XPS 15 7590, S2719DM, no HDR compatibility?

@OHelp  according to the S2719DM's manual on support.dell.com (direct link here), specifically Page 17 "Requirements to view or play back HDR content", that system should absolutely be able to send HDR content.  Regardless of whether the HDMI output is physically wired to the Intel GPU or NVIDIA GPU (I'm not sure about that system, but previous XPS 15 models have wired all outputs to the Intel GPU), both GPUs in that system exceed the minimum GPU generation requirements outlined on that page.  Windows 10 Redstone 3 is Windows 10 1709, which is 3 releases behind the current version, so as long as you have that, up-to-date Intel and NVIDIA Graphics drivers, and an HDMI 2.0 cable (sometimes noted as an HDMI High Speed or 18 Gbps cable), then you should be set.  Have you checked Display Settings to see whether the slider to enable HDR is available and/or tried using any applications that you know support HDR playback, or are you just relying on what a Dell Support tech told you?

Thanks for your fast response I really appreciate it. yeah I thought the same, it's good to hear someone agreeing with me after I was shut down on tech support. I have purchased two HDMI 2.0 leads. The latest being the amazon basics high speed HDMI 2.0.... Dell tech acknowledged the screen I have is hdr but told me the xps 15 shows nothing wrong and theirs is the same but I tried to explain that this laptop should be able to work with it but they were having none of it... after connecting to my laptop and playing around this is what was sent to me. I know edge browser is capable of playing HDR videos so I loaded one up on my laptop which worked fine but when I switched to the external monitor wouldn't allow HDR content to load and instead reverted to standard definition 

"We have already checked with our product team and we informed you that the unit is working as it should. The Stream HDR options works only with internal display and not with external monitor However, if you could find a work around and if a driver could fix it, then nothing like it."

Wait, HDR works on the built-in display?  The specs of the XPS 15 7590 don't seem to mention that for either of the display options on the system.  I see a reference to Dell Cinema that does discuss HDR, but I'm not sure that refers to the formal HDR10 spec.  I've seen Dell products claim "HDR" support where there's literally an asterisk, which leads to fine print saying that it refers to "Dell HDR" and does not imply support for an industry standard spec like HDR10 or Dolby Vision.  So "Dell HDR" was basically something that Dell created to turn SDR content in a higher dynamic range.  But maybe this Dell Cinema thing tells Windows that the built-in display supports HDR even if it doesn't support an industry standard and then works with the display somehow.

At any rate, none of that should matter when it comes to the external display, which DOES support the formal HDR10 spec. There's nothing in Windows Display Settings or the Intel HD Graphics Control Panel to enable HDR and advanced color?

I remember when I was using a friend's PC hooked up to his HDR TV that we had to enable HDR within Windows before any application would allow it to be used.  If you can't find anything there, then do you perhaps have even temporary access to an HDR TV you can test with?  I'm wondering if this might be a strange incompatibility with these specific devices that shouldn't exist but does.  For example, there's a known issue with the XPS 13 9350 when connected via USB-C to with certain Dell USB-C displays, specifically that no video output ever appears.  The XPS 13 9350 can send video to other USB-C displays just fine, and those Dell USB-C displays can accept video on their USB-C inputs from other USB-C sources just fine, and the XPS 13 can even send video to those Dell USB-C displays when using a USB-C to DisplayPort cable.  But for some reason, using that system with those displays over native USB-C doesn't work.  Dell published a KB article about this but unfortunately didn't explain the underlying cause or provide a fix.  They basically said that this won't be fixed because that system is end-of-life.  After that KB was published, it was found that the XPS 15 9550 (same generation as the XPS 13 9350) suffered from the same issue.

My 7590 OLED only supports HDR on the internal display and is limited to Netflix and YouTube using the Edge browser only. Under Windows HD Color settings Display capabilities, only 'Stream HDR video' is allowed. HDR games, apps, and WCG apps have NO after them.

I've not been able to get HDR using the HDMI 2.0 port to my LG OLED, only 4k 60Hz. I've enabled all the HDMI inputs on the TV for UHD Deep Color using a proper cable from the 7590 and still don't get HDR.

