Re: No Signal Going To Sleep Fujitsu Monitor
Monnie Trbovich
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I've had this problem from Day 1 with a Mac Mini M1 and 2 external monitors - I started at 11.1 and 6 months later I'm now at 11.5.1 and there is no change. They did fix the bluetooth disconnect problem with 11.4 though. I've been through to third line at Apple. They promised a call back over the weekend but didn't bother to call despite booking it in with me. It's a major problem as the windows all move towards the primary monitor on every sleep. Sometimes they get there. Sometimes they end up off the screen. Workflow is considerably worse than on my MBP2012. 11.5 has also broken spotlight so I can't find emails now (I'll start a different thread). Honestly I'm considering a Windows 11 machine. This is the worst functionality I've had in over 30 years.
Thanks Luis but I disagree. This is the same problem. I perhaps didn't explain too well. The secondary monitor frequently doesn't wake up. The primary monitor sometimes doesn't wake up either. Like @contextCue I've tried all the hardware changes. I've even bought an external dock with a display port to see if that would help (it didn't). When neither monitor will come back on you have no option but to take the machine down with a hard reset. If the primary monitor comes up then often (but not always) unplugging the secondary monitor (HDMI into a genuine Apple multi-adaptor) brings up the second monitor. Whether or not the second monitor comes up or not all the windows will have moved as I mentioned above as though the monitor was no longer present. This happens multiple times a day. As I also said above, sometimes the windows have to be found with an F3 as they are off the visible screen. While I admire your faith in Etrecheck for this , I'm pretty sure this is a hardware / firmware problem that has been present from when I plugged the machine in on Day 1 - the monitors are brand new too LG C32R50 . I have a second M1 Mini using different monitors but displaying (or not) the same issues too. I'm happy for you that you have no problems. I have a significant investment which is unfit for purpose.
Only you have access to your mac and can do steps to troubleshoot. If it is a firmware or OS issue, then it is likely to fixed at some point; but if the matter is caused by some third party kernel extension then you will end up in frustration every time a new update comes along and doesn't fix the problem. It is up to you to keep waiting or to do more testing.
The fact that it happens in more than one mac is something that very understandably may convince one that it is a systemic problem; but more often than not similar macs owned by the same person or organization have similar problems - because the installation is also similar or identical. If you had used, say "cleanmymac" on all your macs (just as an example) and all showed problems, it would not mean there was a firmware bug.
Understood - I've removed the Presonus kernel extension as it's not critical on this machine but on the reboot after this removal the secondary screen (HDMI in Apple Multi-adapter) had to be plugged and unplugged to be coaxed into life which doesn't bode well. I'll monitor the situation and compare with the machine with it still in. Both are Mac Mini M1 running 11.5.1
Another couple of days and there is no real difference - it's still Russian Roulette every time the secondary monitor sleeps whether it comes back on on resume or not. Primary Monitor has been OK although I couldn't get into the machine this morning as it wouldn't take the password - I had to take the machine down with a. hard power switch hold. This reminds me on startup, it's a full minute after 'dung' to seeing anything on the primary screen - just in case that chimes with anyone.
For the iMac setting sleep to never is an ok solution... it would certainly be nice if it just worked as intended though, I also have a system76 laptop and an archangel tower and both those machines have no issue.
Just an update - I've had Big Sur 11.5.2 running since the weekend and have only had one failure of the secondary monitor to come up in 4 days. This is a major change from the Russian Roulette every time you walk away from the keyboard. I've noticed that the windows move around more predictably and stay accessible. Chrome always parks itself half way on each monitor, everything else heads to the HDMI direct main screen multiple times a day. So, an improvement from the update with no name. Keep going and with leaving the windows where they I left them though.
A further update - since 11.5.2 I've only had one incidence of secondary monitor not waking up. The open windows still migrate towards the primary monitor and some actually make it. None have manifested off-screen requiring fishing trips to access them. I'll take this as an improvement.
On the downside I've had 3 magic mouse disconnections and two keyboard disconnections which is the first time for quite a while. Not nearly as frequent as they used to be in the early days of Big Sur but enough to be disconcerting. They were both cleared by the "turning it on and off again" process.
