Public bug reported: I am using Ubuntu 16.04 with KDE Neon User Edition on a Lenovo T510. The screen blinks periodically. I describe it as a blink because it seems to switch off and right back on very quickly, as if I had just blinked by eyes. At seemingly random times, the screen will go black except for a tiny sliver of orange or yellow along the left edge, then the machine loses power.
I have searched the logs and it seems that all logging just stops before the power outage without actually logging anything useful. This problem began shortly after I migrated from Kubuntu 14.04, so I installed a 3.13.0 kernel from the Ubuntu 14.04 repository and the problem went away. I then tried a 4.1.38 kernel from http://kernel.ubuntu.com/~kernel-ppa/mainline. The 4.1 kernel is also problem free and the most recent kernel I can run without the power outages. However, all of these kernels have the power outage issue: Name Version Source ------------------------------------ ---------------------------- ----------------- linux-image-generic 4.4.0.78.84 16.04 repository linux-image-generic-hwe-16.04 4.8.0.52.23 16.04 repository linux-image-generic-hwe-16.04-edge 4.10.0.21.14 16.04 repository linux-image-4.11.0-041100rc8-generic 4.11.0-041100rc8.201704232131 kernel.ubuntu.com These kernels are fine: Name Version Source ------------------------------------ ---------------------------- ----------------- linux-image-3.13.0-24-generic 3.13.0-24.47 14.04 repository linux-image-4.1.38-040138-generic 4.1.38-040138.201701181632 kernel.ubuntu.com So, it seems the problem originated sometime between versions 4.1.38 and 4.4.0. Here is my lshw information: H/W path Device Class Description ======================================================= system 4313CTO /0 bus 4313CTO /0/0 memory 128KiB BIOS /0/6 processor Intel(R) Core(TM) i7 CPU M 620 @ 2.67GHz /0/6/a memory 32KiB L1 cache /0/6/b memory 256KiB L2 cache /0/6/c memory 4MiB L3 cache /0/2a memory 8GiB System Memory /0/2a/0 memory 4GiB SODIMM DDR3 Synchronous 1334 MHz (0.7 ns) /0/2a/1 memory 4GiB SODIMM DDR3 Synchronous 1334 MHz (0.7 ns) /0/100 bridge Core Processor DRAM Controller /0/100/2 display Core Processor Integrated Graphics Controller /0/100/16 communication 5 Series/3400 Series Chipset HECI Controller /0/100/19 enp0s25 network 82577LM Gigabit Network Connection /0/100/1a bus 5 Series/3400 Series Chipset USB2 Enhanced Host Controller /0/100/1a/1 usb1 bus EHCI Host Controller /0/100/1a/1/1 bus Integrated Rate Matching Hub /0/100/1a/1/1/4 communication Broadcom Bluetooth Device /0/100/1b multimedia 5 Series/3400 Series Chipset High Definition Audio /0/100/1c bridge 5 Series/3400 Series Chipset PCI Express Root Port 1 /0/100/1c.1 bridge 5 Series/3400 Series Chipset PCI Express Root Port 2 /0/100/1c.1/0 wlp3s0 network Centrino Ultimate-N 6300 /0/100/1c.3 bridge 5 Series/3400 Series Chipset PCI Express Root Port 4 /0/100/1c.4 bridge 5 Series/3400 Series Chipset PCI Express Root Port 5 /0/100/1c.4/0 generic MMC/SD Host Controller /0/100/1c.4/0.1 generic R5U2xx (R5U230 / R5U231 / R5U241) [Memory Stick Host Controller] /0/100/1c.4/0.3 bus R5C832 PCIe IEEE 1394 Controller /0/100/1d bus 5 Series/3400 Series Chipset USB2 Enhanced Host Controller /0/100/1d/1 usb2 bus EHCI Host Controller /0/100/1d/1/1 bus Integrated Rate Matching Hub /0/100/1e bridge 82801 Mobile PCI Bridge /0/100/1f bridge QM57 Chipset LPC Interface Controller /0/100/1f.2 storage 5 Series/3400 Series Chipset 6 port SATA AHCI Controller /0/100/1f.3 bus 5 Series/3400 Series Chipset SMBus Controller /0/100/1f.6 generic 5 Series/3400 Series Chipset Thermal Subsystem /0/101 bridge Core Processor QuickPath Architecture Generic Non-core Registers /0/102 bridge Core Processor QuickPath Architecture System Address Decoder /0/103 bridge Core Processor QPI Link 0 /0/104 bridge 1st Generation Core i3/5/7 Processor QPI Physical 0 /0/105 bridge 1st Generation Core i3/5/7 Processor Reserved /0/106 bridge 1st Generation Core i3/5/7 Processor Reserved /0/1 scsi0 storage /0/1/0.0.0 /dev/sda disk 500GB HITACHI HTS72505 /0/1/0.0.0/1 /dev/sda1 volume 1906MiB EXT4 volume /0/1/0.0.0/2 /dev/sda2 volume 463GiB Linux filesystem partition /0/2 scsi1 storage /0/2/0.0.0 /dev/cdrom disk DVDRAM GT33N /1 power 42T4801 ** Affects: ubuntu Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1693544 Title: power loss with kernels newer than 4.1 in Ubuntu 16.04 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/1693544/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
