M1 MacBook Pro Big Sur and LG 34WK95U sleep wake up issues.

[xszuflax]

Hello,

I'm facing a pretty annoying issue with the external monitor LG 34" 5K LG 34WK95U. At first, I could not get it to run 5K at all it was stuck at some wired 3xxx x 1440. What solved the issue was to downgrade the DP protocol from 1.4 to 1.2 and now it works with 5120x2160 but only when it wakes up ... I like to work in closed-display mode. I use BookArc from Twelve South. Every time I wake up my MacBook Pro from sleep by clicking the mouse or keyboard monitor does not wake up. Something happens because I can see the monitor backlight goes on and it searches for the video source but eventually, it fails and goes back to sleep. I eventually gave up and I'm using this thing open.

I know that there are firmware updates for LG monitors and one could apply these with a software called LG OnScreen Control which can be downloaded directly from lg.com. The software never worked on macOS though. I tried with Catalina on several occasions with different LG monitors like LG 27UK850-W and LG 34WK95U there were a bunch of wired errors or the app was saying that the firmware is up to date. This software does not work on Big Sur just yet.

Today I set up a Windows 10 laptop and installed an LG OnScreen Control. I connected my 34WK95U via USB-B as an upstream instead of USB-C and HDMI for video. To my surprise, it detected a firmware update! I was updated from 3.11,0,2.xx to 4.12, 16, 4.17. The update process took very long, about 45 min. I did a factory reset on my 34WK95U and connected it back to M1 MacBook Pro.

The thing now works over Display Port 1.4 in full 5K. Previously I could run 5K only in DP 1.2. I can also enable HDR. The effectively scaled res is 3008x1269 instead of 3360x1417 like on my previous MacBook Pro (2018) and from what I learned from this forum this is caused by M1 limitation. I can live with that. Obviously, you could use native 5120x2160 but this is a bit too much IMO.

The firmware update brought a slew of new issues though... now my M1 MacBook Pro has issues with waking the external display even in the normal opened lid mode. It happens every so often that the internal display wakes up but the LG 34WK95U is in kinda zombie state. LG backlight starts MacBook detects the external display and rearranges screens but the external monitor stays black with backlight one. The cursor can move over to the external screen. I can see both in the "About mac.." menu. Sometimes it helps to power off the monitor or re-plug the cable but it already happened twice in the past 24h that nothing but reboot solved the issue. I downgraded to DP 1.2 but it does not make any difference.

The setup is: MPB(M1) <Thunderbolt 3 Cable> Elgato Pro Dock <Thunderbolt 3 Cable> LG 34WK95U. It worked just fine with my Intel MacBook Pro (2018) so I assume that the cabling and the dock are OK.

Any idea?

Best,

Marcin Tomków

 

[avonord]

You almost had me getting a windows laptop to install the firmware. But then I saw all the problems you have. I do have some of them, but not as severe.

In the past week, it happened twice that the display woke up to a lower 3k x 1.5k resolution. Turning off/on the monitor fixed the issue. I think one time, the monitor refused to wake, and I had to reboot.

 

[xszuflax]

So the issue is even worst now... when the monitor is set to Display Port 1.4 it can display 5K (5120×2160) but very often when waking up form the sleep it causes the whole OS to crash and reboot with 1s blue to green screen...

In 1.2 it is kinda mixed bag. Some times it is OK, sometimes it does not wake up, some times it defaults to 2560x1080 when woken up and sometimes it goes to the some wired stage that it is in 2560x1080 but the display does not fit the screen like parts (bottom right) is out of the screen . I also count the monitor to randomly wake up - just the monitor and when waken up in that state it boots up in non 5K 3xxx x 1440.

I gotta say this is an adventure ...

 

[pgib]

There seems to be all sorts of issues with either Big Sur and/or M1 Macs with external displays. Every morning, my LG 4K won't turn on because the HDMI port on my M1 Mac mini is dead. Restarting fixes it 100% of the time.

