Level 1

13 points

MacBook Pro 14" 2021 - unable to get 75Hz on Asus MX38VC

Hi fellows,

I am unable to use any 75Hz resolution on Asus MX38VC together with my new MacBook Pro 14" 2021. I had no issues with the same monitor and cable (comes with the display 3.1 USB-c) with MacBook Pro 16" 2017. I have also tried a different cable but the issue persists and I am only able to make it work at 30Hz.

The moment I choose 75Hz the display keeps on trying reconnecting, losing signal and the loop goes on. It stabilises when switched back to 30Hz.

I was thinking of getting a Thunderbolt 3 cable, but since the display only handles usb-c and the other usb-c cable had no effect I doubt this would help.

Monitor set to USB 2.0 which gives max 3840x1600-75Hz

Any ideas what to try?

From Asus manual

Posted on Jan 9, 2022 10:21 PM

Top-ranking reply

Grant Bennet-Alder

Level 10

140,147 points

Posted on Jan 10, 2022 6:21 PM

You may have found that the cable "shipped in the box" is a "lowest bidder" cable rather than a highest quality cable.

You are getting close to the limits of what is possible over a regular USB cable. I suggest you use a high-quality USB-C cable intended for Video and not longer than 1 meter in length.

(and don't mistake the Apple Charge-only cable for a data cable -- it most certainly is NOT.)

Monoprice Essentials USB Type-C to Type-C 3.1 Gen 2 Cable - 10Gbps, 5A, 30AWG, Black, 1m (3.3 ft) - Product # 24285 - $18.49

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50 replies

krisss85 Author

Level 1

13 points

Apr 4, 2022 12:50 PM in response to aglick_descript

Thanks for the update @aglick_descript

Ack on the problem is already a progress :)

Apr 28, 2022 10:09 AM in response to krisss85

How do you guys doing so far? Its horrible to work with in my opinion.

I really think about to sell the display.

krisss85 Author

Level 1

13 points

Jan 10, 2022 11:22 PM in response to Grant Bennet-Alder

Thank you for your feedback. The cable is labeled USB-C 3.1 Gen 2.

I have followed the procedures you described, but it didn't change anything. I have ordered a DisplayPort to USB-C cable to also try that option meanwhile also waiting for Asus support.

Apparently the issue is also a problem for Benq displays. See below. Unfortunately it doesn't seem that Asus supports displays firmware update.

https://www.benq.com/en-us/knowledge-center/knowledge/how-do-i-connect-my-mac-m1-to-benq-monitor.html#s2

krisss85 Author

Level 1

13 points

Jan 12, 2022 1:32 AM in response to krisss85

Well. Tested the new DP 1.4 to usb-c cable, but that one also can only do 30Hz. Another HDMI cable the same. I believe there is either sth with the Asus firmware not prepared for M1 Mac or sth with the M1 Macs themselves.

Gior

Level 1

0 points

Apr 1, 2022 5:56 PM in response to Fateichel

Was your Monterey upgrade to 12.3.1 ? I'm on 12.2.1 with the issue. 12.3.1 supposedly fixes an issue for Mac Mini's with external USB-C and Thunderbolt monitors as a second display. I am downloading 12.3.1 now but don't think the issue is resolved for us. Anyone on 12.3.1 yet and having problems or success?

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MacBook Pro 14" 2021 - unable to get 75Hz on Asus MX38VC