On Mon, Jul 18, 2016 at 2:48 PM, Joseph Salisbury < joseph.salisb...@canonical.com> wrote:
> Does booting back into the Trusty kernel on the Xenial installed system > make the bug go away? > Yes. I've done multiple reboot experiments now and have learned the bug only happens about 80% of the time, so I did all of these will multiple reboots each: 3.16.0-77 GOOD 3.19.0-65 GOOD 4.2.0-42 BAD 4.4.0-31 BAD All generic versions, 4.4 was using the .efi.signed variant. I've attached the dmesg for 3.19-65 BTW, none of the kernels manage a seamless graphical boot like Windows does. All successes sit at black screens for a long time then transition to the splash for maybe 0.5s then into the graphical login (after another black screen flash). Come to think of it, I don't think I've ever seen Ubuntu do this properly on any release on any hardware I've tried (at least with EFI boot). Even my HP's at work sit at a black screen for more time than the splash. So I don't understand why Canonical bothers with the vt_handoff stuff, when it seems *worse* on than off. At least without vt_handoff you get something that looks like a running computer instead of black screen.. That said, I think it works better with BIOS boot ?? Windows 7 & 10 both do this perfectly in EFI mode, the monitor is never black. Jason -- 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/1603810 Title: Ubuntu turns monitor permanently off during boot Status in linux package in Ubuntu: Confirmed Bug description: This is a regression, at least trusty (and prior) worked fine on this hardware. Booting the Xenial installer image off USB also worked fine. The system boots fine, however the monitor is in DPMS power-off and does not ever turn back on. Switching VTs doesn't help, I have found no way to get it switch on. Removing '$vt_handoff' from grub resolves the problem and the system seems to work fine. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: linux-image-4.4.0-31-generic 4.4.0-31.50 ProcVersionSignature: Ubuntu 4.4.0-31.50-generic 4.4.13 Uname: Linux 4.4.0-31-generic x86_64 ApportVersion: 2.20.1-0ubuntu2.1 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: jgg 2224 F.... pulseaudio /dev/snd/controlC0: jgg 2224 F.... pulseaudio CurrentDesktop: Unity Date: Sun Jul 17 14:04:30 2016 HibernationDevice: RESUME=UUID=b254872c-e84b-427c-bebe-343c031cbdcd InstallationDate: Installed on 2016-04-22 (86 days ago) InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1) IwConfig: lo no wireless extensions. enp6s0 no wireless extensions. MachineType: System manufacturer System Product Name ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-31-generic.efi.signed root=/dev/mapper/main2-xenial64 ro quiet splash RelatedPackageVersions: linux-restricted-modules-4.4.0-31-generic N/A linux-backports-modules-4.4.0-31-generic N/A linux-firmware 1.157.2 RfKill: SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 11/25/2010 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 0805 dmi.board.asset.tag: To be filled by O.E.M. dmi.board.name: P8H67-M EVO dmi.board.vendor: ASUSTeK Computer INC. dmi.board.version: Rev 1.xx dmi.chassis.asset.tag: Asset-1234567890 dmi.chassis.type: 3 dmi.chassis.vendor: Chassis Manufacture dmi.chassis.version: Chassis Version dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0805:bd11/25/2010:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP8H67-MEVO:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion: dmi.product.name: System Product Name dmi.product.version: System Version dmi.sys.vendor: System manufacturer To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1603810/+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