If anyone experiencing such issues can log a report at https://feedbackassistant.apple.com/, hopefully it will be what's needed for Apple to spend some serious time looking into and fixing these issues.

 

[avonord]

I reported my problem to apple, and their engineering team contacted me for logs, etc. Absolutely, contact apple if u could.

 

[xszuflax]

Hello,

I actually did post the issue and all the system diags via https://feedbackassistant.apple.com two days ago.

This morning I was welcomed with the crash. The laptop crashed during the night on its own. After the crash, the monitor powered up in a wired 3440x1440, not 5K! resolution and the picture was blurry. Reboot fixed the issue but all the settings ware wiped and I had to rearrange monitor settings like placement, default monitor and resolution...

 

[fantasydisc]

I don't really think the issue is Macbook M1, I think it's the screen. I've had multiple MacBook Pro's all having issues with the LG 34WK95U. I've had Macbook 15 2019, Macbook 13 2020 I7. Always have problems with waking the screen up after sleep so I have to restart the computer. I have decided to never ever buy a LG product because of this.

 

[xszuflax]

I had Intel MacBook Pro 13" i7 2018 and it was working pretty stable on Catalina but it is true that LG seems to be "popular" when it comes to issues with M1 and all Macs.

Did you found an alternative which is comparable or even better than 34WK95U?

 

[bill-p]

That sounds like a lot of issues. Maybe the Thunderbolt 3 controller is faulty on your monitor? Have you tried contacting LG about this?

Mine has been rock solid... and waking up works all the time. This monitor has gone through 13" 2018, 16" and now the 13" Pro M1. With DisplayPort 1.2, it always remembers the right resolution and always wakes up to that resolution without fail. I have a hub connected to the monitor that also connects my printer, 10gbps ethernet, DAC -> speaker setup, and the only problem I've had so far is the very occasional dropout of the DAC module, so I have to reselect it in Sound Output.

But seriously, "it just works" is how it is for me. Maybe when/if we get 3360x1417 as a scaled resolution option, then this will be perfect, but it's relatively painless for me to use.

P.S.: I see that you have an Elgato Pro Dock in between. Have you tried just connecting straight to the monitor via Thunderbolt 3 and just use a USB 3.0 hub from the monitor?

 

[xszuflax]

That sounds like a lot of issues. Maybe the Thunderbolt 3 controller is faulty on your monitor? Have you tried contacting LG about this?

Mine has been rock solid... and waking up works all the time. This monitor has gone through 13" 2018, 16" and now the 13" Pro M1. With DisplayPort 1.2, it always remembers the right resolution and always wakes up to that resolution without fail. I have a hub connected to the monitor that also connects my printer, 10gbps ethernet, DAC -> speaker setup, and the only problem I've had so far is the very occasional dropout of the DAC module, so I have to reselect it in Sound Output.

But seriously, "it just works" is how it is for me. Maybe when/if we get 3360x1417 as a scaled resolution option, then this will be perfect, but it's relatively painless for me to use.

P.S.: I see that you have an Elgato Pro Dock in between. Have you tried just connecting straight to the monitor via Thunderbolt 3 and just use a USB 3.0 hub from the monitor?

Hey, I posted an LG support query today. Let's see what they have to say about the issue.

The whole setup, exactly the same cabling etc used to work with my previous MacBook Pro 13" i7 2018. I tried to skip the Elgato Dock Pro but nothing changed.

May I know what firmware version you are running on your monitor and maybe the settings you use?

My ones are:

Input:
- Input List: Thunderbolt
- Aspect Ratio: Original

Picture:
- DCI-P3
- Picture Adjust
- Brightness: 75

General:
- SMART ENERGY SAVING: off
- Power LED: Off
- Display Port: 1.2
- Local Dimming: Off
- Buzzer: Off
- OSD Lock: Off
- USB Upstream: USB-C

Some options are greyed out as a consequence of my settings.

FW: 4.12, 16, 4.17

 

[bill-p]

Yeah, my settings are similar to yours. I just use auto brightness, but other than that, everything else is about the same.

