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bbfa235
(Get the code!)
@perryhelionsemail - I am really hesitant to removing the max_cstate boot flag: I had to set this in order to avoid random and total system freezes. And that bug seems to be anything but fixed: https:/
So, with due respect to curiosity – not gonna try that. ;)
However, it seems I found a solution for now for my flickering graphics issues.
I tried Gnome Shell (Ubuntu's default DE). There I did NOT encounter any flickering.
But Gnome Shell isn't a Desktop Environment I would want to settle on – I'll save you my random rant about it. :) And that was not my solution.
In trying to find a fix for my previously mentioned Cinnamon login-crash bug, I had upgraded Cinnamon to the latest stable version 3.8.3 via a PPA (the current version in Ubuntu's repo is 3.6.7). Today, I purged the PPA and downgraded Cinnamon to the older Ubuntu's repo version. As a result, the flickering issues with the patched kernel seem to be gone, so I'm mostly good for now, as far as I can see. :)
To summarize:
- The patched 4.15.0-24 kernel enables me to suspend-to-ram.
- The patched 4.15.0-24 kernel brings a new issue for me: A minute-long wait before I get to the Ubuntu greeter and am able to login to a DE. This does not happen in 4.15.0-23.
- The patched 4.15.0-24 in combination with latest Cinnamon 3.8.3 (via PPA) causes graphics flickering big time. This does not occur in 4.15.0-23, either.
So, while indeed restoring suspend, the patch still seems to be missing something.
@kaihengfeng - Is there any way I might help debugging or provide additional info?