Comment 0 for bug 1687353

Hello

I have a Lenovo Ideapad 310. I was having issues with power management, and was using upstream kernels. I noticed they had frequent freezes, so I decided to use the standard from Ubuntu 16.04 (today, 4.4.0-75). But now it has this freezes too, so something which was bugged on the newer kernel was inserted on 4.4.0-75, as previous version (4.4.0-72) hadn't this issue.

What is happening is: the system freezes. The sound that was being played loops endlessly. Everything freezes, Ctrl+Alt+Fnumber don't work. The system completely stops. Normally, I would just power the computer off keeping the power button pressed. But this time I tried to recover it, as the syslog ended always corrupted. I needed to gets the logs at least once. So I started to disconnect hardware parts: battery charger, external USB HDD (it was not being accessed), USB mouse, USB keyboard. When I disconnected the sound jack, I noticed the mouse moved, so it was recoverable.

I waited for 100 seconds until the system recovered. When it recovered, looked like nothing had happened, and now I'm writing this report from the computer, without restarting.

Steps to reproduce:
1) open Audacious or VLC;
2) play a music/video on Audacious or VLC;
3) open another program with sound (Steam, a browser (I use Opera), etc);
4) use the computer until a freeze happens.

Observations:

-Audacious + Steam + Starbound is nearly 100% chance of triggering it (SDL?).
-VLC + Opera + Firefox (on start page) was enough for trigger it once, even with the only program with media opened being VLC.

The freeze I was able to recover had: Opera Developer (YouTube video playing) + Audacious (playing) + Steam with audio streams opened on pavucontrol. Additionally, Thunderbird and Evince were opened, and intel-gpu-overlay was opened inside a Xnest window.

The syslog says to report to alsa, so I'm writing the report here. However, it should be noted that there is a i915 error too, maybe it was a consequence, maybe it was the cause.

$ lsb_release -rd
Description: Ubuntu 16.04.2 LTS
Release: 16.04

$ uname -a
Linux usuario-Lenovo-ideapad-310-14ISK 4.4.0-75-generic #96-Ubuntu SMP Thu Apr 20 09:56:33 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

Thank you.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: libasound2 1.1.0-0ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-75.96-generic 4.4.59
Uname: Linux 4.4.0-75-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.5
Architecture: amd64
CurrentDesktop: XFCE
Date: Sun Apr 30 23:43:29 2017
Dependencies:
 gcc-6-base 6.0.1-0ubuntu1
 libasound2-data 1.1.0-0ubuntu1
 libc6 2.23-0ubuntu7
 libgcc1 1:6.0.1-0ubuntu1
InstallationDate: Installed on 2016-12-31 (121 days ago)
InstallationMedia: Xubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
SourcePackage: alsa-lib
UpgradeStatus: No upgrade log present (probably fresh install)