Public bug reported: Starting with kernel version 4.1, the display of may laptop started to flicker like an old-fashioned 50Hz CRT monitor.
My computer is an ASUS Zenbook UX303LA-R0280H (Intel i5-4210, HD 4400, 1366x768) running Kubuntu 15.10. I installed multiple mainline kernels. The problem is not present with 3.19 and 4.0, but occurs with 4.1 and is still present with 4.2, 4.3 and 4.4. (A kernel git-bisect did not work.) ProblemType: Bug DistroRelease: Ubuntu 15.10 Package: linux-image-4.2.0-22-generic 4.2.0-22.27 ProcVersionSignature: Ubuntu 4.2.0-22.27-generic 4.2.6 Uname: Linux 4.2.0-22-generic x86_64 ApportVersion: 2.19.1-0ubuntu5 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: gallmei 2179 F.... pulseaudio /dev/snd/controlC1: gallmei 2179 F.... pulseaudio Date: Tue Jan 5 18:07:40 2016 InstallationDate: Installed on 2015-02-13 (325 days ago) InstallationMedia: Kubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1) Lsusb: Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 001 Device 002: ID 064e:9700 Suyin Corp. Asus Integrated Webcam Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub MachineType: ASUSTeK COMPUTER INC. UX303LA ProcEnviron: TERM=xterm PATH=(custom, no user) LANG=de_DE.UTF-8 SHELL=/bin/bash LC_NUMERIC=C ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-22-generic.efi.signed root=UUID=b3101f2d-7797-4f15-a1ee-eec2c6d92822 ro quiet splash acpi_osi= vt.handoff=7 PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon. RelatedPackageVersions: linux-restricted-modules-4.2.0-22-generic N/A linux-backports-modules-4.2.0-22-generic N/A linux-firmware 1.149.3 SourcePackage: linux UpgradeStatus: Upgraded to wily on 2015-10-31 (65 days ago) dmi.bios.date: 09/01/2014 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: UX303LA.204 dmi.board.asset.tag: ATN12345678901234567 dmi.board.name: UX303LA dmi.board.vendor: ASUSTeK COMPUTER INC. dmi.board.version: 1.0 dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 10 dmi.chassis.vendor: ASUSTeK COMPUTER INC. dmi.chassis.version: 1.0 dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrUX303LA.204:bd09/01/2014:svnASUSTeKCOMPUTERINC.:pnUX303LA:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnUX303LA:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0: dmi.product.name: UX303LA dmi.product.version: 1.0 dmi.sys.vendor: ASUSTeK COMPUTER INC. ** Affects: linux (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug wily -- 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/1531218 Title: Laptop Display flickers like 50Hz CRT monitor Status in linux package in Ubuntu: New Bug description: Starting with kernel version 4.1, the display of may laptop started to flicker like an old-fashioned 50Hz CRT monitor. My computer is an ASUS Zenbook UX303LA-R0280H (Intel i5-4210, HD 4400, 1366x768) running Kubuntu 15.10. I installed multiple mainline kernels. The problem is not present with 3.19 and 4.0, but occurs with 4.1 and is still present with 4.2, 4.3 and 4.4. (A kernel git-bisect did not work.) ProblemType: Bug DistroRelease: Ubuntu 15.10 Package: linux-image-4.2.0-22-generic 4.2.0-22.27 ProcVersionSignature: Ubuntu 4.2.0-22.27-generic 4.2.6 Uname: Linux 4.2.0-22-generic x86_64 ApportVersion: 2.19.1-0ubuntu5 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: gallmei 2179 F.... pulseaudio /dev/snd/controlC1: gallmei 2179 F.... pulseaudio Date: Tue Jan 5 18:07:40 2016 InstallationDate: Installed on 2015-02-13 (325 days ago) InstallationMedia: Kubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1) Lsusb: Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 001 Device 002: ID 064e:9700 Suyin Corp. Asus Integrated Webcam Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub MachineType: ASUSTeK COMPUTER INC. UX303LA ProcEnviron: TERM=xterm PATH=(custom, no user) LANG=de_DE.UTF-8 SHELL=/bin/bash LC_NUMERIC=C ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-22-generic.efi.signed root=UUID=b3101f2d-7797-4f15-a1ee-eec2c6d92822 ro quiet splash acpi_osi= vt.handoff=7 PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon. RelatedPackageVersions: linux-restricted-modules-4.2.0-22-generic N/A linux-backports-modules-4.2.0-22-generic N/A linux-firmware 1.149.3 SourcePackage: linux UpgradeStatus: Upgraded to wily on 2015-10-31 (65 days ago) dmi.bios.date: 09/01/2014 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: UX303LA.204 dmi.board.asset.tag: ATN12345678901234567 dmi.board.name: UX303LA dmi.board.vendor: ASUSTeK COMPUTER INC. dmi.board.version: 1.0 dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 10 dmi.chassis.vendor: ASUSTeK COMPUTER INC. dmi.chassis.version: 1.0 dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrUX303LA.204:bd09/01/2014:svnASUSTeKCOMPUTERINC.:pnUX303LA:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnUX303LA:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0: dmi.product.name: UX303LA dmi.product.version: 1.0 dmi.sys.vendor: ASUSTeK COMPUTER INC. 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