I have duplicated the behavior in VirtualBox 4.3.22 using the 64-bit 15.04 beta 1 livecd, but only when all CPU cores are completely busy (e.g. setting 1 core for the VM and running "dd < /dev/zero > /dev/null").
** Description changed: If the Num lock key is toggled rapidly, there's a chance that mate-settings-daemon will go into runaway CPU usage (causing Xorg to also appear to be in runaway CPU usage), and the Num lock LED will flash/blink erratically (randomly--this is not the steady 2Hz blinking when a kernel panic occurs). By killing mate-settings-daemon, the system can recover; mate-settings-daemon respawns, Xorg goes back to normal CPU usage, and the Num lock LED is stable. - This behavior is present on an up-to-date installation of Ubuntu MATE 14.10 (beta 1)as well as the LiveCD. This seems to apply only to hardware Num lock toggling, as rapid toggling in onboard does not seem to cause the issue. The same does not appear to happen to the caps lock key. The state of num lock is indeed indeterminate when this occurs (e.g. numeric 4 will vary between typing '4' and left-arrow). This appears to be directly related to prior CPU availability, as it is more of a problem on older hardware (e.g. with 2001 Pentium M) where it can be triggered on an idle system, and more difficult to duplicate on later hardware (e.g. with a dual-core processor) unless the CPUs are busy (e.g. other runaway processes). - Only tested on 32-bit; will upload apport info. - --- + Tested on both 32-bit and 64-bit. This behavior is present at least since Ubuntu MATE 14.10 (beta 1). + --- ApportVersion: 2.14.7-0ubuntu1 Architecture: i386 DistroRelease: Ubuntu 14.10 InstallationDate: Installed on 2014-08-31 (1 days ago) InstallationMedia: Ubuntu MATE 14.10 "Utopic Unicorn" - beta1 i386 (20140828) Package: mate-settings-daemon 1.8.1-2 PackageArchitecture: all ProcVersionSignature: Ubuntu 3.16.0-11.16-generic 3.16.1 Tags: utopic Uname: Linux 3.16.0-11-generic i686 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo _MarkForUpload: True -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1364111 Title: Num lock toggling causing mate-settings-daemon, xorg cpu runaway, LED astable To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-mate/+bug/1364111/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
