Cant set dual 4k monitors Raspberry Pi 4

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jeremy
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Joined: Fri Aug 16, 2019 4:16 am

Cant set dual 4k monitors Raspberry Pi 4

Post by jeremy »

I can set a single monitor to 4k60 with hdmi_enable_4kp60=1 but this mode doesnt work for dual monitors. The pi 4 can only support 4k30 for dual monitors.

On raspian it auto detects the 4k monitors and sets it to 4k30, I cant for the life of me find a way to set it in the config file for this mode using WTware.

akatik
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Re: Cant set dual 4k monitors Raspberry Pi 4

Post by akatik »

Hello,Send me your terminal log to support@wtware.com
Here's the manual about making logs: http://wtware.com/logs.html

jeremy
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Joined: Fri Aug 16, 2019 4:16 am

Re: Cant set dual 4k monitors Raspberry Pi 4

Post by jeremy »

Log sent.

cwt
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Joined: Wed Aug 21, 2019 9:26 am

Re: Cant set dual 4k monitors Raspberry Pi 4

Post by cwt »

I have a similar problem with 2x DELL 24" monitors running at 1920x1200px. Only one monitor shows a picture, the second one has a signal (backlight is enabled and the status LED is "white") but shows nothing.

Raspberry Pi4B, 1GB RAM

RPi config entry:

[HDMI:0]
hdmi_group=2
hdmi_mode=69
[HDMI:1]
hdmi_group=2
hdmi_mode=69

akatik
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Re: Cant set dual 4k monitors Raspberry Pi 4

Post by akatik »

The same question: do these two monitors run in Raspbian? If so, send me your config.txt from Raspbian SD.

Also, run in Raspbian command line:

dmesg > /tmp/dmesg.txt

and send me file /tmp/dmesg.txt

cwt
Posts: 6
Joined: Wed Aug 21, 2019 9:26 am

Re: Cant set dual 4k monitors Raspberry Pi 4

Post by cwt »

I found a solution for my problem.

Added this entry within WTWARE config menu to my Raspberry config.txt:

Code: Select all

core_freq_min=500
Save the file and reboot. When the login to RDP window appears both monitors are used correctly.

ysammy8
Posts: 7
Joined: Wed Nov 27, 2019 6:18 pm

Re: Cant set dual 4k monitors Raspberry Pi 4

Post by ysammy8 »

Hi cwt

What model monitor do you use?

cwt
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Re: Cant set dual 4k monitors Raspberry Pi 4

Post by cwt »

ysammy8 wrote:
Mon Dec 02, 2019 1:05 pm
Hi cwt

What model monitor do you use?
I use DELL U2415 monitors with direct HDMI connections.

frujo
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Joined: Tue Dec 10, 2019 2:54 pm

Re: Cant set dual 4k monitors Raspberry Pi 4

Post by frujo »

Hello,

we have an similar problem and no way runs as described before.

We use Raspberry Pi4 1GB RAM with WTware current version 5.8.88 and tried to connect 2 equal monitors (iiyama 27" ProLite XB2783HSU) via HDMI connector. Only 1 monitor (HDMI:0) shows picture, second monitor (HDMI:1) has a signal but shows nothing.

In Raspbian both monitors shows pictures.

The steps before my post we have done but no success. We tried different resolutions and connectors, the problem still resits.
Can anyone help us please?

aka
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Re: Cant set dual 4k monitors Raspberry Pi 4

Post by aka »

Manufacturer site: https://iiyama.com/gl_en/products/prolite-XB2783HSU-B3/
Native resolution 1920 x 1080
It's not 4k monitors.

frujo
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Re: Cant set dual 4k monitors Raspberry Pi 4

Post by frujo »

Good morning,
yes, it´s not 4k monitors (I should have opened a new topic?)
But it doesn´t work and I can´t find the problem to send the picture on both monitors.

aka
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Re: Cant set dual 4k monitors Raspberry Pi 4

Post by aka »

frujo wrote:
Wed Dec 11, 2019 10:28 am
Good morning,
yes, it´s not 4k monitors (I should have opened a new topic?)
Yes. For 1920x1080, you do not need 4k magic. It should just work with default settings.
frujo wrote:
Wed Dec 11, 2019 10:28 am
But it doesn´t work and I can´t find the problem to send the picture on both monitors.
https://wtware.com/logs.html

frujo
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Re: Cant set dual 4k monitors Raspberry Pi 4

Post by frujo »

thx for your answer, the log files I have sent to support@wtware.com

akatik
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Re: Cant set dual 4k monitors Raspberry Pi 4

Post by akatik »

frujo
Two regular 1920x1080 displays should work out of box if user does not prevent them from working. Format SD card and install wtware on SD again. It will restore config.txt you broke. Also, remove all lines from config as logging manual says: https://wtware.com/logs.html
2. Remove all lines from terminal configuration file. Absolutely all.
And write config with only two simple lines:

Code: Select all

connection
connection
You should get menu on first monitor and blue fill on second.

frujo
Posts: 13
Joined: Tue Dec 10, 2019 2:54 pm

Re: Cant set dual 4k monitors Raspberry Pi 4

Post by frujo »

Good morning akatik,

thank you for your answer.
I have format the SD card, install new wtware version on it and remove all lines from config.txt.
Now the Raspberry Pi doesn´t boot wtware. I tried different SD cards, different wtware versions, but no variant run ...
If I start with Raspian the Raspberry Pi start normal, also with two monitors.

I will looking for the issue next day.

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