So I have a bit of a strange issue ... when I put my laptop in a suspend state using the top-right menu in GNOME, it automatically turns on again after one second of sleep.
I unplugged all devices connected to my laptop one by one and found that my 4k Philips monitor is to blame. Without it, sleep works perfectly. When connected, the same faulty pattern appears again.
This is the output of /proc/acpi/wakeup:
Device S-state Status Sysfs node
GPP1 S4 *disabled
GPP2 S4 *disabled
GPP0 S4 *disabled pci:0000:00:01.1
GPP5 S4 *enabled pci:0000:00:02.1
GPP6 S4 *enabled pci:0000:00:02.2
GPP7 S4 *disabled
GP11 S0 *disabled pci:0000:00:03.1
SWUS S4 *disabled
GP12 S0 *disabled
SWUS S4 *disabled
XHC0 S4 *enabled pci:0000:35:00.3
XHC1 S4 *enabled pci:0000:35:00.4
XHC2 S4 *enabled pci:0000:36:00.0
XHC3 S4 *enabled pci:0000:36:00.3
XHC4 S4 *enabled pci:0000:36:00.4
NHI0 S0 *enabled pci:0000:36:00.5
NHI1 S0 *disabled
I went through the ones that are enabled but could not find any device of interest. Only a PCIe GPP Bridge and some USB Controllers.
Is there anything I can do to fix this problem? In theory, I have no problem preventing all peripherals from waking up the PC, because I always have access to the power button. However, if there is a way to disable the wakeup capability only for the HDMI device in /sys/devices I'm all ears.
Somewhat related:
