Debian blackscreen after suspend
Solution 1
I struggled with a similar issue in Debian 9, installed on a Lenovo G40-30 Laptop. I went into Hibernate/Sleep and trying to initiate again the screen didn't show up although everything seemed working.
The solution is actually quite simple. It seems Linux OSs, in particular Debian and Ubuntu need at least a 4+GB swap partition for Hibernate/Sleep to work properly. If you installed with "default" configuration it will create a Swap the same size of your actual RAM (in practice a little less). So if you have a laptop with less or equal to 4 Gb RAM and installed "default" configuration, you are probably trying to solve this issue.
Swap allocation in Linux work in two ways:
-
in the form of a SWAP PARTITION in your hardrive.
-
in the form of a SWAP FILE.
YOU CAN CREATE THE SWAP
FILE AS FOLLOWS:
sudo swapon --show
shows if you have enabled the swap option. If not look up how to do this.
sudo fallocate -l 1G /swapfile
sets the size of the swap you add to 1Gb, change to the value you need.
sudo chmod 600 /swapfile # sets the file to be owned by root
sudo mkswap /swapfile # mkswap tool to allocate swap in the file
sudo swapon /swapfile # activate the swap
sudo nano /etc/fstab # open the file to make changes permanent
Add the line /swapfile swap swap defaults 0 0
to the file /etc/fstab
:
sudo swapon --show # show if its working
sudo free -h # show Memory and Swap
IF YOU WANT TO UNDO CHANGES JUST:
sudo swapoff -v /swapfile
remove the line from /etc/fstab
file: /swapfile swap swap defaults 0 0
sudo rm /swapfile # remove the swap file
SWAP SIZES ACCORDING TO RAM:
I can indicate the following table with some recommended
SWAP
sizes according to your RAM. Last 3 columns are SWAP
spaces:
RAM No hibernation With Hibernation Maximum
1GB 1GB 2GB 2GB
2GB 1GB 3GB 4GB
3GB 2GB 5GB 6GB
4GB 2GB 6GB 8GB
5GB 2GB 7GB 10GB
6GB 2GB 8GB 12GB
8GB 3GB 11GB 16GB
12GB 3GB 15GB 24GB
16GB 4GB 20GB 32GB
24GB 5GB 29GB 48GB
32GB 6GB 38GB 64GB
64GB 8GB 72GB 128GB
128GB 11GB 139GB 256GB
256GB 16GB 272GB 512GB
512GB 23GB 535GB 1TB
1TB 32GB 1056GB 2TB
2TB 46GB 2094GB 4TB
4TB 64GB 4160GB 8TB
8TB 91GB 8283GB 16TB
MORE INFORMATION:
you can find thorough information on recommended SWAP sizes according to your RAM in the following link:
How much swap should I take for 1GB to 8TB of RAM on 14.04 or higher?
Credit is due for the table I added here.
Solution 2
I had a similar issue when resuming from hibernate so here's a broad troubleshooting list of things to check:
Does the keyboard work?
Try hitting CAPSLOCK or NUMLOCK and see if the LED goes on and off.
Is your system running?
Put on some music and see if it resumes.
Can you use the computer?
If both questions above answer positively, chances are that you can use your laptop blindly. Start a terminal and run some commands that output sound to check if it is working. If it does, everything is working except the screen not turning on. This is what I had too.
How I solved it:
What might work as a workaround (but probably not in your case) is to close the laptop and reopen it again. Suspending in general helped me out quite a lot.
If not, try calling xrandr
.
- You can run it through a terminal if you can use the laptop even without any monitor
- Suspend, wait, and then xrandr:
sudo systemctl suspend/hibernate;sleep 60;xrandr
. - Put the command into a systemd service.
Here's mine:
[Unit]
Description=After hibernate
#After=suspend.target
After=hibernate.target
#After=hybrid-sleep.target
[Service]
ExecStart=/usr/bin/xrandr
[Install]
#WantedBy=suspend.target
WantedBy=hibernate.target
#WantedBy=hybrid-sleep.target
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Hans Anders
Updated on September 18, 2022Comments
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Hans Anders almost 2 years
After fully updating my laptop after a few weeks downtime and now the suspend function isn't working anymore. It does suspend my laptop but on the wake-up it only starts the HDD agian but the screen(black screen) and keyboard aren't working or at least I can't see it and trying to increase the brightness won't work.
Does some one have a solution or knows a thread where this question was answered already?
I'm using debian jessie with gnome. Suspend also won't work on any other environment.
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garethTheRed over 9 yearsWhat happens when you press Ctl-Alt-F2 ? Do you get a login prompt?
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Hans Anders over 9 yearsCtrl-Alt-F2 isn't working either.
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garethTheRed over 9 yearsIf you look at your screen at a very shallow angle (tip the screen back and look along the keyboard), do you see anything?
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Hans Anders over 9 yearsIt looks like that after suspend the brightness is the same as 0% brightness when using the keys. I can only see the movement of firefox when alt-tabbing. But the brightness keys still won't work.
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garethTheRed over 9 yearsTry adding
acpi_backlight=vendor
to your kernel boot parameters. -
Hans Anders over 9 yearsAdding acpi_backlight=vendor to grub won't work.
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garethTheRed over 9 yearsRunning out of ideas now! Try
acpi_backlight=video
instead. -
Hans Anders over 9 yearsAlso isn't working.
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TodorN over 9 yearsTry to open the lid and plug-in/plug-out the power cable. This should turn on the backlight again.
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jmunsch over 9 yearsAs a temporary solution, don't suspend. For a longer term solution, see if you can find an open bug for that laptop model in the debian jessie branch? What model is it? Do you have any hardware information for it? And also consider taking a look at: wiki.archlinux.org/index.php/backlight And if by environment you mean any other window manager ... perhaps roll back the kernel to a previous version that did work?
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Hans Anders over 9 years@TodorN Doing that doesn't work in my case.
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Allexj almost 3 yearsI did this: unix.stackexchange.com/a/561796/314643 make sure to have xScreenSaver
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AdminBee almost 4 yearsWelcome to the site, and thank you for your contribution. Would you ming adding some sort of explanation of why this solves the OPs problem, or how you concluded that this package is the reason for the problem?