Screen does not wake up from suspend ("No signal") on a Radeon RX 580

[Pierre Neidhardt]

Hi!

I've deployed Guix on a desktop computer with pretty much the exact same
config as my laptop.

On my laptop I can run

--8<---------------cut here---------------start------------->8---
$ loginctl suspend
--8<---------------cut here---------------end--------------->8---

to hibernate.  Pressing a key will successfully wake it up.

On my desktop, the same command sends the computer to sleep, but while
pressing a key wakes it up (judging from the fans and the hard drive
spinning up) the screen desperately remains off.  Turning it off and on
again displays "No signal".

In short, my desktop uses:

- Linux-libre kernel, instead of a custom kernel for my laptop.
- BIOS Grub because somehow Grub fails in EFI mode...  Whatever.
- A Radeon RX 580 (which works perfectly so far) instead of an Intel for
my laptop.

My config.scm:

- 
https://gitlab.com/ambrevar/dotfiles/raw/master/.guix-packages/ambrevar/system/default.scm
- 
https://gitlab.com/ambrevar/dotfiles/raw/master/.guix-packages/ambrevar/system/desktop-bababa.scm

Any pointer?

--
Pierre Neidhardt
https://ambrevar.xyz/

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