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- HP Community
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- Issue with ElibeBook 850 G7 and 3 displays on HP G5 Dock

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01-22-2021 01:59 PM
I have an EliteBook 850 G7 and bought an HP G5 usb-c dock so I could connect my 3 LG 22" displays to the laptop.
When I close the lid the 3rd display comes on but stuck at 640x480 resolution.
2 displays and the laptop work perfect. Switching cabling from the dock to test with different displays shows the display working fine. I have 2 connected with DP to DVI adapters and DVI cables to the monitors (they only have VGA and DVI). The 3rd is an HDMI to DVI cable.
I updated all of the firmware on the laptop and dock. No go.
Any ideas?
Thank You
Michael
Solved! Go to Solution.
Accepted Solutions
01-26-2021 04:38 AM
Hello
enter BIOS setup, pressing F10 during boot,
than search for "Enable High Resolution mode when connected to USB-C DP alt mode dock", enable this setting.
save configuration and try again with 3 FHD monitors.
bye
01-22-2021 02:37 PM
Please check page 5 of the following document to adjust
https://www8.hp.com/h20195/v2/getpdf.aspx/c04168358
also the note on page 6
Regards.
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01-26-2021 04:38 AM
Hello
enter BIOS setup, pressing F10 during boot,
than search for "Enable High Resolution mode when connected to USB-C DP alt mode dock", enable this setting.
save configuration and try again with 3 FHD monitors.
bye
01-26-2021 10:12 PM - edited 01-26-2021 10:38 PM
I also have the exact same issue with my 850 G7. I have an Anker 13-in one USB-C dock and the third monitor flickers at some low interlace resolution I think 576i. I also was able to borrow an HP Gen 5 Dock but it has the exact same problem. Monitors are 1080p.
It does work with 1080p on laptop screen and two 1080p external monitors so the video card is capable o this, just seems a problem with USB-C output.
I will try searching tomorrow for BIOS setting "Enable High Resolution mode" but I don't remember seeing that before when troubleshooting this on the weekend... hopefully I missed this. I have heard with other laptops that this may lower the USB rate and/or ethernet speeds on the dock also.
01-27-2021 11:04 PM
I tried the setting and it did not fix the resolution issue. I am using an Anker USB-C dock which supposed to support three external monitors. I have not tried the HP Gen 5 dock with this setting. However, even if it did work, I am not Sure that I would like the limited USB 2.0 speeds and slower ethernet.
01-28-2021 09:34 AM
Hello
I connected USB-C Dock G5 to USB-C port on 840 G7, the one close to HDMI port.
Then I connected 3 monitors to the docking video ports:
one on HDMI (It's a 4K display)
one on DP (it's another 4K display)
one on DP , this is really Full HD.
notebook display is off as the notebook's lid is closed.
without enabling the feature in the BIOS, it was not possible to configure 3 monitors at 1920x1080
Then I shutdown, entered in BIOS setup and enable the BIOS setting for High speed .
I restarted windows 10 and manually adjusted the montors setting to 1920x1080 on the 3 monitors.
as with MS display setting you can't set the Refresh rate, I started Intel Graphis utility
and I set all 3 monitor 1920x1080 at 60 HZ.
finally I restared Win 10, still with notebook lid closed, In order to verify is the 3 monitors were still configured in the same way. The configuration was mantained.
I one more testing and finally I see that it's possbile to have two external monitor at 3840x2160 at only 30 Hz , with notebook lid closed.
a solution able to support 2 monitors at 3840x2160 at 60 Hz , you need aN HP thunderbolt Dock G2 or an HP Universal Dock G2.
bye