Mac Studio causes monitor on/off flicker with Sequioa

I hear you, this is what I am using: 2.3FT Thunderbolt 4 USB C to USB C Certified Cable, 8K Display/40Gbps/100W Charging Cord. It is currently 2 months old.

1. DisplayPort differences

• • Thunderbolt 4 – DisplayPort 1.4 (HBR3) supported up to 2 meters with passive cables
  • Thunderbolt 3 – DisplayPort supported with passive cables (less than 1 meter) but active cables (1 meter or greater) do not carry DisplayPort signal and won’t work to drive a USB-C display

Monitor specs for port:

ThunderboltTM 4

upstream

Connect to your computer using the ThunderboltTM cable.

The ThunderboltTM 4 upstream offer the fastest transfer

rate (USB 4 40Gbps), TBT mode and the alternate mode

with DP 1.4 support the following, and PD 28 V/5 A,

20V/4.5A, 15 V/3 A, 9 V/3 A, 5 V/3 A.

Maximum resolution of 6144 x 3456 at 60 Hz (DSC)

The ThunderboltTM 4 upstream power is more than 100W,

the connected equipment and accessory cables should

have fire enclosure of V1 level or higher and VW-1 rating

wire.

This model will feature ThunderboltTM 4.0 technology

and will have a 140W power delivery, it is recommended

for use the following Dell’s products that meet the fire

enclosures.

I brought up "Display" in settings and, interestingly, where I previously had P3 selected for color profile, it now had defaulted to just list the model number of my monitor. I now have switched it back to P3 color profile, not sure if that will do anything.

My monitor cord (currently Thunderbolt 4) does go straight into the monitor from the Studio... just the keyboard and mouse use the monitor as a hub. The Thunderbolt 4 cable is certified and is Anker. Since this is a desktop setup, there is limited cable wear. I also have changed the Thunderbolt 4 port the cable goes into the Studio with to see if that may help.

Thanks for the suggestions... if the issue persists I may need to explore getting additional cables. No issues in the few minutes since I've made the latest changes.

It is not... 1-1.5M. No issues for 3 months, installed Sequoia, then issues every day since, multiple times a day. As they say, there are no coincidences.

But I am clear on your direction, when all else fails, use a short, certified cord directly between the 2 devices. I get it, but that will require me to reorganize my entire desk set-up, so want to exhaust all other possibilities first.

BTW, if Apple designs equipment that can only be used with .5M cords, I may need to go back to Windows or Linux. Unacceptable.

My latest update... on another site, someone advised to toggle on in Energy Saver the option to not have a sleeping monitor put the Studio to sleep. Since making that adjustment yesterday afternoon, I have not seen a monitor glitch issue when the Studio comes out of sleep (that I manually put it in), but still too early to claim it a fool-proof work-around. When I manually put my Studio to sleep and bring it out of sleep, no issues so far. I'm not convinced I have a cable issue. I don't think this is specifically a Sleep mode issue, but somehow seems related to auto sleep with my monitor, and maybe Dell monitors or this specific model / 6K monitor? If I have no issues for several days I will undo that energy saver toggle and see if the issue immediately returns.

To close this out... I now have had no monitor glitch issues for a couple days. What appears to be the work around is my manually putting my Studio to sleep vs. using the function of having the Auto sleep enabled when the monitor goes to sleep.

It does not appear to be cord related... specifically, the exact same symptoms occurred whether using an HDMI or Thunderbolt 4 certified cable.

Color Profile correction did not solve The Glitch. So maybe it is the cord. For now, I'll live with the annoyance. If it becomes a problem I'll consider next steps.