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dcbbleo
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Posts: 59
Registered: ‎10-20-2018
Location: CA
Views: 199
Message 11 of 20

Re: Thinkpad E585 - external monitor Dell U2312HM - Resolutionchange not possible

Could it be the cable you are using? Is it a cable with HDMI and Displayport on either end or an adapter connecting a HDMI to HDMI cable? USB-C to HDMI?

 

The only other tests, which would be a bit difficult, would be to try the cables on a different device (like a recent smartphone with USB-C) or a different OS.

 

Have you tried the software solutions? Scaling and in-game settings?

Administrator
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Message 12 of 20

Re: Thinkpad E585 - external monitor Dell U2312HM - Resolutionchange not possible

HDMI to DP cable, which is what you say you have, was never qualified / tested on the E585 so unfortunately no guartees it can work. One solution would be an USB-C docking and then connect from the docking's DP to the DP on the display.

 

Andy

 

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kartoffelgpnst
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Views: 149
Message 13 of 20

Re: Thinkpad E585 - external monitor Dell U2312HM - Resolutionchange not possible

Its not the cable, it worked just fine on another laptop.

There is no adapter, its just the cable.

 

I tried software solutions, nothing works.

kartoffelgpnst
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Message 14 of 20

Re: Thinkpad E585 - external monitor Dell U2312HM - Resolutionchange not possible

Okay so my question then is:

 

Does anyone have a E585 with any external display and is able to downscale resolution, so I know its this combination?

 

dcbbleo
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Views: 132
Message 15 of 20

Re: Thinkpad E585 - external monitor Dell U2312HM - Resolutionchange not possible

Hdmi works fine. I've been meaning to get a small USB-C hub with ethernet and hdmi so the following post might give me something to watch out for as well.

 

Apparently, some ideapad users discovered that their usb-c  port might not be implemented fully. Perhaps you are having a similar issue.

 

As a matter of fact, I have an old Lenovo ThinkCentre with a Displayport port that was built without audio transmission...

 

It could also be a usb 3.1 vs 3.0 issue with the cable... random guessing...

 

https://forums.lenovo.com/t5/Lenovo-IdeaPad-1xx-3xx-5xx-7xx/320-15IKB-USB-Type-C-to-HDMI-not-working...

dcbbleo
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Views: 123
Message 16 of 20

Re: Thinkpad E585 - external monitor Dell U2312HM - Resolutionchange not possible

There's an Acer support page mentioning that some of their monitors might need to be specifically set to DP Alt Mode.

 

It also specifies that the USB-C display logo indicates official support.

 

Looks like this is not as straightforward as we'd all hope.

 

https://us.answers.acer.com/app/answers/detail/a_id/48481/~/how-to-connect-a-computer-with-usb-c-por...

dcbbleo
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Message 17 of 20

Re: Thinkpad E585 - external monitor Dell U2312HM - Resolutionchange not possible

Sorry for the multiple posts; I'm in the market for a usb-c travel hub so this is part of my shopping.

 

There seems to be some consideration required regarding Displayport Alt Mode vs plain Displayport vs HDMI Alt Mode...

 

https://superuser.com/questions/1192638/whats-up-with-hdmi-and-displayport-over-usb-c

 

Lenovo's dock lists compatibility with our E585, but it only has 2x DP and 1x VGA (No HDMI)...

 

https://www.lenovo.com/ca/en/accessories-and-monitors/docking/universal-cable-docks-usb/Thinkpad-USB...

kartoffelgpnst
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Views: 89
Message 18 of 20

Re: Thinkpad E585 - external monitor Dell U2312HM - Resolutionchange not possible

But then my HDMI port would be the problem?
Because I'm not using the USB C port for the monitor?

 

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kartoffelgpnst
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Message 19 of 20

Re: Thinkpad E585 - external monitor Dell U2312HM - Resolutionchange not possible

Didn't understand it all, but I guess a possible solution could be getting a USB-C to DisplayPort cable?

Or did I get something wrong?

dcbbleo
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Message 20 of 20

Re: Thinkpad E585 - external monitor Dell U2312HM - Resolutionchange not possible

Oh wow! I was on the wrong track all along! I thought you were going from your USB-C (which uses Displayport protocol) to the monitor's hdmi. I just checked (which I should have done before) and that monitor doesn't have hdmi, only displayport and dvi.

 

I'm so sorry. The hdmi port on our 585 is definitely NOT the problem. I haven't seen many instances where people needed to go from hdmi-out to displayport-in because hdmi input on monitors is more common.

 

My recommendation is to use the dvi port if you can find a cheap adapter. Dvi-hdmi conversion was supposed to be more straightforward so I'm pretty sure it will work.

 

Why did you choose the displayport?

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