Found another post with the same monitor power-down cycling problem viewtopic.php?t=365369. Per their suggestion, updated to the latest stable firmware and that resolved the issue. Unfortunately, my monitor still requires "vc4.force_hotplug" to avoid immediate wakeup from sleep. Given the video driver initiates monitor sleep, seems like the driver could ignoring hotplug pulses for couple seconds and side-step the issue in a less impactful way.
With power savings working, now bypassing setterm and enable 1-minute blanking via:
% sudo sh -c "echo -e '\033[9;1]' >/dev/console"
Then disable fbdev emulation:
% sudo sh -c "echo N >/sys/module/drm_kms_helper/parameters/fbdev_emulation"
Am happy with the results so calling this solved.
With power savings working, now bypassing setterm and enable 1-minute blanking via:
% sudo sh -c "echo -e '\033[9;1]' >/dev/console"
Then disable fbdev emulation:
% sudo sh -c "echo N >/sys/module/drm_kms_helper/parameters/fbdev_emulation"
Am happy with the results so calling this solved.
Statistics: Posted by Vraz — Thu Mar 20, 2025 3:01 pm