Kubuntu Freezes / Crashes on Suspend to RAM

[Kai Petzke]

Hardware is Lenovo Yoga 2 13.3 convertible. Unfortunately, I have two problems with suspend-to-RAM on Kubuntu 15.10.

* Problem one is already reported in bug report 1418295: Sometimes, the screen freezes on resume. This seems to happen more often, when I happen to touch the touchscreen in the seconds of resume. As this is already a confirmed bug, no more info to it here.

* Problem two - and the more serious problem - is, that the whole system freezes at the time of suspend-to-RAM, when it has been running for more than two hours since boot or last resume. So, if I remember to interrupt my work at least every two hours, press the power button (which I have set to perform suspend-to-RAM), and then immediately wake up the system again, I am fine. But if the system has run for more than two hours, and I then do the suspend-to-RAM, it freezes before the suspend: The screen turns black as it ought to in suspend-to-RAM, but the power does not go off and the CPU fan keeps running. Input is no longer possible. In this state, the only thing, that I can do, is a hard power-off: Press the power-button for over 5 seconds.

This problem is very annoying.

I've had this problem since original install with Kubuntu 15.04. An install to Kubuntu 15.10 in the last weeks didn't solve it.

I tried to report this bug also with ubuntu-bug, but it ended with a segfault, after it displayed the aggregated data.

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: xorg 1:7.7+7ubuntu4
ProcVersionSignature: Ubuntu 4.2.0-18.22-generic 4.2.3
Uname: Linux 4.2.0-18-generic x86_64
ApportVersion: 2.19.1-0ubuntu4
Architecture: amd64
CurrentDesktop: KDE
Date: Thu Nov 19 16:04:34 2015
InstallationDate: Installed on 2015-07-06 (135 days ago)
InstallationMedia: Kubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
SourcePackage: xorg
Symptom: display
UpgradeStatus: Upgraded to wily on 2015-10-18 (31 days ago)

[penalvch (penalvch)]

Kai Petzke, thank you for reporting this and helping make Ubuntu better.

Could you please run the following command once from a terminal as it will automatically gather and attach updated debug information to this report:
apport-collect -p xorg 1517950

Please ensure you have the package xdiagnose installed, and that you click the Yes button for attaching additional debugging information.

When reporting xorg related bugs in the future, please do so via the above method. You can learn more about this functionality at https://wiki.ubuntu.com/ReportingBugs.

[Launchpad Janitor (janitor)]

[Expired for xorg (Ubuntu) because there has been no activity for 60 days.]