pressing the left Ctrl key on the keyboard connected to the monitor twice (repeat if necessary) and move the mouse to wake up the desktop connected via USB-A.

 

What else I tried that didn't work:
- Turning the monitor off and back on again, then moving the mouse.

HP Recommended

I recently got a new desktop (bigger, faster, etc.) and so I've hooked this up via HDMI in addition to the original desktop on DisplayPort. Now even if the new desktop isn't powered up, I now have no problem to wake up the original desktop by moving the mouse and pressing a keyboard key. That seems very strange, but it is a welcome relief.

 

It doesn't seem like anybody else has the same problem, as there have been no replies here. In the meantime HP Support has proposed to exchange the monitor hardware under warranty, so we'll see if that solves my issue or not.

HP Recommended

I don't know if this is in the same area.  Lacking the skill is a bleep but age does things!  I have a desk top and an All-in-One tied together via HDMI.  One difference, I was running a diferent - OLD - desktop.  There was a time, years ago?, when I could boot either computer on its own now the All-in-One tells me there is no HDMI cord and the monitor is turned off (these messages are given to me on the "turned on" monitor/Al-in-One.

Machines HP Pavilion Gaming Desktop TG01-2260xt and HP Pavilion All-in-One - 27-r015z.  The All-in-One is ageing but the desk top is strong enough and new enough to be ok,

† The opinions expressed above are the personal opinions of the authors, not of HP. By using this site, you accept the <a href="https://www8.hp.com/us/en/terms-of-use.html" class="udrlinesmall">Terms of Use</a> and <a href="/t5/custom/page/page-id/hp.rulespage" class="udrlinesmall"> Rules of Participation</a>.