Did this issue start happening after an update/upgrade? Was there a prior kernel version where you were not having this particular problem?
Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v4.6 kernel[0]. If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'. If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'. Once testing of the upstream kernel is complete, please mark this bug as "Confirmed". Thanks in advance. [0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.6-rc4-wily/ ** Changed in: linux (Ubuntu) Importance: Undecided => High ** Changed in: linux (Ubuntu) Status: Confirmed => Incomplete -- 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/1571416 Title: System freezes shortly after reaching the desktop (Ubuntu MATE 16.04, PowerPC) Status in linux package in Ubuntu: Incomplete Bug description: The freeze happens every time unless I use "radeon.agpmode=-1" as a kernel parameter. Affected machines: PowerBook G4 5,6 + PowerMac G5 7,3 (w. "ATI Radeon 9600 AP (AGP)". ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: linux-image-4.4.0-18-powerpc-smp 4.4.0-18.34 ProcVersionSignature: Ubuntu 4.4.0-18.34-powerpc-smp 4.4.6 Uname: Linux 4.4.0-18-powerpc-smp ppc ApportVersion: 2.20.1-0ubuntu2 Architecture: powerpc AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: CasperVersion: 1.373 CurrentDesktop: MATE Date: Sun Apr 17 21:08:40 2016 IwConfig: lo no wireless extensions. enP2p36s15f0 no wireless extensions. LiveMediaBuild: Ubuntu-MATE 16.04 LTS "Xenial Xerus" - Release powerpc (20160417.1) PccardctlIdent: Socket 0: no product info available PccardctlStatus: Socket 0: no card ProcEnviron: TERM=xterm PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash ProcFB: 0 radeondrmfb ProcKernelCmdLine: ro ramdisk_size=1048576 file=/cdrom/preseed/username.seed boot=casper quiet --- radeon.agpmode=-1 RelatedPackageVersions: linux-restricted-modules-4.4.0-18-powerpc-smp N/A linux-backports-modules-4.4.0-18-powerpc-smp N/A linux-firmware 1.157 RfKill: 0: hci0: Bluetooth Soft blocked: no Hard blocked: no SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1571416/+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