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Michel_Lemay
1 Nickel

5520 not working UHD@60hz

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Hi, I just recently got a dell 5520 lapop with integrated Intel HD 630 graphic chipset.

No matter what I try, I can't get it to display 4k@60hz!

Here is the relevant informations:
- Windows 10, 64bits, version 1709 (latest build 16299.19)
- Intel core i7-7820, 32 GB ram
- Intel graphic HD 630, 21.20.16.4664 driver (2017-04-21)
- Monitor: Asus PB287Q (See: PB287Q | Monitors | ASUS USA )

Since the laptop only has a HDMI 1.4 port, I reverted back to using a USB-C to DisplayPort external adapter
USB Type C to DisplayPort adapter (IZEC-A46) which is said to support DP UHD@60hz

When I add UHD@60 resolution to the Intel Graphic Control Panel, It says "bandwidth exceeded"

Any clue?

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jphughan
5 Rhenium

RE: 5520 not working UHD@60hz

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You shouldn't have to add 4K @ 60 Hz resolution manually, so if you don't see it listed, then there's another problem somewhere.  First, that display needs to be manually set to DisplayPort 1.2 mode in its OSD in order to accept 4K @ 60 Hz.  Several displays ship in DP 1.1 mode for compatibility, but that only allows 4K @ 30 Hz.  According to the manual, you'll find that option in the display's menu under System Setup > DisplayPort stream.

If that doesn't fix it, since you're using a USB-C to DisplayPort adapter, have you confirmed that the DisplayPort CABLE you're using can carry 4K @ 60 Hz by testing it with another system?  If not, do that if you can, or get another DisplayPort cable since not all of them can reliably carry 4K @ 60 Hz, and I don't think there are ANY cables longer than 2m/6ft that can.

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jphughan
5 Rhenium

RE: 5520 not working UHD@60hz

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For your work setup, you can't get 4K @ 60 Hz out of the WD15 even for a single display no matter what you do with the cable, because the dock itself is only getting enough total bandwidth to do 4K @ 30 Hz for a single display (or dual 1080p).  That's explained in the specs of the dock.  The TB16 on the other hand can do DUAL 4K @ 60 Hz because it gets 4x the display bandwidth that the WD15 does.  If your "Dell 5520" is a Precision 5520, then yes it supports the TB16 because Thunderbolt 3 comes standard on the 5520 -- but you'll need the version of the TB16 that comes with a 240W adapter, not 180W.  As a general note, it's always a good idea to include the model line of your laptop, not just the model number like "Dell 5520", since sometimes the same model number exist in the Precision, Latitude, and/or Inspiron line, and of course they're all completely different systems, so including the model line avoids confusion.

I wrote a thread about USB-C and Thunderbolt 3 here if you're interested: en.community.dell.com/.../20017807

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5 Replies
jphughan
5 Rhenium

RE: 5520 not working UHD@60hz

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You shouldn't have to add 4K @ 60 Hz resolution manually, so if you don't see it listed, then there's another problem somewhere.  First, that display needs to be manually set to DisplayPort 1.2 mode in its OSD in order to accept 4K @ 60 Hz.  Several displays ship in DP 1.1 mode for compatibility, but that only allows 4K @ 30 Hz.  According to the manual, you'll find that option in the display's menu under System Setup > DisplayPort stream.

If that doesn't fix it, since you're using a USB-C to DisplayPort adapter, have you confirmed that the DisplayPort CABLE you're using can carry 4K @ 60 Hz by testing it with another system?  If not, do that if you can, or get another DisplayPort cable since not all of them can reliably carry 4K @ 60 Hz, and I don't think there are ANY cables longer than 2m/6ft that can.

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jphughan
5 Rhenium

RE: 5520 not working UHD@60hz

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One more thing if you still have trouble even after trying the above suggestions: You're plugging the USB-C to DisplayPort adapter directly into the laptop, correct?  You're not connecting it to any other kind of dongle/dock that's plugged into the USB-C port?  The reason I ask is that USB-C can carry 4K @ 60 Hz only if it is NOT also being used for USB 3.1 traffic.  If you have a device connected to the system's USB-C port that sets it up to deliver display and USB 3.1 traffic simultaneously, then the available display bandwidth gets cut in half, which means you'd only have enough for 4K @ 30 Hz (or 1600p @ 60 Hz).

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Michel_Lemay
1 Nickel

RE: 5520 not working UHD@60hz

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This is interesting.  In my case, I have two setups: work and home.  

@home: direct USB-C to DP using given adapter to Asus PB287Q

@work: laptop -> WD15 -> mDPtoHDMI2 -> Samsung UN40JU6700

Neither setup currently works at 60hz.

About Asus OSD menus, reference is here (page 3-10):  I will definitely try this when I get back home later today.

As for the WD15, I think I either need to change it to a TB16 (if compatible with laptop)  or change the cable as explained here: downloads.dell.com/.../dell-dock-wd15_reference guide2_en-us.pdf

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jphughan
5 Rhenium

RE: 5520 not working UHD@60hz

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For your work setup, you can't get 4K @ 60 Hz out of the WD15 even for a single display no matter what you do with the cable, because the dock itself is only getting enough total bandwidth to do 4K @ 30 Hz for a single display (or dual 1080p).  That's explained in the specs of the dock.  The TB16 on the other hand can do DUAL 4K @ 60 Hz because it gets 4x the display bandwidth that the WD15 does.  If your "Dell 5520" is a Precision 5520, then yes it supports the TB16 because Thunderbolt 3 comes standard on the 5520 -- but you'll need the version of the TB16 that comes with a 240W adapter, not 180W.  As a general note, it's always a good idea to include the model line of your laptop, not just the model number like "Dell 5520", since sometimes the same model number exist in the Precision, Latitude, and/or Inspiron line, and of course they're all completely different systems, so including the model line avoids confusion.

I wrote a thread about USB-C and Thunderbolt 3 here if you're interested: en.community.dell.com/.../20017807

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jphughan
5 Rhenium

RE: 5520 not working UHD@60hz

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Also, note that for your TV, even after you get the correct dock, you'll need to set the "UHD Color" option to On to get a full RGB (4:4:4) signal while using 4K @ 60 Hz, otherwise you'll only get 4:2:0, which won't look as good, or you may get nothing at all.  Additionally, you'll need to make sure that both your DP to HDMI adapter and HDMI cable support HDMI 2.0.  Or actually, the TB16's HDMI port natively supports 4K @ 60 Hz, so you wouldn't even need the DP to HDMI adapter, just an appropriate cable.

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