Hi everyone,
I'm trying to determine whether this is a Samsung firmware issue, a macOS issue, or a Thunderbolt issue.
My setup:
• Mac Studio M3 Max
• Latest version of macOS Sequoia
• 2x Samsung ViewFinity S9 (S27C900P) 5K monitors
• Both monitors connected directly to the Mac Studio
• Tested with original Samsung Thunderbolt cables
• Tested with Apple Thunderbolt 4 cables
• UAD Apollo Twin X + UAD Satellite connected via Thunderbolt
The issue is intermittent and affects either monitor randomly.
Sometimes the left display disconnects, sometimes the right one. There is no clear pattern.
When the issue occurs:
• The affected monitor completely disappears from macOS Displays settings
• macOS only shows one remaining display
• The Samsung monitor displays a message saying there is no DisplayPort connection and it will enter standby mode
• Disconnecting and reconnecting the Thunderbolt cable does NOT restore the display
• Turning the monitor off and back on does NOT restore the display
• The only reliable recovery methods are:
- Unplugging the monitor from AC power and plugging it back in
- Restarting the Mac Studio
Additional information:
• Sleep is disabled
• Display sleep is disabled
• The issue existed before installing any monitor utilities
• I have already tested multiple cables
• Since either monitor can fail, I don't believe this is a defective panel
• Both monitors work normally again after power-cycling the affected display
What makes me suspect the monitor is that reconnecting the Thunderbolt cable does nothing, while removing AC power from the monitor immediately restores functionality.
Has anyone experienced similar behavior with:
• Samsung ViewFinity S9
• Dual 5K displays
• Mac Studio M-series systems
• Thunderbolt display connectivity
I would appreciate any feedback, especially from users running multiple high-resolution displays on Apple Silicon Macs.
Thanks.
Attach: This is the message shown by the affected monitor when the issue occurs. The monitor behaves as if no source device is connected even though the Mac Studio remains powered on.
I'm trying to determine whether this is a Samsung firmware issue, a macOS issue, or a Thunderbolt issue.
My setup:
• Mac Studio M3 Max
• Latest version of macOS Sequoia
• 2x Samsung ViewFinity S9 (S27C900P) 5K monitors
• Both monitors connected directly to the Mac Studio
• Tested with original Samsung Thunderbolt cables
• Tested with Apple Thunderbolt 4 cables
• UAD Apollo Twin X + UAD Satellite connected via Thunderbolt
The issue is intermittent and affects either monitor randomly.
Sometimes the left display disconnects, sometimes the right one. There is no clear pattern.
When the issue occurs:
• The affected monitor completely disappears from macOS Displays settings
• macOS only shows one remaining display
• The Samsung monitor displays a message saying there is no DisplayPort connection and it will enter standby mode
• Disconnecting and reconnecting the Thunderbolt cable does NOT restore the display
• Turning the monitor off and back on does NOT restore the display
• The only reliable recovery methods are:
- Unplugging the monitor from AC power and plugging it back in
- Restarting the Mac Studio
Additional information:
• Sleep is disabled
• Display sleep is disabled
• The issue existed before installing any monitor utilities
• I have already tested multiple cables
• Since either monitor can fail, I don't believe this is a defective panel
• Both monitors work normally again after power-cycling the affected display
What makes me suspect the monitor is that reconnecting the Thunderbolt cable does nothing, while removing AC power from the monitor immediately restores functionality.
Has anyone experienced similar behavior with:
• Samsung ViewFinity S9
• Dual 5K displays
• Mac Studio M-series systems
• Thunderbolt display connectivity
I would appreciate any feedback, especially from users running multiple high-resolution displays on Apple Silicon Macs.
Thanks.
Attach: This is the message shown by the affected monitor when the issue occurs. The monitor behaves as if no source device is connected even though the Mac Studio remains powered on.
