Date: Sun, 22 Dec 2024 14:55:53 -0800 From: Mark Millard <marklmi@yahoo.com> To: mohammad@thelightbird.com, freebsd-hackers <freebsd-hackers@freebsd.org> Subject: Re: USB4/TBT3 support [related side note?] Message-ID: <5EC4A592-15B7-44EC-85F8-AA2CD0332062@yahoo.com> References: <5EC4A592-15B7-44EC-85F8-AA2CD0332062.ref@yahoo.com>
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Mohammad Noureldin <mohammad_at_thelightbird.com> wrote on Date: Fri, 20 Dec 2024 16:04:20 UTC > . . . This is more a note about a context that may in some ways be somewhat analogous, despite TBT3+ and USB4+ not being involved. The example that I have access to is a Windows DevKit 2023. It has 3 USB-A ports and 2 USB-C ports. FreeBSD works with the USB-A ones but not with the USB-C ones. (The FreeBSD loader work for all --via the UEFI/ACPI, of course.) What seems to be unique that might contribute is that the 2 USB-C ports also support HBR3 Transmission Mode (4 lane x 8.1 Gbps/lane) that has support for: SST: 5120x2880 @ 60Hz, SST: 4096x2160 @ 60Hz, MST: (x2) 3840x2160 @ 60Hz (RB2), MST: (x2) 2560x1600 @ 60Hz (CVT, RB) (Not that I use the USB-C ports at all. I stick to the USB-A USB ports.) I'm not proposing that you make the Windows DevKit 2023 USB-C ports work. I just do not not know how common such a combination is for USB-C. It may be more of an aarch64 specific combination rather than anything generalizing much to amd64. The Windows DevKit 2023 also has a mDP HBR2 port that I do use. === Mark Millard marklmi at yahoo.com
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