Mac os displayport no signal

Если на компьютере Mac внешний дисплей не определяется или изображение на нем выглядит размытым

Попробуйте выполнить эти действия, если на внешнем дисплее, подключенном к компьютеру Mac, изображение отсутствует или выглядит неправильно.

Подготовка

Убедитесь, что на компьютере Mac установлена последняя версия macOS.

Если на дисплее отсутствует изображение или он не обнаружен

Попробуйте выполнить следующие действия, если на дисплее отсутствует изображение.

Проверьте, сколько дисплеев можно подключить

Количество внешних дисплеев, которые поддерживает компьютер Mac, указано на странице технических характеристик или на вкладке «Поддержка» в разделе «Об этом Mac».

1. Выберите меню Apple  > «Об этом Mac».
2. Перейдите на вкладку «Поддержка» и выберите «Спецификации».
3. На открывшейся странице количество дисплеев, поддерживаемых компьютером Mac, отображается в разделе «Поддерживаемые форматы видео» или «Графика».

Проверьте кабель или адаптер

Отсоедините кабель внешнего дисплея от компьютера Mac, затем снова подсоедините его. Если кабель внешнего дисплея не подключается к портам компьютера Mac, можно воспользоваться адаптером Thunderbolt 3 или USB-C.

Если изображение на дисплее размыто

Если изображения или текст на дисплее выглядят размытыми или мозаичными, проверьте разрешение и яркость дисплея.

Настройка разрешения

1. В меню Apple выберите пункт «Системные настройки».
2. Щелкните значок «Мониторы».
3. Удерживая клавишу Option, выберите вариант «Масштабированное», чтобы посмотреть дополнительные значения разрешения для второго дисплея.
   

Если вы используете несколько дисплеев и видите изображение на одном из них, вы также можете проверить подключенные дисплеи на панели настроек «Мониторы».

Если ожидаемое разрешение дисплея не отображается, проверьте страницу со спецификациями, чтобы узнать, что поддерживает ваш компьютер Mac.

Настройка яркости

Чтобы настроить яркость дисплея Apple, нажмите на клавиатуре клавишу увеличения яркости или клавишу уменьшения яркости .

Также можно регулировать яркость для каждого подключенного дисплея, выбрав «Системные настройки» > «Дисплеи».

Дисплеи сторонних производителей Apple иногда имеют встроенные элементы управления яркостью и цветностью. В документации к дисплею проверьте, имеются ли у него встроенные элементы управления.

Информация о продуктах, произведенных не компанией Apple, или о независимых веб-сайтах, неподконтрольных и не тестируемых компанией Apple, не носит рекомендательного или одобрительного характера. Компания Apple не несет никакой ответственности за выбор, функциональность и использование веб-сайтов или продукции сторонних производителей. Компания Apple также не несет ответственности за точность или достоверность данных, размещенных на веб-сайтах сторонних производителей. Обратитесь к поставщику за дополнительной информацией.

Источник

Question: Q: External monitor gets «No Signal» from DisplayPort with new MBP 15″

I have a weird issue. My «old» computer was a late-2016 MBP with Touch Bar. Just replaced it with an identical 2017 one, same specs (only difference is the Kaby Lake processors), same OS, etc.

When putting it into my setup, using a Thunderbolt 3 -> DisplayPort adapter, a 5 meter cable, into an ASUS PB328q, it gets no signal from the DisplayPort.

When inserting the cable into the adapter, the screen reacts, but still no signal. However, neither the display nor the computer seems to react at all when plugging in the DP-adapter into the computer.

This is really puzzling, as everything is the same (and there was no problem connecting and disconnecting the previous computer)

I feel like I’ve tried everything. Safe mode, reset SMC, NVRAM, unplug cables and wait, connecting them again in all sorts of orders, resetting the display, etc.

HDMI input works however, just not the DP. Any help would be greatly appreciated!

MacBook Pro (15-inch, 2017), iOS 10.3.3

Posted on Jul 20, 2017 7:28 AM

Helpful answers

On my old monitor Dell U3014, I needed to go settings of the monitor (not the laptop) and turn on the DisplayPort 1.2 support which is for some reason disabled by default. To make things worse, the local menu (and not just the input source) on this monitor becomes available only after some valid signal is already coming. Connect some other video source temporarily to it.

My mac is MacBook Pro (15-inch, 2017), OS 10.13.3 (17D102), cable Delock 85256 USB C. The display is Dell U3014, it worked fine with various computers for many years and still does.