How do I check the firmware again? I don't think it's showing in the settings menu on the display.

And I don't think I can get the LG OnScreen Control software to work on Big Sur with M1 either, but I only have an M1 Mac now.

Perhaps I can borrow an Intel Mac Mini not running Big Sur to check...

 

[xszuflax]

Yeah, my settings are similar to yours. I just use auto brightness, but other than that, everything else is about the same.

How do I check the firmware again? I don't think it's showing in the settings menu on the display.

And I don't think I can get the LG OnScreen Control software to work on Big Sur with M1 either, but I only have an M1 Mac now.

Perhaps I can borrow an Intel Mac Mini not running Big Sur to check...

The only way I know is to use LG OnScreen Control which does not work on Big Sur so Windows or Catalina ...

 

[xszuflax]

I'm testing this just for the past 24 hours but when the "Prevent computer from sleeping automatically when the display is off" is enabled in the macOS  > System Preferences > Battery the monitor seems to be much more stable. It woke up 100% obviously not in close lid mode

 

[joevt]

I recall that the 34WK95U-W display is a bit strange. I believe it has a DisplayPort 1.2 dual link SST mode (two DisplayPort connections of 2560x2160) and a single link SST DisplayPort 1.4 mode (5120x2160). So it may have issues like the LG UltraFine 5K (dual link SST) or it may have issues like a 5Kx1440 display (single link SST) or both.

Maybe consider bypassing the Thunderbolt connection (which either does dual link SST or single link SST) and just use a DisplayPort 1.4 connection which can only do single link SST?

The Apple Pro Display XDR is similar. It supports DisplayPort 1.4 HBR2 + DSC single link SST connection, and a DisplayPort 1.4 HBR3 dual link SST connection for GPUs that don't have DSC. But I guess Apple has done more testing with the XDR than with third party displays like the 34WK95U-W.

 

[xszuflax]

Hello,

the problem is that M1 Macs or macOS Big Sur do not support Display Port 1.4 well although the spec says they do... It is explained in detail in https://forums.macrumors.com/threads/m1-mbp-lg-34-inch-ultra-wide-5k2k.2267299/ . Basically one will not be able to run the monitor in 5K 2K when connected over DP 1.4 but... when I updated the monitor firmware I was able to although many OS crashes occurred during display wakeups.

Like I mentioned I use Elgato Pro Dock which can do 5K over Thunderbolt only and TBH I do not want to connect t cables to my MacBook it should all work over Thunderbolt 3.

I do not have USB-C to DisplayPort hand to try DP 1.4 directly form the monitor :-/ Maybe I will borrow one just to test what you are saying,

Thank you!

 

[xszuflax]

Hello @joevt

I just ran your script and this is what I got. I'm not sure what tiled means in this set is it the same as HiDPI?

MacBook-Pro:Downloads mtomkow$ ./M1MacTimings.sh

disp0:
    2560x1600@60.000Hz 100.920kHz 266.63MHz  h(8 32 42 +)  v(32 8 42 +)   (preferred)