I'm on Big Sur 11.5.2 and it has messed up the external connections from my Airbook Pro. It seems to support either an external monitor on the thunderbird port or multiple devices on the usb hub - not both simultaneously. So my advice if you are having problems is to (a) disconnect external hubs or docking stations (b) hope they fix the bug soon.
That's an interesting thought @MartinChuzzlewit - The M1 Mac Mini has been much more stable since 11.5.2 for me - I have a Caldigit TS3 plugged in because er... I need the ports and the Machine doesn't offer them. Way back when I first got the machine, this was the only way I could actually get the two monitors to work at all. One in the HDMI of the Mac Mini and one in the Thunderbolt port of the dock with a multi-adapter. I tried a native HP Display port monitor instead but not a glimmer - Maybe I'll have another go.. I'm also having more luck with Sidecar and my iPAD these days. Maybe 80% first time connection.
Last night, my friend was on their computer running a bunch of applications and according to them, they were filling out an online form when the system appeared to freeze up on them. They tried doing CTRL+ALT+DEL but that did nothing and even the mouse cursor had stopped responding on screen. So, they hit the power button on the computer to force it to shut down which it did. The problem now is, that when powering the computer back on, the monitor remains in sleep mode and does not seem to be receiving a signal from the computer.
Heh. I hate to mention it, but he MIGHT have just unplugged one of the cords by accident. Say, kicked it or something. I like the answer of unplugging power and video cable from the monitor, and plugging that all back in.
Since around the middle of October 2020, my Arch Linux machines don't wake up the monitor anymore when I press any key in the Gnome login screen. However the machine itself is woken up, as I see my keypresses as password entries or am even locked if I press enter due to too many login attempts once I wake the monitor up by switching to another console via CTRL+ALT+Fx and back.
I struggled with a similar problem on a desktop PC with Gnome 3.38 on Wayland for quite some time, the solution was to change the setting "IgnoreLid" to "true" in /etc/UPower/UPower.conf. Desktop PCs don't have a lid, so I think (at least in some cases) the Kernel reports garbage instead of reporting the lid as always open.
EDIT: I was too hasty to declare this as solved. Nope: in half of the cases, especially when sending the PC to suspend right after boot up, the monitor was still going to sleep after waking up for several seconds because of no video signal present.
Anyway, I've spend almost two days trying to find a clean solution, tried playing with DPMS and ACPI, but finally ended up with the following crude workaround: I've installed the ydotool and created a systemd service file /etc/systemd/system/resume_gnome_workaround.service with the following contents:
Then I enabled it with systemctl enable resume_gnome_workaround.service. It simply simulates a mouse movement one second after going from suspend. At least it works for me in 100% of the cases.
This laptop came for repair because of the LCD screen backlight failure. My customer complained that the laptop LCD screen is black but the laptop works with an external monitor.
Here are my steps for troubleshooting this laptop with the backlight failure.
If you have a similar problem, make sure the lid close witch moves freely. The lid switch is a small button located close to the LCD screen. This button triggers the hibernation or sleep mode when the screen is closed. If the lid close switch is dirty, it might get stuck inside the laptop case and cut off the power from the inverter board. The inverter board works as a power supply for the backlight lamp and if there is no power coming to the inverter board, the backlight lamp will not light up either.
Finally, I disconnected the screen backlight lamp connector from the inverter board and connected my test backlight lamp (I removed it from another cracked screen). You can find a new backlight lamp on eBay. Try to find a backlight with the connector already attached to it, so you can plug it into the inverter board. Make sure the connector on the backlight lamp is similar to the connector on your LCD screen.
Wojciech,
It could be just a loose connection on one of the inverter ends. Try reseating these connectors, it might help. Also check connection between the video cable and the motherboard/video card.
You cannot tell with part is failing the inverter board or the backlight lamp without testing the laptop with a known good backlight lamp (or inverter). I think you might have a dead backlight bulb because the laptop was dropped.
Anyways, try reseating cable connections first.