Therefore there are 4 bytes for high and 4 bytes for width which leaves us with a max value of 4096 (8^4). The data field which contains the native resolution is 8 bytes in length for native high and width of the display. Thats not a fault by the manufacturer but a limit of the EDID standard. The EDID of the U4919DW (and likely all other displays with resolutions greater than 4096 pixels ) contains 3840*1080 as the native resolution. This 128 byte long data contains all informations about the display, like manufacturer, serial number, supported "standard" resolution and the native resolution. I did some analysis on that issue and probably found the root cause:ĭisplays communicate with the client by sending an EDID (Extended Display Identification Data). macOS Catalina beta 1 also doesn't seem to fix the issue. Looks like Windows somehow get the full resolution from the display channel or does have a plug & play driver in place - idk. I validated this by installing Windows 10 in BootCamp and I was able to select the full 5120*1440. I also just got my Dell U4919 DW and having the same issues as described here.įirst of all, if you are using the cables provided with the display you should absolutely be able to get the full resolution on supported Mac's (e.g. ge-and-troubleshooting-guide?lang=en#Usi… requirements-and-supported-configuration… Why can't I get full 5k resolution? Is it an issue with the MacBook, the connection, the screen or perhaps an iOS issue?Īdditional links with information on the screen: My MacBook Pro has 4 USB-C ports, I'm using the left ones which operate at full speed (right ones are reduced). "this model supports a maximum resolution up to 4096x2304 at 60 Hz at millions of colors on two external displays or a single external display at a maximum resolution up to 5120x2880 at 60 Hz at over a billion colors via Thunderbolt 3 (USB-C)." I have tried the app SwitchResX to manually set the 5k resolution without luck, only scaled.įrom this link I read about my MacBook before purchasing the screen that: I have just purchased the Dell U4919DW monitor to use with my early 2018 MacBook Pro 13", but unfortunately I cannot choose full resolution 5120x1440 in the settings, max is 3840x1080.
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