dispext0:
    640x480@60.000Hz 0.000kHz 0.00MHz  h(16 64 80 -)  v(3 4 13 +)   (virtual)
    800x600@60.000Hz 0.000kHz 0.00MHz  h(32 80 112 -)  v(3 4 17 +)   (virtual)
    1024x768@60.000Hz 0.000kHz 0.00MHz  h(48 104 152 -)  v(3 4 23 +)   (virtual)
    1280x720@60.000Hz 0.000kHz 0.00MHz  h(64 128 192 -)  v(3 5 20 +)   (virtual)
    1280x768@60.000Hz 0.000kHz 0.00MHz  h(64 128 192 -)  v(3 7 20 +)   (virtual)
    1280x1024@60.000Hz 0.000kHz 0.00MHz  h(80 136 216 -)  v(3 7 29 +)   (virtual)
    1400x1050@60.000Hz 0.000kHz 0.00MHz  h(88 144 232 -)  v(3 4 32 +)   (virtual)
    1680x1050@60.000Hz 0.000kHz 0.00MHz  h(104 176 280 -)  v(3 6 30 +)   (virtual)
    1600x1200@60.000Hz 0.000kHz 0.00MHz  h(112 168 280 -)  v(3 4 38 +)   (virtual)
    1920x1080@60.000Hz 0.000kHz 0.00MHz  h(128 200 328 -)  v(3 5 32 +)   (virtual)
    1920x1200@60.000Hz 0.000kHz 0.00MHz  h(136 200 336 -)  v(3 6 36 +)   (virtual)
    2048x1536@60.000Hz 0.000kHz 0.00MHz  h(152 224 376 -)  v(3 4 49 +)   (virtual)
    2560x1440@60.000Hz 0.000kHz 0.00MHz  h(192 272 464 -)  v(3 5 45 +)   (virtual)
    2560x1600@60.000Hz 0.000kHz 0.00MHz  h(192 280 472 -)  v(3 6 49 +)   (virtual)
    3840x2160@60.000Hz 0.000kHz 0.00MHz  h(312 424 736 -)  v(3 5 69 +)   (virtual)
    4096x2160@60.000Hz 0.000kHz 0.00MHz  h(8 32 40 +)  v(48 8 6 -)   (virtual)
    5120x2160@60.000Hz 0.000kHz 0.00MHz  h(8 32 40 +)  v(48 8 6 -)   (virtual)
    5120x2880@60.000Hz 0.000kHz 0.00MHz  h(48 32 80 +)  v(3 5 74 -)   (virtual)
    800x600@60.000Hz 0.000kHz 0.00MHz  h(40 128 88 +)  v(1 4 23 +)
    640x480@60.000Hz 31.500kHz 25.20MHz  h(16 96 48 -)  v(10 2 33 -)
    1024x768@60.000Hz 0.000kHz 0.00MHz  h(24 136 160 -)  v(3 6 29 -)
    1920x1080@60.000Hz 67.500kHz 148.50MHz  h(88 44 148 +)  v(4 5 36 +)   (preferred)
    3440x1440@59.973Hz 88.819kHz 319.75MHz  h(48 32 80 +)  v(3 10 28 -)   (preferred)
    1920x1080@59.940Hz 67.433kHz 148.35MHz  h(88 44 148 +)  v(4 5 36 +)   (preferred)
    1280x720@59.940Hz 44.955kHz 74.18MHz  h(110 40 220 +)  v(5 5 20 +)   (promoted)
    1280x720@60.000Hz 45.000kHz 74.25MHz  h(110 40 220 +)  v(5 5 20 +)   (promoted)
    720x480@59.940Hz 31.469kHz 27.00MHz  h(16 62 60 -)  v(9 6 30 -)   (promoted)
    720x480@60.000Hz 31.500kHz 27.03MHz  h(16 62 60 -)  v(9 6 30 -)   (promoted)
    640x480@59.940Hz 31.469kHz 25.17MHz  h(16 96 48 -)  v(10 2 33 -)
    3440x1440@49.987Hz 73.681kHz 265.25MHz  h(48 32 80 +)  v(3 10 21 -)   (promoted)
    3840x2160@59.997Hz 133.312kHz 533.25MHz  h(48 32 80 +)  v(3 5 54 -)   (promoted)
    3840x2160@29.981Hz 65.688kHz 262.75MHz  h(48 32 80 +)  v(3 5 23 -)
    2560x2160@59.978Hz 133.272kHz 362.50MHz  h(48 32 80 +)  v(3 10 49 -)   (preferred)
    1600x600@60.317Hz 37.879kHz 80.00MHz  h(80 256 176 +)  v(1 4 23 +)   (tiled)
-> 5120x2160@59.978Hz 133.272kHz 725.00MHz  h(96 64 160 +)  v(3 10 49 -)   (preferred) (tiled)

 

[AndyS2K]

Same problem using Mac mini M1 and LG Ultrawide. The only solution is to power on the monitor first and then exit from sleep the Mac mini m1. So the resolution is correct and also the dpi. If I try to exit the sleep the Mac mini before the monitor strange resolution of 3000 come and all is blurry
I'm here to decide if give away the monitor

 

[joevt]

I just ran your script and this is what I got. I'm not sure what tiled means in this set is it the same as HiDPI?

