Files
nixos-hardware/gigabyte/b550/b550-fix-suspend.nix
Marien Zwart b416c1d56f Simplify implementation of B550 suspend fix
Instead of using systemd oneshot services that have to be careful to not
toggle wakeups back on, use a udev rule to disable wakeups by device ID.

On a B550 Vision D, these do almost the same thing:

````
$ lspci -n | grep 1022:1483
00:01.1 0604: 1022:1483
00:01.2 0604: 1022:1483
00:03.1 0604: 1022:1483

$ cat /proc/acpi/wakeup
Device  S-state   Status   Sysfs node
...
GPP0      S4    *disabled  pci:0000:00:01.1
GPP8      S4    *disabled  pci:0000:00:03.1
````

Two of the three devices with the PCI vendor/device ID specified by the
udev rule correspond to devices previously disabled via ACPI (if I
understand correctly disabling these via either /proc/acpi/wakeup or
udev device attribute has the same effect).

The third device is (like the other two) using the "pcieport" driver.
Using a device connected via that port as a wakeup device still works.
2025-03-12 15:18:05 +00:00

14 lines
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Nix

{
# Work around an issue causing the system to unsuspend immediately after suspend
# and/or hang after suspend.
#
# See https://www.reddit.com/r/gigabyte/comments/p5ewjn/comment/ksbm0mb/ /u/Demotay
#
# Most suggestions elsewhere are to disable GPP0 and/or GPP8 using /proc/acpi/wakeup, but that is
# inconvenient because it toggles. This does essentially the same thing using udev, which can set
# the wakeup attribute to a specific value.
services.udev.extraRules = ''
ACTION=="add", SUBSYSTEM=="pci", ATTR{vendor}=="0x1022", ATTR{device}=="0x1483", ATTR{power/wakeup}="disabled"
'';
}