> It is even possible to have linux machine act as a display port sink to be used as a capture card, for streamers, youtubers,... with 0 dollar investment, 0 hardware...
This is not true. When a USB-C connection is being used in DisplayPort Alternate Mode two or four of the high-speed pairs in the cable are literally switched from being connected to the USB controller to being connected to the DisplayPort controller. Both the source and sink devices have to support the same alternate modes to operate, so you would still need to have actual DisplayPort sink hardware to capture a DP-on-USBC signal. DisplayPort capture hardware is rare on its own compared to HDMI capture, I don't think there's a single one out there that takes a USB-C DP Alt Mode input because there's no real reason to ever do that.
And for what it's worth, Macs have had this ability for basically as long as they've had Thunderbolt. The same can also be done over Firewire on all major platforms, but these days 400/800mbps just isn't what it was back in the day.
edit: Also meant to mention that while Thunderbolt has always been rare on AMD due to its requirement of an Intel chip, USB4 is somewhat common nowadays as it's officially supported on the Zen 3+ and newer CPUs
yeah i had mac and had to clone disk over tb one time.
but mac recovery is magical, wifi password is written in NVRAM and if you erased/replaced whole disk, "recovery agent" started and downloaded macos image over wifi and installed it ! it was on intel mac, im not sure if it still works same way in arm. it took 2 hours XD
apples firewire and tb had problems with security, it was possible to do DMA reads from your ram over those. from external device.
The DMA security issue was an Intel problem more than an Apple problem. It was Apple's popularization of Thunderbolt that got Intel to finally stop disabling IOMMU support for product segmentation reasons.
security issue was Apple thing, they say security, privacy but have tb, firewire with posibility of "TSA" agents cloning your drive in 3 minutes. has nothing to do with any product segmentation. also they HAD icloud backups not encrypted, but had big public fight with FBI about unlocking ones iphone... good old days.
Not true; basically everyone shipping laptops with Firewire ports in that era was at risk of DMA attacks. Apple was merely the most notable vendor trying to offer something better than USB 2.0.
> has nothing to do with any product segmentation
Go look at which Intel Sandy Bridge or Ivy Bridge processors had VT-d (IOMMU) capability enabled vs disabled. The product segmentation strategy is on plain display. They made overclocking mutually exclusive with IOMMU for several generations of processor. There's no technological basis for that, just artificial product segmentation.
Please put at least a little bit of effort into fact-checking yourself before continuing ranting. It's not that hard, and you'll be much more convincing if you don't exaggerate your complaints to the point of being obviously wrong.
The driver has been built in to Windows for years, as it's the same tech as Thunderbolt networking. Just plug two Thunderbolt or USB4
https://learn.microsoft.com/en-us/windows-hardware/design/co...
> and 4 line patch to enable this in linux?
Supported since kernel 4.15 in early 2018.
https://www.kernel.org/doc/html/v4.15/admin-guide/thunderbol...
> It is even possible to have linux machine act as a display port sink to be used as a capture card, for streamers, youtubers,... with 0 dollar investment, 0 hardware...
This is not true. When a USB-C connection is being used in DisplayPort Alternate Mode two or four of the high-speed pairs in the cable are literally switched from being connected to the USB controller to being connected to the DisplayPort controller. Both the source and sink devices have to support the same alternate modes to operate, so you would still need to have actual DisplayPort sink hardware to capture a DP-on-USBC signal. DisplayPort capture hardware is rare on its own compared to HDMI capture, I don't think there's a single one out there that takes a USB-C DP Alt Mode input because there's no real reason to ever do that.