MacBook-Pro:Downloads mtomkow$ ./M1MacTimings.sh

dispext0:
    3840x2160@60.000Hz 0.000kHz 0.00MHz  h(312 424 736 -)  v(3 5 69 +)   (virtual)
    4096x2160@60.000Hz 0.000kHz 0.00MHz  h(8 32 40 +)  v(48 8 6 -)   (virtual)
    5120x2160@60.000Hz 0.000kHz 0.00MHz  h(8 32 40 +)  v(48 8 6 -)   (virtual)
    5120x2880@60.000Hz 0.000kHz 0.00MHz  h(48 32 80 +)  v(3 5 74 -)   (virtual)
    3440x1440@59.973Hz 88.819kHz 319.75MHz  h(48 32 80 +)  v(3 10 28 -)   (preferred)
    3440x1440@49.987Hz 73.681kHz 265.25MHz  h(48 32 80 +)  v(3 10 21 -)   (promoted)
    3840x2160@59.997Hz 133.312kHz 533.25MHz  h(48 32 80 +)  v(3 5 54 -)   (promoted)
    3840x2160@29.981Hz 65.688kHz 262.75MHz  h(48 32 80 +)  v(3 5 23 -)
    2560x2160@59.978Hz 133.272kHz 362.50MHz  h(48 32 80 +)  v(3 10 49 -)   (preferred)
    1600x600@60.317Hz 37.879kHz 80.00MHz  h(80 256 176 +)  v(1 4 23 +)   (tiled)
-> 5120x2160@59.978Hz 133.272kHz 725.00MHz  h(96 64 160 +)  v(3 10 49 -)   (preferred) (tiled)

Tiled is not related to HiDPI. HiDPI just means everything is drawn twice as wide and tall as the corresponding "low resolution" (not HiDPI) mode.

Tiled means the display uses two DisplayPort signals - one for the left half of the display and one for the right half of the display. In the case of 5120x2160, the two signals are 2560x2160.

I have no idea why there's a 1600x600 tiled mode - that's not even the same ratio as 5120x2160. It appears to be created by doubling the width of one of the established timings in the EDID:
800x600 60.317 Hz 4:3 37.879 kHz 40.000 MHz (DMT)
but it doesn't do the same for the other established timings:

Established Timings I & II
    640x480    59.940 Hz   4:3    31.469 kHz  25.175 MHz (DMT)
    800x600    60.317 Hz   4:3    37.879 kHz  40.000 MHz (DMT)
   1024x768    60.004 Hz   4:3    48.363 kHz  65.000 MHz (DMT)
Standard Timings
   1152x864    59.959 Hz   4:3    53.783 kHz  81.750 MHz (EDID 1.4 source: CVT)
   1152x864    60.000 Hz   4:3    53.700 kHz  81.624 MHz (EDID 1.3 source: GTF)
   1280x1024   60.020 Hz   5:4    63.981 kHz 108.000 MHz (DMT)
   1280x720    60.000 Hz  16:9    45.000 kHz  74.250 MHz (DMT)
   1600x900    60.000 Hz  16:9    60.000 kHz 108.000 MHz (DMT, RB)
   1920x1080   60.000 Hz  16:9    67.500 kHz 148.500 MHz (DMT)
   1280x800    59.810 Hz  16:10   49.702 kHz  83.500 MHz (DMT)

Apple should open source some of this display stuff so people can fix it.

