Screen is dark after wakeup from suspend

[2whlrider]

What Happened?

6.1 Jolnir Power Button settings are 15min/Suspend/15min. My desktop successfully suspends and successfully wakes up on key press but my monitor remains dark. If I shut off my monitor and restart I get the elementary login screen. The monitor is apparently not getting the wakeup signal it needs to resume after suspend.

Steps to Reproduce

Power Settings: Turn off display when active: 15 minutes (same non-wake-up behavior if set to "never") Power Button: Suspend Suspend when inactive for: 15 minutes

Expected Behavior

I expect the monitor to wake-up when the OS resumes from suspension.

OS Version

6.x (Odin)

Software Version

Latest release (I have run all updates)

Log Output

No response

Hardware Info

Asrock B450 Pro 4 motherboard AMD Ryzen 2600 Powercolor Radian RX 580 Lenovo Thinkvision 24" Monitor

[justinmichaelvieira]

I am also experiencing this issue, on elementary OS 6.1 Jólnir

Hardware info: Huawei Matebook Pro (2020) Quad-Core Intel® Core™ i7-8550U CPU @ 1.80GHz Intel® UHD Graphics 620 (Kabylake GT2) NVIDIA Corporation GP108M [GeForce MX150] 16GB memory

When the laptop wakes from Suspend, screen brightness is consistently at the lowest possible setting. Regardless of what screen brightness was set to, before the laptop was suspended.

[baloghszilveszter]

This solved the black screen problem for me:

I added this line to /etc/default/grub

GRUB_CMDLINE_LINUX="intel_idle.max_cstate=1 i915.enable_dc=0"

then

sudo update-grub && sudo reboot

Hardware info:

Dell Latitude 5590 CPU: Intel i7-8650U (8) @ 4.200GHz GPU: Intel UHD Graphics 620 Memory: 16GB