Ubuntu
mutter package

  1. Bug #1886729
  2. Comment #4

Comment 4 for bug 1886729

Revision history for this message
Daniel van Vugt (vanvugt) wrote :

Hmm, it seems Thunderbolt-DisplayPort cables are pretty rare. Instead of searching for those I suggest looking for adapters that are explicitly for "Thunderbolt" and not "USB".

USB 3.0 has a bandwidth of 5 Gbps
USB 3.1 has a bandwidth of 10 Gbps

4K at 60Hz however requires 3840x2160x4 (33177600) bytes per frame, 265420800 bits per frame, or ~16 Gbps. USB never had a chance and at best would give you only 30Hz.

So make sure your adapters are "Thunderbolt" and not "USB". Thunderbolt 3 in your laptop supports 40 Gbps which is enough for 4K at 120Hz.