MacBook – Siri Window is not in native resolution when connecting external monitor to MBP

displayhigh sierramacbook prosiri

When using Siri on my 2017 MBP running macOS High Sierra, I noticed that the text in the window is not sharp..

The text and image are not sharp and it feels as if low-resolution images/text have been upscaled for Retina size.

On trying to find if this was an issue with my display, I disconnected my external monitor and it seems that connecting a Non-Retina external display is causing this.

Here is a side-by-side comparison of the same screen grab once with the display connected and once without.

No Monitor Connected

Monitor Connected

The Siri window is being opened on the laptop display and not the external monitor. My display resolution is unchanged between the 2 scenarios.

I do not have access to a High Dpi external monitor to check if the issue is present in that scenario as well.

Is this a bug? How can I try to fix this?

Best Answer

Maybe your should try updating the macOS Mojave. If you don't want to for now,

Did you try resetting the NVRAM and SMC? https://support.apple.com/en-us/HT204063
Try using Onyx to clean application and system caches and reboot.

Let me know if that works.

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MacBook – External monitor viewport appear shrunk in native resolution on MBP

I had precisely the same issue, and so did this poster: External monitor randomly lowers resolution adds black borders

the answer in both cases was to switch out the VGA cable.

MacBook Pro no longer outputs native resolution to external monitor when rotation is on

I had exactly the same problem, with the same monitor, Dell U2713 / U2713H / U2713HM / U2713HMt. I had two of them plugged in to my late-2014 Retina Macbook Pro 15" and only one was experiencing the problem. I tried 100s of different solutions (I can say for sure it's definitely not the cable!) and nothing worked. Just like you, I could get landscape 2560x1440 but not portrait. And I was getting the same error WindowServer: description_for_mode_number: IOFBGetPixelInformation failed (-536870206) when I tried to switch to portrait. That is, until I came across this: https://discussions.apple.com/thread/5485930?start=0&tstart=0. I regenerated the EDID override for the screen using the Ruby script, copied it into the correct location, rebooted and now it works again. I think I caused the problem by playing a game (Trine 2) in vertical (720x1280) resolution - after that, I tried everything to get the screen back to displaying portrait 1440x2560 but to no avail. Until I got the Ruby script from the thread above which fixed it.

Just to note, in case the linked thread disappears... the override file is in /System/Library/Displays/Overrides/ under the folder DisplayVendorID-10ac which is for Dell displays. The file for the U2713-series of monitors (and I think the U2711-series too) is DisplayProductID-4080. The contents of the file should be:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
  <key>DisplayProductName</key>
  <string>Dell U2713HMt</string>
  <key>IODisplayEDID</key>
  <data>AP///////wAQrIBATDA1NB4WAQSlPCJ4Iku1p1ZLoyUKUFSlSwCBALMA0QBx
T6lAgYABAQEBVl4AoKCgKVAwIDUAVVAhAAAaAAAA/wBHSzBLRDI3TjQ1MEwK
AAAA/ABERUxMIFUyNzEzSE0KAAAA/QAxVh1xHgEKICAgICAgAA0=
</data>
  <key>DisplayVendorID</key>
  <integer>4268</integer>
  <key>DisplayProductID</key>
  <integer>16512</integer>
</dict>
</plist>

Best Answer

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