dual monitors wake intermittently during power saving inactivity

mj-crabtree commented 2 years ago

Distribution

NAME="Pop!_OS"
VERSION="21.04"
ID=pop
ID_LIKE="ubuntu debian"
PRETTY_NAME="Pop!_OS 21.04"
VERSION_ID="21.04"
HOME_URL="https://pop.system76.com"
SUPPORT_URL="https://support.system76.com"
BUG_REPORT_URL="https://github.com/pop-os/pop/issues"
PRIVACY_POLICY_URL="https://system76.com/privacy"
VERSION_CODENAME=hirsute
UBUNTU_CODENAME=hirsute
LOGO=distributor-logo-pop-os

Linux hearth 5.15.5-76051505-generic #202111250933~1638201579~21.04~09f1aa7-Ubuntu SMP Tue Nov 30 02: x86_64 x86_64 x86_64 GNU/Linux

Issue/Bug Description

2x external DP monitors wake from sleep shortly after monitor power saving mode is enabled,
an inconsistent amount of time passes, though usually between 45-60 seconds
both monitors wake from sleep, enter "scanning for signal" mode at the same time,
no signal is found, monitors both go back into power saving mode at the same time
repeat 2-5

Steps to reproduce

configure displays to power off after one minute
wait

Expected behavior

monitors should stay off until someone interacts physically with the computer

Other notes

See also this issue
This is about three minutes' worth of journalctl output. I executed journalctl -f > out.txt and waited for the issue to occur. I hope this is helpful!
Radeon RX 590 GPU
Power settings below

leviport commented 2 years ago

Can you also include the make and model of your displays? We have a display in the lab that will do this somewhat regularly, but it was something that would happen across a wide variety of machines and it seems pretty OS-agnostic.

mj-crabtree commented 2 years ago

Interesting! I have a pair of Dell P2720D monitors.

mj-crabtree commented 2 years ago

Update: the issue is still present on the latest revision of Pop!

pop-os / pop

dual monitors wake intermittently during power saving inactivity #2050