<html><head></head><body><div class="ydpd32d657eyahoo-style-wrap" style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:16px;"><div id="ydpd32d657eyiv3042043088"><div style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:16px;" class="ydpd32d657eyiv3042043088yahoo-style-wrap">Thanks Alan and Vladimir!<div>These are very effective clues to help me understand the whole architecture, but I will need some experiments! :D</div><div><br></div><div>I may continue with this thread later to ask questions about the main problem discussed here (i.e., turning off the screen), if I find my approach feasible! I think that the kernel structure storing the display state is `struct drm_crtc_state`, particularly, its `enabled` and `active` fields.</div><div><br></div><div>There exists a `linux_pm` mailing list which seems to be related to my question. But it seems to be for development purposes, and not for learning! Where do you think I can ask the gpu/power-management related questions at the kernel level?</div><div><br></div><div>Regards.</div></div></div></div></body></html>