I got a tip from Navin at https://bugzilla.kernel.org/show_bug.cgi?id=118401 to try acpi=noirq and this does not only let me boot kernels>=4.3 (I'm writing this from mainline 4.7!), but also makes it poweroff and restart correctly.
However, it does not resume from suspend (it seems to suspend as it should, but clicking the power button to turn it back on does nothing). ** Bug watch added: Linux Kernel Bug Tracker #118401 http://bugzilla.kernel.org/show_bug.cgi?id=118401 -- 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/1463422 Title: [Lenovo IdeaCentre A740] Doesn't poweroff on shutdown Status in linux package in Ubuntu: Triaged Bug description: With my Haswell based Lenovo IdeaCentre A740, if I do "systemctl poweroff" or use any GUI to try to shut down, it gets to the stage of: [ OK ] Reached target Shutdown reboot: System halted but just sits there unresponsive, and does not actually power down. Similarly, if I try running "fwts -P", the hibernate test seems like it crashes the computer (screen is on but unresponsive), then if I click the power button twice, it resumes from hibernation just fine. If I try to reboot, it's almost the same, except the display shows weird psychedelic lines and colours, but everything is unresponsive and I have to click (and this time *hold* not just simple click) the power button. I can reboot fine from GRUB with ctrl+alt+delete. I've kept the Windows partition that came with the computer, that also powers down and reboots fine. If I click the power button while Ubuntu is started, it powers off immediately. I originally asked a question at https://askubuntu.com/questions/632591/system-does-not-power-off-on- poweroff-just-halts but I don't think it has an answer since this seems more likely to be a kernel bug. ProblemType: Bug DistroRelease: Ubuntu 15.04 Package: linux-image-3.19.0-18-generic 3.19.0-18.18 ProcVersionSignature: Ubuntu 3.19.0-18.18-generic 3.19.6 Uname: Linux 3.19.0-18-generic x86_64 ApportVersion: 2.17.2-0ubuntu1.1 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: kiwibird 1481 F.... pulseaudio CurrentDesktop: XFCE Date: Tue Jun 9 15:41:05 2015 HibernationDevice: RESUME=UUID=dc4226ca-3ebe-4611-95ac-c1a0ccbb7d7a InstallationDate: Installed on 2015-06-04 (5 days ago) InstallationMedia: Xubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422.1) MachineType: LENOVO F0AM ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-18-generic.efi.signed root=UUID=91533e8a-b5ca-4447-8c4a-b5bb2d095238 ro noprompt persistent RelatedPackageVersions: linux-restricted-modules-3.19.0-18-generic N/A linux-backports-modules-3.19.0-18-generic N/A linux-firmware 1.143.1 RfKill: 0: phy0: Wireless LAN Soft blocked: no Hard blocked: no SourcePackage: linux StagingDrivers: r8723au UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev' UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 09/30/2014 dmi.bios.vendor: LENOVO dmi.bios.version: O00KT19AUS dmi.board.name: INVALID dmi.board.vendor: LENOVO dmi.board.version: 31900058 STD dmi.chassis.type: 13 dmi.chassis.vendor: LENOVO dmi.chassis.version: Chassis Version dmi.modalias: dmi:bvnLENOVO:bvrO00KT19AUS:bd09/30/2014:svnLENOVO:pnF0AM:pvrLenovoA740:rvnLENOVO:rnINVALID:rvr31900058STD:cvnLENOVO:ct13:cvrChassisVersion: dmi.product.name: F0AM dmi.product.version: Lenovo A740 dmi.sys.vendor: LENOVO To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1463422/+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