 

[xszuflax]

Finally, I had a chance to try out close lid mode on my work LG 27UK850-W working over the same Elgato Pro Dock and Display Port 1.2 the connection goes like MPB(M1) <Thunderbolt 3 Cable> Elgato Pro Dock <Display Port to Display Port> LG 27UK850-W

$ ./M1MacTimings.sh

disp0:
    2560x1600@60.000Hz 100.920kHz 266.63MHz  h(8 32 42 +)  v(32 8 42 +)   (preferred)

dispext0:
    640x480@60.000Hz 0.000kHz 0.00MHz  h(16 64 80 -)  v(3 4 13 +)   (virtual)
    800x600@60.000Hz 0.000kHz 0.00MHz  h(32 80 112 -)  v(3 4 17 +)   (virtual)
    1024x768@60.000Hz 0.000kHz 0.00MHz  h(48 104 152 -)  v(3 4 23 +)   (virtual)
    1280x720@60.000Hz 0.000kHz 0.00MHz  h(64 128 192 -)  v(3 5 20 +)   (virtual)
    1280x768@60.000Hz 0.000kHz 0.00MHz  h(64 128 192 -)  v(3 7 20 +)   (virtual)
    1280x1024@60.000Hz 0.000kHz 0.00MHz  h(80 136 216 -)  v(3 7 29 +)   (virtual)
    1400x1050@60.000Hz 0.000kHz 0.00MHz  h(88 144 232 -)  v(3 4 32 +)   (virtual)
    1680x1050@60.000Hz 0.000kHz 0.00MHz  h(104 176 280 -)  v(3 6 30 +)   (virtual)
    1600x1200@60.000Hz 0.000kHz 0.00MHz  h(112 168 280 -)  v(3 4 38 +)   (virtual)
    1920x1080@60.000Hz 0.000kHz 0.00MHz  h(128 200 328 -)  v(3 5 32 +)   (virtual)
    1920x1200@60.000Hz 0.000kHz 0.00MHz  h(136 200 336 -)  v(3 6 36 +)   (virtual)
    2048x1536@60.000Hz 0.000kHz 0.00MHz  h(152 224 376 -)  v(3 4 49 +)   (virtual)
    2560x1440@60.000Hz 0.000kHz 0.00MHz  h(192 272 464 -)  v(3 5 45 +)   (virtual)
    2560x1600@60.000Hz 0.000kHz 0.00MHz  h(192 280 472 -)  v(3 6 49 +)   (virtual)
    3840x2160@60.000Hz 0.000kHz 0.00MHz  h(312 424 736 -)  v(3 5 69 +)   (virtual)
    4096x2160@60.000Hz 0.000kHz 0.00MHz  h(8 32 40 +)  v(48 8 6 -)   (virtual)
    5120x2160@60.000Hz 0.000kHz 0.00MHz  h(8 32 40 +)  v(48 8 6 -)   (virtual)
    5120x2880@60.000Hz 0.000kHz 0.00MHz  h(48 32 80 +)  v(3 5 74 -)   (virtual)
    800x600@60.000Hz 0.000kHz 0.00MHz  h(40 128 88 +)  v(1 4 23 +)
    640x480@60.000Hz 31.500kHz 25.20MHz  h(16 96 48 -)  v(10 2 33 -)
    1024x768@60.000Hz 0.000kHz 0.00MHz  h(24 136 160 -)  v(3 6 29 -)
    1280x1024@60.000Hz 0.000kHz 0.00MHz  h(48 112 248 +)  v(1 3 38 +)
    1280x720@60.000Hz 45.000kHz 74.25MHz  h(110 40 220 +)  v(5 5 20 +)   (promoted)
    1600x900@60.000Hz 0.000kHz 0.00MHz  h(24 80 96 +)  v(1 3 96 +)
    1920x1080@60.000Hz 67.500kHz 148.50MHz  h(88 44 148 +)  v(4 5 36 +)   (preferred)
    1280x800@60.000Hz 0.000kHz 0.00MHz  h(48 32 80 +)  v(3 6 14 -)
-> 3840x2160@59.997Hz 133.312kHz 533.25MHz  h(48 32 80 +)  v(54 5 3 -)   (preferred)
    3840x2160@30.000Hz 66.660kHz 266.64MHz  h(8 144 8 +)  v(54 5 3 -)   (promoted)
    1920x1080@59.940Hz 67.433kHz 148.35MHz  h(88 44 148 +)  v(4 5 36 +)   (preferred)
    1280x720@59.940Hz 44.955kHz 74.18MHz  h(110 40 220 +)  v(5 5 20 +)   (promoted)
    720x480@59.940Hz 31.469kHz 27.00MHz  h(16 62 60 -)  v(9 6 30 -)   (promoted)
    720x480@60.000Hz 31.500kHz 27.03MHz  h(16 62 60 -)  v(9 6 30 -)   (promoted)
    640x480@59.940Hz 31.469kHz 25.17MHz  h(16 96 48 -)  v(10 2 33 -)
    2560x1440@59.951Hz 88.787kHz 241.50MHz  h(48 32 80 +)  v(3 5 33 -)

