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Old 07-16-2018, 09:57 PM   #1
RadioPhil
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Default USB-C to HDMI dock - no video controls or LUT support

I bought a USB-C dock with DisplayPort and HDMI ports. It uses DisplayLink. After I installed the driver, video (color) quality looks bad. Near-white levels clipped to white and near-black levels are crushed to black. My Intel Graphics control panel has gone missing, and the DisplayLink driver appears to have no controls. So I have no way, apparently, to do even basic video settings like brightness, contrast and gamma.

I have color calibration hardware and software. I attempted to use it for this issue but it errored out: "Failed to apply video LUTs" (look up tables).

It appears that I have no way to have a correctly calibrated display, or even a usable one. Yet when I connect the monitor directly to the computer USB-C port with a USB-C-to-HDMI cable, everything works. Please tell me that I have missed something.

Thanks,
Phil
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Old 07-18-2018, 03:21 PM   #2
AlbanRampon
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Hello Phil,

I believe there are a few confusions or at least shortcuts in here.
As standard, the driver does zero correction. So if your external display is not setup properly like for instance contrast and brightness pushed, then it will look bad. Claiming the monitor is not "even usable" suggests this is way off.

Brightness and contrast are implemented via a standard called DDC/CI. This standard is implemented through numerous applications like Screenbright. This does not, and never has, required Gamma LUT. Other applications varies based on dock and monitor model as some manufacturers may enable only their hardware.
Should you not wish to use another software, then your monitor should have buttons to at least change brightness and contrast.

Colour calibration through gamma LUT is not publicly released today as the feature is not ready. This is in development in Windows 10, as Windows 7 is end of lifed by Microsoft. Depending on the hardware you have, this might be possible today for you with a registry key as a preview.

Kind regards,
Alban
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Old 07-21-2018, 07:44 PM   #3
RadioPhil
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Thank you Alban. I must admit I had not heard of DDC/CI before this. I did some Googling and learned a bit about it. I think my monitor (LG 32UD59-B) is close to its default settings, but perhaps I can fix the black crush and white clip issues by changing monitor settings.

Even if I'm successful with black and white levels, I don't think I will be able to calibrate gray scale (gamma) and colorimetry properly from there. I'm not sure, but I don't think my calibration gear (x-rite i1Display Pro) can do it without LUT support.

I'm out of the office currently, but will get back to this when I return.
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Old 07-22-2018, 03:22 PM   #4
AlbanRampon
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I found a recent review of that monitor taking about picture quality
https://www.rtings.com/monitor/reviews/lg/32ud59-b

DDC/CI won't change gamma.
The display would have settings to change the colour profile and colours individually. At least, the LG display I use at home has.
You're correct that your display calibration hardware will try and send gama correction tables.

The DisplayLink driver released doesn't change gamma tables, so if the image is despicable, it's difficult to blame the thing that doesn't change it...

Depending on the hardware you use, a registry charge might allow you to calibrate your display. As the feature is not ready and only working on specific hardware, it isn't released.
What is the hardware brand and model you have with DisplayLink technology inside? If you've got the Hardware ID from Device Manager advanced details, it also tell me what is inside.

Kind regards,
Alban
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Old 08-03-2018, 04:33 PM   #5
RadioPhil
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I read that review before deciding to buy this monitor. My favorite sentence is "With only minor corrections to the settings, the monitor achieves near-perfect color results." The results the review refers to are after calibration, though.

I tested my DisplayLink device again, this time resetting the monitor to its defaults. Now, black and white levels are spot on - no clipping or crushing. But my x-rite device cannot complete its calibration because it cannot save the LUT it created.

My device that uses DisplayLink technology is WavLink WL-UG69DK1 Rev B.
Device Manager properties, Details tab, Hardware IDs property, says
USB\VID_17E9&PID_6000&REV_0106&MI_00
USB\VID_17E9&PID_6000&MI_00

I hope I have hardware that will allow me to calibrate my monitor. I can make whatever registry changes you suggest.
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Old 08-06-2018, 10:37 AM   #6
AlbanRampon
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Hello Phil,

I don't have a build for you today.
Provided it passes the quality bar, this is planned to be a 9.0 deliverable. It won't fit in 8.6 because the feature hasn't been tested yet.

On that product, you will need to use DisplayPort output for LUT support.
I will post when I have something I can share. 9.0 is planned for later this year, after 8.6.

Kind regards,
Alban

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Old 08-06-2018, 11:28 AM   #7
RadioPhil
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Thank you Alban. Glad to hear that LUT support is coming. It won't be a problem for me to use DisplayPort instead of HDMI.
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