I’m using a MacBook Pro (2025, ARM-based M4 chip) and trying to connect it to a Samsung Odyssey G9 monitor using a USB-C to DisplayPort cable. The cable supports DisplayPort over USB-C (DP Alt Mode). This exact setup works with a MacBook Pro with an M1 Max chip, but with the M4 model, the monitor doesn’t receive any signal.
Any ideas appreciated.
regards
[Re-Titled by Moderator]
MacBook Pro 16″, macOS 15.4
Samsung G9 appear to apply to a series of is 5K displays with the Botton half missing, and HDR 10 bits/color available. Which interfaces at what levels are supported depends on EXACT model numbers.
There appear to be multiple displays with that marketing-name. EXACTLY which model is yours?
that display appears to be a 5K display with the Botton half missing. it supports 10 bits/color HDR
interfaces include
one HDMI 2.0
as many as two DisplayPort 1.4
The display-maker's choice of HDMI 2.0 is unfortunate, as it appears to limit a standard 5K display to no more than 30 hz on a single DIRECT HDMI cable.
Display port 1.4 inherently supports higher resolutions.
When using adapter from a USB-C port, 30 Hz on a single cable.
When using a ThunderBolt port on a genuine Thunderbolt adapter (not just ThunderBolt-compatible), 50 Hz on a single cable.
When using TWO cables (one to drive each of Left/Right of display) MUCH higher resolutions are available, but I don't have access to standard tables that show just how high the refresh rate could go.
With two cables, the display puts the two halves back together with its Picture-By-Picture feature in the display, and Mac users report it works well with no compromises.
On later Macs, if ERROR-FREE operation is not possible, the Mac refuses to connect (at that resolution). This forces the user to reduce colors by disabling HDR and/or reduce the resolution until a picture is obtained.
Certified USB cables need to be shorter than ONE meter for reliable operation. Otherwise, recent versions of macOS will drop the connection to display.
if this is a genuine, trademarked, ThunderBolt cable, its faster speeds require the cable be 0.5 meters or shorter.
Grant Bennet-Alder wrote:
Certified USB cables need to be shorter than ONE meter for reliable operation. Otherwise, recent versions of macOS will drop the connection to display.
if this is a genuine, trademarked, ThunderBolt cable, its faster speeds require the cable be 0.5 meters or shorter.
Thanks.
Does this CABLE have a chance to work?
And exactly what cable are you using?
Can't tell really, some arbitrary USB-C to DisplayPort cable 8K 60Hz.
I was able to successfully connect my MacBook M1 to the monitor, achieving 5K (5210 x 1440) resolution at 120Hz refresh rate.
parmezan wrote:
I’m using a MacBook Pro (2025, ARM-based M4 chip) and trying to connect it to a Samsung Odyssey G9 monitor using a USB-C to DisplayPort cable. The cable supports DisplayPort over USB-C (DP Alt Mode).
And exactly what cable are you using?
hey
LC49G95TSSRXEN - this one
MacBook Pro M4 can't connect to external monitor via USB-C to DisplayPort