Does not work :/ it is better than LG 34WK95U cuz it woke up 2 times but most of the time it does not :-/ This was working just fine on my MacBook Pro 13" 2018 Intel.

 

[kat2021]

Same problem using Mac mini M1 and LG Ultrawide. The only solution is to power on the monitor first and then exit from sleep the Mac mini m1. So the resolution is correct and also the dpi. If I try to exit the sleep the Mac mini before the monitor strange resolution of 3000 come and all is blurry
I'm here to decide if give away the monitor

I have 34"LG (LGWK95U-W) connected to M1 MAC mini via thunderbolt that was randomly coming out of sleep mode in bad resolution. I couldn't recreate the problem consistently so was having to reboot every time this happened or turn monitor on/off like you. I spent several hours on phone today with Apple and they thought they had resolved issue, but of course, as soon as you are off the phone, it happens again. Next step they told me would be to reinstall the OS and if still issues then to go back to LG. I love this monitor and I'm just not buying that this is a monitor issue.

So I played around until I could recreate the problem consistently. It occurs every time I try to wake the mini using trackpad after 7 clicks (relatively quickly spaced) but if I do two clicks at a time with a pause between them and keep repeating until monitor is fully on (not just the initial glow), the mini wakes up and the monitor wakes up with the proper resolution, at least every time I've tried since this discovery. Pretty slow to wake up though. Stupid work around but sure beats another two hours on the phone with 3 different apple consultants. So far only tested with trackpad connected via one of the two USBs on mini. For now I'm going to keep the trackpad wired.

I suspect this monitor resolution issue is also tied to the problem people are having with Apple keyboard and/or trackpad not waking up mini properly. I'm keeping my Apple keyboard on bluetooth and Apple trackpad connected by wire until I can work through all the other M1 issues I'm having...

Same problem using Mac mini M1 and LG Ultrawide. The only solution is to power on the monitor first and then exit from sleep the Mac mini m1. So the resolution is correct and also the dpi. If I try to exit the sleep the Mac mini before the monitor strange resolution of 3000 come and all is blurry
I'm here to decide if give away the monitor

 

[suxus]

Hi there
I also have the problem with my Macbook Pro and the LG 34WK95U-W. Since my Macbook is almost always on the power (Monitor -> Thunderbolt to -> CalDigit -> Thunderbolt to -> MacBook) is my current workaround , i have deactivated the standby (with power supply). So the Macbook never goes into standby and thus does not lose the resolution setting. Of course, it's not very nice when a Macbook not goes into the standby, but until Apple has a working solution, there isn't much else to do.
Greeting

 

[zaph47]

I'm installing 11.2 now...praying it fixes...will know tonight

 

[ROMAR]

It is not solved.....

 

[zaph47]

It is not solved.....

 

[xszuflax]

Yeah, same here. I would say this is even a bit worst since in DP 1.4 the monitor does not wake up even with the lid open it has to be on DP 1.2 to work.

I was also hoping that the new LG's OnScreen Control 4.48 would help but no dice :-/

The env is stable with lid open and DP 1.2 and it wakes up 10/10 in 5K2K but I miss my vertical dock so much.