This is a major disappointment and will most likely result in my returning the 7590 back to Dell. 

@Kouioui  you definitely won't be able to get 4K 60 Hz HDR out of that system because although it has an HDMI 2.0 port, that port is fed by a DisplayPort 1.2 output from the Intel GPU that passes through an "LSPCON" chip to convert it to HDMI 2.0.  The reason for this is that current Intel GPUs don't have native support for HDMI 2.0, but the problem is that DisplayPort 1.2 doesn't have enough bandwidth for 4K 60 Hz HDR, at least not without reducing chroma subsampling from the 4:4:4 norm for PCs, but I don't know if there's a way to do that on that system/Intel GPU.  All that said, if you decide to return the system, be aware that you are likely to encounter this limitation on several other systems, because even among systems with dual GPUs, in many cases most or even all of the display outputs are still wired to the Intel GPU.  Gaming-oriented laptops are sometimes the exception, although even they typically don't have all outputs wired to the discrete GPU.  I don't know when Intel GPUs will provide native support for HDMI 2.0.  However, some of the new Core 10th Gen CPUs like the versions included in the brand new XPS 13 use Intel's new Gen 11 GPU that supports DisplayPort 1.4, which DOES support enough bandwidth for 4K 60 Hz HDR at 4:4:4.  But unfortunately not all Core 10th Gen CPUs will include that GPU, and right now the higher performance H Series CPUs used in the XPS 15 model (as opposed to the lower per U Series CPUs used in the XPS 13) aren't expected to get the Gen 11 GPU even when the 10th Gen versions of those CPUs are released.  And if the DisplayPort 1.4 interface was wired to a USB-C output rather than a built-in HDMI 2.0 port, you'd need a USB-C to HDMI 2.0 dongle that specifically supported DisplayPort 1.4 rather than only accepting a 1.2 signal, and I haven't seen those yet -- possibly because there simply hasn't been a need for them yet given that Intel GPUs supporting DisplayPort 1.4 are only now hitting the market.

Thanks much for the reply and technical explanation. I assume XPS desktops with dedicated Nvidia 1660ti and better graphics cards would be able to pass 4K 60Hz HDR thru their own HDMI outputs. If that's the case then a return and repurchase is my best option.

P.S. I forgot to add that 4k 60Hz HDR content on a memory card or USB stick CAN be shown on the internal display but not from HDMI or evidently Thunderbolt 3.

@Kouiouiif the desktop GPU had native HDMI 2.0 outputs, then yes it should be able to pass 4K 60 Hz HDR, because in that case obviously the NVIDIA GPU has direct control of the display outputs since they're part of the GPU board.

The system's Thunderbolt 3 interface is fed by two DisplayPort 1.2 interfaces, which together could certainly run a 4K 60 Hz HDR display, but Intel GPUs do not support using multiple interfaces to drive a single display.  The fact that both interfaces are being carried over the same cable doesn't matter in this case since that "multiplexing" only happens at the Thunderbolt 3 controller chip.  There are still two separate DisplayPort 1.2 interfaces actually coming from the GPU.  This is actually why Intel GPUs currently don't support 5K displays.  5K 60 Hz requires more bandwidth than a single DisplayPort 1.2 interface can provide, so very early 5K displays actually required two separate DisplayPort cables to be connected.  Some 5K displays instead use Thunderbolt 3 now, but again that's essentially the same thing except both interfaces are on the same cable, so Intel GPUs still can't work with them.  Nowadays there's DisplayPort 1.3 and 1.4, which DOES carry enough bandwidth for 5K 60 Hz on a single interface, and I believe some newer 5K displays support that (especially since Thunderbolt 3 is relatively rare especially on desktops, whereas DP 1.3 or 1.4 is relatively common on desktops now), but Intel GPUs currently don't support anything newer than DisplayPort 1.2, so once again they're locked out of using 5K displays -- for now, anyway.  Sorry for the digression there, but I figured you might find the technical explanation illuminating.