HDMI to USB C adapter works with this monitor out of box but for some reason produces really low quality image (something wrong with colours).

Summarising, DisplayPort 1.2 must be supported by the cable and monitor, and also activated on the monitor side.

Mar 21, 2018 1:20 AM

There’s more to the conversation

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Jul 20, 2017 7:35 AM

I have tried two different ones;

Jul 20, 2017 7:56 AM

Displays attached to your Mac require that the display respond to a query sent from the Mac at certain times. The query is essentially, «what is your name, and what are your capabilities?» One of the reasons it is done this way is to avoid sending a signal that might damage your display.

Some displays, especially TV set displays, are internally set to «scan» all their ports looking for one with a signal. If the display is not paying attention to which port it should be listening to, and misses the query and does not respond, it stays dark. So if your display has a setting for which port is preferred, or which port is used to connect to a computer, that is what the display should be set for.

The query is sent:

• at wake from sleep

• At insertion of the Mac-end of the display cable, provided everything on that cable is ready-to-go

• on use of Option-(Detect Displays) button in Displays Preferences

If you can see (on your Internal display) to click option-(Detect Displays), you should also look to see if the NAME of the display is showing:

About This Mac > (System Report) > Graphics&Displays

name not showing means the display did not answer the query.

Occasionally, an inexpensive adapter does not carry the EDID data side channel through to the display and back. Then it will not work properly with a Mac.

Jul 20, 2017 8:30 AM

Yeah, the computer doesn’t react at all on the DP adapter, neither does the display. When connected through HDMI everything is normal. Indeed, it would seem the adapter is the problem, but I dont think thats the case.

The very strange thing here is that it worked perfectly with the previous computer, which was identical..

Next step in trouble shooting is to bring another computer with USB-C output and see if it connects..

Jul 20, 2017 8:42 AM

There is a lot more information you can collect. See my post from about the same time as yours.

Jul 20, 2017 9:32 AM

You mean your longer (very informative!) post above? Yes I read it, but since there is no communication between the adapter and the computer at all, there is no such information being sent (I hope this was what you meant)

Key thing seems to be what might have changed between the two otherwise identical computers, dont you think?

So if there is an issue of EDID data not being sent, its still strange that it managed to send it fine with the previous computer, no?

Jul 20, 2017 9:51 AM

Is anything seen at:

About This Mac > (System Report) > Graphics&Displays ??

does that change if you click Option-(Detect displays) and select the report again?

Jul 20, 2017 10:34 AM

Right, no there is no info there about the screen, it doesn’t seem to detect anything at all.

It would be very natural to blame the display, had it not been for the fact that it just used to work before. Of course, coincidences happen, so I’m in touch with ASUS as well to see what may have gone wrong with the DisplayPort..

Jul 21, 2017 1:23 AM

Hi there! Would you mind saying the final outcome of your issue?

I recently purchased a late 2017 MBP for work and am having the same issue. Only difference here is I’m using a straight USB-C to DisplayPort cable (no adapters in between). I’m also on an ASUS monitor, but a different model (PG279Q).

I’m actually on my second cable as I returned the original one I purchased thinking it was defective. I returned that one and bought one that was a different brand. Both had solid reviews and have confirmed to work on these model MBPs. For that reason, I’m ruling out that this is an issue with the cable(s) themselves (what are the odds they’re both defective). FWIW, here’s the cable I’m using now: Amazon.com: USB C to DisplayPort Cable (4K@60Hz), uni Thunderbolt 3 to DisplayPort Cable for MacBook Pro 2017/2016, Dell…

Also worth noting, the display shows up just fine (proper model number and resolution) under About this Mac > Displays as mentioned by another user.

Any guidance on this would be greatly appreciated.

Jan 2, 2018 2:10 PM

I actually have the same issue. Also tried several cables/adaptors and apparently something is wrong with Apple’s soft/hardware here. No matter what adaptor I use, at some point the external monitor stops getting a signal form my MBP (being recognized by the system: I can see it in a display list, the system thinks everything is ok). The only thing that helps me is restarting the laptop (sometimes I need to reload it twice though).

P.S. I have never had an issue with those displays before with my MBP 2012 Retina, it started with MBP 2017 so it seems that something is broken with that thunderbolt 3.

Jan 31, 2018 1:43 AM

I wanted to share this with you and future visitors how I solved my issue: using a different cable. It turns out the quality of the cables on the market are hit or miss.

Here’s the one I’m currently using for over a month now with no issues at all:

I hope this helps!

