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I am very new to linux. On my laptop I have a multiboot with Windows 10 and Ubuntu 20.04 on the same disk.

The problem is when I suspend to RAM and then wake it up by pressing the power button, the disk starts running, however the screen remains black. I tried logging in blind (the screen was still black and I tried using the keyboard), opening terminal and typing reboot and that works.

Looking for solution, I found this thread. One of the solutions were to sudoedit /etc/default/grub and add nouveau.modeset=0 to the line that says GRUB_CMDLINE_LINUX. Apparently it's an nvidia driver bug. Except I have AMD CPU with Radeon graphics, so this isn't my case, right?

Another solution was installing xscreensaver, which I already had installed. I also checked the possibility of having the swap partition encrypted which also wasn't the case.

Is it some problem with AMD drivers? Can you please help me find a solution?

My hardware is HP Probook 455 G7 with AMD Ryzen 3 4300U, AMD Radeon Graphics and 16 GB RAM. I am running 64bit Ubuntu 20.04.1 LTS, GNOME 3.36.3 and kernel 5.4.0-47

nice-guy
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    Wake is always difficult in linux... You should seach in Google if something wrote some about your computer with some suspend, wake,... and your comuter name keywords. – Oli Sep 14 '20 at 18:49
  • All these answers about Nvidia when OP clearly states they're using AMD. – DevOpsSauce Sep 01 '22 at 12:58

6 Answers6

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Seems like an amdgpu issue, which is resolved in kernel 5.8. As the current kernel is 5.4, you should do:

sudo apt install linux-generic-hwe-20.04-edge

I found the answer here: Is there a kernel 5.8 ppa for ubuntu 20.04?

Epo Nym
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I stumbled across this post and have an Nvidia card. The sudo ubuntu-drivers autoinstall fixed the issue for me.

So for anyone with Nvidia cards, it seems that clicking on 'additional drivers' doesn't have what an autoinstall does.

Update: Yes the above fixed if one has Nivida and same blank screen after suspend, yet found issue remain if logged in, and suspend resumed as normal if I logged out first then suspend. Then resume normal. Strange.

For debugging I use to have separate home partition and swap partition and all this now since found do not need seaparate partitions. Anyway found another post suggested:

... sudo apt install gnome-screensaver ...

Now No more blank screen after suspend resume. So an easy fix:

... sudo ubuntu-drivers autoinstall && apt install gnome-screensaver ...

p.s. I think it is to do with 'no-more' separate swap and root partitions, and current Nvidia video drivers. not technical so just saying. Thank you all at ask Ubuntu, posting this for others. Happy puppy :-)

The silverswordtongue
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    As [noted yesterday](https://askubuntu.com/questions/1275093/black-screen-after-waking-from-suspend-on-ubuntu-20-04/1355647#comment2319817_1354056), `ubuntu-drivers autoinstall` is for proprietary drivers, such as Nvidia's. However the OP has AMD graphics, which require open source drivers. – Greenonline Aug 03 '21 at 07:08
  • seems the title of this question is causing people with other graphics hardware to land on this question. Answers like this can be here to help them I guess – Zanna Aug 03 '21 at 12:00
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On my Legion 5 pro with NVIDIA GeForce RTX 3050Ti this solution works for me (It fixes both issues: change brightness and wake up after suspend)

  1. Select discrete card in BIOS setup
  2. Install drivers
ubuntu-drivers autoinstall
  1. Open Software & Updates application on tab Additional drivers select nvidia-driver-470, it does not works with nvidia-driver-510

Restart system

  1. Go to /sys/class/backlight and get available brightness acpi
> ls /sys/class/backlight
nvidia_0    # <- if you have here nvidia_0 then it's ok
  1. Create backlight rule
sudo nano /etc/udev/rules.d/backlight.rules

add this content

ACTION=="add", SUBSYSTEM=="backlight", KERNEL=="nvidia_0", GROUP="video", MODE="0664"
RUN+="/bin/chgrp video /sys/class/backlight/nvidia_0/brightness"
RUN+="/bin/chmod g+w /sys/class/backlight/nvidia_0/brightness"

Save file

  1. Update grub
sudo nano /etc/default/grub

update line with GRUB_CMDLINE_LINUX_DEFAULT

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=nvidia_0 nvidia.NVreg_RegistryDwords=EnableBrightnessControl=1"

save file

sudo update-grub

Restart system

Andrey Izman
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    Amazing. Tried every possible combination from other answers and nothing helped. It works in Ubuntu 21.10, Lenovo Legion 7 RTX 3070 – Sebastián Palma May 15 '22 at 16:42
  • Finally this worked. `nvidia-driver-470` proved to be the key. For brightness I found that the backlight rule could be skipped. – Jurrian Oct 06 '22 at 16:06
  • What if the directory `/sys/class/backlight` is empty after switching to the `nvidia-driver-470`? – martin36 May 22 '23 at 17:13
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The problem can come from GPU drivers. Try this one, then restart your laptop:

sudo ubuntu-drivers autoinstall
Walllter
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    Not applicable. `ubuntu-drivers autoinstall` is only for **proprietary** drivers. AMD graphics drivers are open/source. – ChanganAuto Aug 01 '21 at 11:21
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    Not applicable to this question yes, but it did solve this same issue I had in my box with an NVIDIA card. Thanks @Walllter . – petobens Mar 15 '22 at 20:10
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I've noticed that I have issues coming back from suspend if the video driver and line 11 of /etc/default/grub do not correlate to the following:

if using the NVIDIA proprietary driver go into /etc/default/grub and change line 11 to GRUB_CMDLINE_LINUX=""

if using the X.org driver go into /etc/default/grub and change line 11 to GRUB_CMDLINE_LINUX="nouveau.modeset=0"

After making the change depending on which driver I'm using it has resolved the issue.

user1529321
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if using the NVIDIA proprietary driver go into /etc/default/grub and change line 11 to GRUB_CMDLINE_LINUX=""

if using the X.org driver go into /etc/default/grub and change line 11 to GRUB_CMDLINE_LINUX="nouveau.modeset=0"

and... You need to check the settings of the NVIDIA driver!!! Mine was on balanced and nothing helped until I changed to the FullPower-NVIDIA or the Powersaving Xorg driver...

Zaphod Saci
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    Welcome to Ask Ubuntu! Thanks for posting an answer. Your answer could be improved with additional supporting information. Please [edit] to add further details, such as citations or documentation, so that others can confirm that your answer is correct. You can find more information on how to write good answers [in the help center](/help/how-to-answer). Also, see https://askubuntu.com/help/formatting – Error404 Jan 22 '22 at 11:08