@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://bugzilla.kernel.org/show_bug.cgi?id=109051
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? ** Bug watch added: Linux Kernel Bug Tracker #109051 https://bugzilla.kernel.org/show_bug.cgi?id=109051 -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1774950 Title: Suspend fails in Ubuntu and Kubuntu 18.04 but works fine in Ubuntu and Kubuntu 17.10 (and on Kubuntu 18.04 using kernel 4.14.47) Status in linux package in Ubuntu: Confirmed Bug description: I have installed Kubuntu 18.04 on 3 different machines (my friend's and my own) with no suspend problems but my HP Pavilion 11 x360 does not suspend. It suspends fine with Ubuntu 17.10, Kubuntu 17.10, Devuan Jesse, Devuan ASCII and Windows 10 but fails with Ubuntu 18.04 and Kubuntu 18.04. I have also tried suspend using a live USB of 18.04 on this machine and it fails in the same way, so does not appear to be caused by any additional programs that I had installed. By installing an older kernel (4.14) on Kubuntu 18.04 the suspend function works as expected. Running Kubuntu 18.04 with kernels 4.15, 4.16, 4.17 results in the suspend failure that freezes the machine and requires a hard reset. Correct behaviour is - Screen goes blank, fan goes off, power LED flashes to show machine is in suspend. Pressing power button triggers 'resume' function. What happens - Screen goes blank, fan stays on, power LED stays on. Machine stays in this state and does not respond to any keyboard interaction, mouse movement or power button presses. Ctrl + Alt + f1 (or f2, f3, f4 etc) does not get any response. The only way to use the machine is to shut down by holding down the power button. Checking the logs suggests that the machine believes it is in suspend mode sleep [deep] when it isn't. Having to hard reset to get any response means that the kernel logs say no more than sleep [deep] pm-suspend also results in the same problems with kernels 4.15 and 4.16, but works fine with 4.14. It is curious that a machine that suspends fine on an earlier 4.14 kernel no longer works with 4.15 and above, whilst 3 other machines (including one with pretty similar hardware) do not exhibit this problem. There are only a handful of questions about it on the forums but at least 3 other people have the same problem: https://askubuntu.com/questions/1029405/ubuntu-18-04-crashes-on- resuming-from-suspend https://askubuntu.com/questions/1041369/after-upgrading- from-17-10-ubuntu-18-04-wont-sleep-suspend I am attempting to round up anyone else with the same issue and point them to this bug report. My laptop is HP Pavilion x360 11-n013na Matalaks is Acer Aspire ES1-511 collisionTwo has XPS 9560 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1774950/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
