When i wake up my computer, my screen goes from standby mode to powered mode, and then immediately goes back to standby mode. I have to press some key or move the mice for the screen to power up for real (so that i can see the locked login screen). This happens if both "Settings/Power Manager/Security/Lock screen when system is going for sleep" and "Settings/Session and Startup/Advanced/Lock screen before sleep" are both checked. I see those settings are somewhat synchronysed, but if i uncheck the xfce4-session one *without* going to the power manager settings panel, the problem disapears (the screen goes into stanby mode on suspend, and powers on as expected on resume, showing the locked greeter). If i then go to the power manager settings panel, i see the option is also unchecked (has been synchronized at display time it seems). but then the screen is not locked anymore on suspend. This is on ubuntu 17.04 with xfce4-session-4.12.1-3ubuntu3 and xfce4-power-manager-1.4.4-4ubuntu2. I can reproduce this behavior and the workaround on 3 desktop systems.
I'm not able to reproduce the bug, however I'm on laptop under Debian 9. I'll try to install xubuntu 17.04 on a spare laptop I have to test it. In the meantime, how are you suspending/hibernating your system? Using the session logout dialog, right?
I usually suspend by pressing the hardware power button, but i just checked that using the session logout dialog produce the same effects. FYI, I upgraded to xubuntu 17.10 (same X-PM package version, same behavior).
-- GitLab Migration Automatic Message -- This bug has been migrated to xfce.org's GitLab instance and has been closed from further activity. You can subscribe and participate further through the new bug through this link to our GitLab instance: https://gitlab.xfce.org/xfce/xfce4-power-manager/-/issues/28. Please create an account or use an existing account on one of our supported OAuth providers. If you want to fork to submit patches and merge requests please continue reading here: https://docs.xfce.org/contribute/dev/git/start#gitlab_forks_and_merge_requests Also feel free to reach out to us on the mailing list https://mail.xfce.org/mailman/listinfo/xfce4-dev