On Wed, 2022-06-08 at 16:27 +0200, Tomasz Moń wrote: > On Fri, 2022-06-03 at 08:04 +0300, Mika Westerberg wrote: > > On Thu, Jun 02, 2022 at 09:34:27PM +0200, Tomasz Moń wrote: > > > How do I determine that the cable is non-Thunderbolt Type-C? > > > > It does not have that "lightning" logo on the connector. > > I got two more (to a total of 4) cables without lightning logo and all > seem to enter Thunderbolt mode. I managed to get an active 3 meters long USB Type-C cable. It is both a directional cable (meaning the host end has to be plugged into laptop and sink into dock) and appear to have working display port only when connected with correct plug orientation. That is, rotating USB-C plug 180 degrees switches between working DP altmode and non-working. The active cable I have features retimer in the middle of the cable. The retimer is definitely noticeable (it is bulky) and does get warm when in use. This cable indeed does inhibit Thunderbolt operation and dock status in boltctl is disconnected. The EMCA information for the active cable is below. Even though the cable is 3 meters long it claims to be 2 meters. Type Active Cable Vendor Unknown (0x0bda) Specs [ <20ns (~2m) ] [ 20V ] [ 3A ] [ USB3 10Gbps ] VER HW:0001 FW:0002 VDO:0 v:2 Vdo object hex IdHeader 0x24000bda CertStat 0x00000000 Product 0x00000209 Cable 0x120851b2 SVISD 0x0bdaff01 TBT3/4 0x00000000
