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What kind of cable you are using? Is it short TB4/5 >>> cable or something else? >> >> It is a short Thunderbolt 5 cable: StarTech TBLT5MM50CM240W, 0.5 m. > > Okay so definitely it should enter USB4 mode. > >> One retimer enumerates on the link, 1-0:2.1 (vendor 0x7fea, device >> 0x1032, "retimer NVM format of vendor 0x7fea unknown"), and it goes >> away when the dock is unplugged. I haven't been able to tell from >> Linux whether it sits in the cable or on the DEG2 board. > > That's the host side retimer. > >> In case it is useful, here is PORT_CS_18 from both ends, read just now >> (same boot as my last mail): >> >> $ tbdump -d 1 -r 0 -vv -a 2 -N 1 PORT_CS_18 >> 0x00d2 0x00002f00 0b00000000 00000000 00101111 00000000 ../. PORT_CS_18 >> [00:07] 0x0 Cable USB4 Version >> [08:08] 0x1 Bonding Enabled (BE) >> [09:09] 0x1 TBT3-Compatible Mode (TCM) >> [10:10] 0x1 CLx Protocol Support (CPS) >> [11:11] 0x1 RS-FEC Enabled (Gen 2) (RE2) >> [12:12] 0x0 RS-FEC Enabled (Gen 3) (RE3) >> [13:13] 0x1 Router Detected (RD) >> [20:20] 0x0 Cable Gen 3 Support (CG3) >> [21:21] 0x0 Cable Gen 4 Support (CG4) >> [22:22] 0x0 Cable Asymmetric Support (CSA) >> [23:23] 0x0 Cable CLx Support (CSC) >> >> $ tbdump -d 1 -r 2 -vv -a 1 -N 1 PORT_CS_18 >> 0x00d2 0x00902f01 0b00000000 10010000 00101111 00000001 ../. PORT_CS_18 >> [00:07] 0x1 Cable USB4 Version >> [08:08] 0x1 Bonding Enabled (BE) >> [09:09] 0x1 TBT3-Compatible Mode (TCM) >> [10:10] 0x1 CLx Protocol Support (CPS) >> [11:11] 0x1 RS-FEC Enabled (Gen 2) (RE2) >> [12:12] 0x0 RS-FEC Enabled (Gen 3) (RE3) >> [13:13] 0x1 Router Detected (RD) >> [20:20] 0x1 Cable Gen 3 Support (CG3) >> [21:21] 0x0 Cable Gen 4 Support (CG4) >> [22:22] 0x0 Cable Asymmetric Support (CSA) >> [23:23] 0x1 Cable CLx Support (CSC) >> >> (The wake status bits and TIP, 16-19 and 24, are 0 on both sides.) >> >> So both ends are in TBT3-compatible mode, but the host side reports >> Cable USB4 Version 0 and Cable Gen 3 Support 0, while the DEG2 side >> reports Cable USB4 Version 1 and Cable Gen 3 Support 1 for the same >> cable. > > Agree it looks like the AMD host only gets the link up Gen2 for some > reason. It could be retimer/PD firmware issue. Anyways I'm adding the AMD > experts if they have any ideas. I'd lean on more likely a PD controller issue. Did you already look for a BIOS update? Most vendors distribute PD updates with BIOS/EC. If there is no update available; can you start with reporting to your vendor and let them reproduce and get some PD traces to confirm?