Feb 25, 2018 5:29 PM

Delock 85256 USB C to DP does not work. It is a good quality 4K cable, and also far from cheap. It is DisplayPort 1.2, should this be a problem? HDMI works with the same monitor but the image quality is pretty bad for some reason.

The Graphic/Displays in system report shows only «Intel built-in graphics» and «PCI Express Radeon graphic card». It does not show any external monitors present. The monitor somewhat senses a laptop (does not complain «cable unplugged), but there is no image. «Displays» setting only shows internal display. I cannot find «Detect displays» anywhere. I tried to plug-unplug cables multiple times, also tried different ports.

My mac is MacBook Pro (15-inch, 2017), OS 10.13.3 (17D102). The display is Dell U3014, it worked fine with various computers for many years and still does.

While it is ok Apple supports only latest versions of some cables, they really should specify these versions rather than making users to buy and probe the random stuff. It is not just about cheap and expensive cables, I have paid $50 for mine.

Mar 21, 2018 12:58 AM

On my old monitor Dell U3014, I needed to go settings of the monitor (not the laptop) and turn on the DisplayPort 1.2 support which is for some reason disabled by default. To make things worse, the local menu (and not just the input source) on this monitor becomes available only after some valid signal is already coming. Connect some other video source temporarily to it.

My mac is MacBook Pro (15-inch, 2017), OS 10.13.3 (17D102), cable Delock 85256 USB C. The display is Dell U3014, it worked fine with various computers for many years and still does.

HDMI to USB C adapter works with this monitor out of box but for some reason produces really low quality image (something wrong with colours).

Summarising, DisplayPort 1.2 must be supported by the cable and monitor, and also activated on the monitor side.

Источник

Question: Q: MacBook won’t detect external display

A bit ago I purchased myself a MacBook Pro 15″ (2016).

I purchased an adapter so I could connect it to my external monitor (which functions perfectly). It was a USB-C to DisplayPort adapter, after which I used a DisplayPort cable to connect it to my external UHD monitor (Philips Brilliance 288P).

The MacBook Pro was running Sierra as operating system, and it recognized the external monitor.

After I went through a bit of technical problems, however. Eventually, my 2016 model got replaced by a brand-new 2017 model. This one shipped with High Sierra, and is now running version 10.13.

Since the «update» to High Sierra (which I cannot revert, since it shipped with this OS X), my MacBook Pro 15″ (2017) does not recognize my external monitor anymore using the exact same method I used before (USB-C to DisplayPort adapter).

The external monitor does not show up in the «display» section, and when connected and turned on simply goes to sleep. Normally it automatically detects a source and switches to that mode, but I also tried manually switching to DisplayPort as an input, after which I immediately receive the message of no signal being found.

I know for sure that the adapter works properly, as I have two of them which both worked before. Little tricks such as trying all USB-C ports, rebooting and reconnecting everything and booting in safe mode are to no use. Since using this new MacBook Pro with High Sierra on it, it simply acts as if my external monitor does not exist.

Does someone have any clue on what to do?

[Re-Titled by Host]

MacBook Pro with Retina display, macOS High Sierra (10.13)

Источник

Sierra/External monitor via DisplayPort/»No signal» after sleep

krapidler

macrumors member

Since installing MacOS Sierra, I’ve had major issues with my external monitor (ACER G227HU), which is connected via MiniDisplayPort-to-DisplayPort cable (no dongle) to my early 2011 13″ MacBook Pro (which is itself in clamshell mode).

Basically every time after going to sleep, the monitor wakes up together with the computer, meaning that the little light next to the monitor’s power key turns blue, but then there is never any image, and after a few seconds the monitor just displays «NO SIGNAL».

Sometimes I can get the monitor to work again by unplugging and replugging the cable, sometimes only after opening the MBP (which is a pain because it sits vertically in a stand 1 meter away), and sometimes I actually need to restart the computer.

Something else I’ve noticed is that DURING sleep, the monitor sometimes goes from being completely black (no backlight) to black backlight, displaying «NO SIGNAL» for a few seconds until it goes back to sleep.

What I’ve tried so far:

• install 10.12.1
• use another (newly bought) MiniDisplayPort to DisplayPort cable
• adjust «energy» times in system preferences so there is no conflict between screensaver, display off and computer off
• reset NVRAM
• reset SMC
• used an HDMI cable instead — this seems to work, but then the Acer monitor won’t work in the monitor’s default resolution (2560*1440) because HDMI doesn’t seem to be able to go that high

Would anyone know what this could be/how to fix it? Happy to upload logs, just let me know what you need exactly and how to find them 😉

Источник