![]() ![]() Only do a hard reboot if this soft reboot sequence first fails. So, when you press that key your computer will restart. I don't remember where I learned this, but I read it from someone else years ago on Ask Ubuntu or SuperUser somewhere. Note that on some (many?) laptops/keyboards,the PrScr button may require your Function key, Fn, to activate it, so you may have to hold down Ctrl Alt PrScr Fn instead, while typing the REISUB reboot key sequence. Hold down Ctrl Alt PrScr, then press the following keys one-at-a-time while holding those first 3 keys down the whole time: R, E, I, S, U, B. I don't know how to really solve the problem, but remember: before you hold down the power button to hard reboot, you can always soft reboot with this funky sequence: Getting suspend to work on Ubuntu (21.10 - impish release)?.Suspend not working properly (cannot wake up) on Ubuntu 20.04 with NVIDIA.Suspend not working: Ubuntu 20.04 (does not work at all) / 21.10(in battery mode does not work ).Ubuntu 21.10 resume produces blank screen.Initialized Arguments for Method : (1 arguments defined for method invocation)Īrg0: 00000000fe968048 Integer 00000000000000D3ĪCPI Error: Aborting method \_SB.HKEY.DEVT due to previous error (AE_NOT_FOUND) (20210331/psparse-529) No Local Variables are initialized for Method I was also seeing the following ACPI error: ACPI BIOS Error (bug): Could not resolve symbol, AE_NOT_FOUND (20210331/psargs-330) The traces are: WARNING: CPU: 0 PID: 18016 at /var/lib/dkms/nvidia/510.47.03/build/nvidia/nv.c:3935 nv_restore_user_channels 0xce/0xe0 It is easy to know if you've hit the same bug or not, just look for the following stack traces on your dmesg.īecause you are likely shutting down the computer and restarting, you have to look for them in the dmesg of the previous boot as per How to find previous boot log after Ubuntu 16.04 restarts? : journalctl -b-1 Note that even non graphic stuff like NVIDIA's CUDA/OpenCL package was still breaking things, notably I couldn't suspend after removing the graphics but keeping them, related: Ubuntu 18.04.2 immediately wakes up from suspend PURGE EVERYTHING FROM NVIDIA: uninstall all nvidia packages ( dpkg -l | grep -i nvidia, sudo apt uninstall), and purge their configs as well ( sudo apt purge. Apparently this is broken on some setups and kernels. The 470 driver migrated to systemd method while previous versions relied on Kernel Driver Callback. In case you nuke it, the contents of nvidia.bak are: #!/bin/sh Sudo mv /lib/systemd/system-sleep/nvidia ~/nvidia.bak (tested for several days now, seems to be working) the bug report links to from heroic user humblebee which has workaround: sudo systemctl stop rvice Otherwise, the problem would only happen sometimes, and more commonly after suspending for a few hours. To reproduce the problem easily, I had to disconnect the power cable from my laptop and be on battery only. This started happening to me as soon as I moved to Ubuntu 21.10 on my Lenovo ThinkPad P51 NVIDIA Quadro M1200, and based on kernel traces, it is this exact bug: My duplicated investigation: ![]()
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