3 ms·

Apple has never supported Displaylink or even the DisplayPort 1.2 spec that allows daisy chaining using MST

wlesieutre 6y ago
I don't know about daisy chaining, but they definitely support MST because Dell's UP2414Q uses that to run its 4K @ 60Hz mode
- wlesieutre 6y ago
  Based on downvotes, I guess people don't believe me. Here's a support document from 2014 explaining the capability: http://web.archive.org/web/20140628022826/http://support.apple.com/kb/HT6008 http://web.archive.org/web/20140628022826/http://support.app... Single displays driven as two half panels over MST has been supported since 10.9.3, including the UP2414Q that I mentioned. Otherwise, DisplayPort 1.2 could only give the screens enough bandwidth to run at 30 Hz. > MacBook Pro (Retina, 15-inch, Late 2013) or Mac Pro (Late 2013) also support 60 Hz displays using multi-stream transport (MST). These displays need to be manually configured to use MST. Follow the steps below to use the display's built-in controls to enable this feature. > [display specific instructions omitted] > Your Mac will automatically detect an MST-enabled display. However, your display may require a firmware update to support 60Hz operation. Please contact your display vendor for details. If your specific DisplayPort display is not listed above, check with the display’s manufacturer for compatibility information. Having used that Dell screen on both OS X and Windows, I can tell you this MST capability was better supported on Mac than it was on Windows. On a Mac it worked perfectly. On Windows you'd frequently get half of the screen either black or shifted sideways, creating several visible seams in the image. Not my screenshots, but see here for examples: https://www.dell.com/community/Monitors/UP2414Q-Rev-A03-Wake-Up-Half-Screen-Wrong-Screen-resolution/td-p/4745902 https://www.dell.com/community/Monitors/UP2414Q-Rev-A03-Wake...
Dunedan 6y ago
That's however a software limitation of macOS. DisplayPort with Daisy Chaining works fine on MacBook Pros (and probably all other Macs too) running Linux.

I don't know about daisy chaining, but they definitely support MST because Dell's UP2414Q uses that to run its 4K @ 60Hz mode

wlesieutre 6y ago
Based on downvotes, I guess people don't believe me. Here's a support document from 2014 explaining the capability: http://web.archive.org/web/20140628022826/http://support.apple.com/kb/HT6008 http://web.archive.org/web/20140628022826/http://support.app... Single displays driven as two half panels over MST has been supported since 10.9.3, including the UP2414Q that I mentioned. Otherwise, DisplayPort 1.2 could only give the screens enough bandwidth to run at 30 Hz. > MacBook Pro (Retina, 15-inch, Late 2013) or Mac Pro (Late 2013) also support 60 Hz displays using multi-stream transport (MST). These displays need to be manually configured to use MST. Follow the steps below to use the display's built-in controls to enable this feature. > [display specific instructions omitted] > Your Mac will automatically detect an MST-enabled display. However, your display may require a firmware update to support 60Hz operation. Please contact your display vendor for details. If your specific DisplayPort display is not listed above, check with the display’s manufacturer for compatibility information. Having used that Dell screen on both OS X and Windows, I can tell you this MST capability was better supported on Mac than it was on Windows. On a Mac it worked perfectly. On Windows you'd frequently get half of the screen either black or shifted sideways, creating several visible seams in the image. Not my screenshots, but see here for examples: https://www.dell.com/community/Monitors/UP2414Q-Rev-A03-Wake-Up-Half-Screen-Wrong-Screen-resolution/td-p/4745902 https://www.dell.com/community/Monitors/UP2414Q-Rev-A03-Wake...

Dunedan 6y ago

That's however a software limitation of macOS. DisplayPort with Daisy Chaining works fine on MacBook Pros (and probably all other Macs too) running Linux.