Affects me as well. Reproduced on: * Dell XPS 7390, i7-10510U, integrated graphics, laptop screen * Focal with latest updates * Kernels: * 5.8.0-55-generic (linux-image-generic-hwe-20.04) * 5.13.0-rc4 (vanilla from mainline-ppa)
In the kernel log, "fb0: switching to inteldrmfb from EFI VGA" is the last line I see before the mode change, and "clocksource: tsc: mask: 0xffffffffffffffff..." is the first line once the screen turns back on. i915.fastboot=1 is set in kernel cmdline, didn't make any difference. Resolution is visually the same before and after the mode change. [ 1.202214] fb0: switching to inteldrmfb from EFI VGA [ 1.204981] Console: switching to colour dummy device 80x25 [ 1.205002] i915 0000:00:02.0: vgaarb: deactivate vga console [ 1.257470] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013). [ 1.257523] i915 0000:00:02.0: vgaarb: changed VGA decodes: olddecodes=io+mem,decodes=io+mem:owns=io+mem [ 1.258039] i915 0000:00:02.0: [drm] Finished loading DMC firmware i915/kbl_dmc_ver1_04.bin (v1.4) [ 1.266513] i915 0000:00:02.0: [drm] Panel advertises DPCD backlight support, but VBT disagrees. If your backlight controls don't work try booting with i915.enable_dpcd_backlight=1. If your machine needs this, please file a _new_ bug report on drm/i915, see https://gitlab.freedesktop.org/drm/intel/-/wikis/How-to-file-i915-bugs for details. [ 1.278853] [drm] Initialized i915 1.6.0 20200515 for 0000:00:02.0 on minor 0 [ 1.388057] usb 1-9: new high-speed USB device number 2 using xhci_hcd [ 1.528528] usb 4-1: new SuperSpeed Gen 1 USB device number 2 using xhci_hcd [ 1.543379] usb 1-9: New USB device found, idVendor=2109, idProduct=2812, bcdDevice= d.a0 [ 1.543392] usb 1-9: New USB device strings: Mfr=1, Product=2, SerialNumber=0 [ 1.543399] usb 1-9: Product: USB2.0 Hub [ 1.543404] usb 1-9: Manufacturer: VIA Labs, Inc. [ 1.544575] hub 1-9:1.0: USB hub found [ 1.545569] hub 1-9:1.0: 4 ports detected [ 1.564060] tsc: Refined TSC clocksource calibration: 2303.993 MHz [ 1.564082] clocksource: tsc: mask: 0xffffffffffffffff max_cycles: 0x2135f10e1ea, max_idle_ns: 440795202126 ns -- 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/1836858 Title: Display flickers (monitor loses signal briefly) during "flickerfree" boot, while showing the BIOS logo on a black background Status in Plymouth: Unknown Status in linux package in Ubuntu: Confirmed Status in plymouth package in Ubuntu: Confirmed Bug description: I am trying flickerfree boot in 19.10 [1], but find it actually flickers part way through: 1. BIOS logo on a black background. 2. Display mode resets, no image on a black background briefly. 3. BIOS logo on a black background. The flicker occurs seemingly during kernel startup since my peripherals are lit up before the problem occurs. Suspecting this might be related to FB handover: [ 2.751028] fb0: switching to inteldrmfb from EFI VGA I tried disabling that with a big hammer: i915.modeset=0 so it stays in efifb, and that works -- no more flickering, providing I don't let i915 take over the framebuffer. [1] https://discourse.ubuntu.com/t/testing-flickerfree-boot/11854 ProblemType: Bug DistroRelease: Ubuntu 19.10 Package: linux-image-5.2.0-8-generic 5.2.0-8.9 ProcVersionSignature: Ubuntu 5.2.0-8.9-generic 5.2.0 Uname: Linux 5.2.0-8-generic x86_64 ApportVersion: 2.20.11-0ubuntu5 Architecture: amd64 AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', '/dev/snd/controlC0', '/dev/snd/hwC0D2', '/dev/snd/hwC0D0', '/dev/snd/pcmC0D9p', '/dev/snd/pcmC0D8p', '/dev/snd/pcmC0D7p', '/dev/snd/pcmC0D3p', '/dev/snd/pcmC0D2c', '/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: Date: Wed Jul 17 16:34:36 2019 InstallationDate: Installed on 2019-05-02 (76 days ago) InstallationMedia: Ubuntu 19.10 "Eoan EANIMAL" - Alpha amd64 (20190501) MachineType: LENOVO 10M7CTO1WW ProcFB: 0 i915drmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.2.0-8-generic root=UUID=9bfb5f01-bdd4-4854-bfce-1c28e2f2f3bc ro quiet splash i915.fastboot=1 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-5.2.0-8-generic N/A linux-backports-modules-5.2.0-8-generic N/A linux-firmware 1.180 SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 02/06/2018 dmi.bios.vendor: LENOVO dmi.bios.version: M16KT47A dmi.board.name: 3102 dmi.board.vendor: LENOVO dmi.board.version: SDK0J40709 WIN 3259627060530 dmi.chassis.type: 3 dmi.chassis.vendor: LENOVO dmi.chassis.version: None dmi.modalias: dmi:bvnLENOVO:bvrM16KT47A:bd02/06/2018:svnLENOVO:pn10M7CTO1WW:pvrThinkCentreM710s:rvnLENOVO:rn3102:rvrSDK0J40709WIN3259627060530:cvnLENOVO:ct3:cvrNone: dmi.product.family: ThinkCentre M710s dmi.product.name: 10M7CTO1WW dmi.product.sku: LENOVO_MT_10M7_BU_Think_FM_ThinkCentre M710s dmi.product.version: ThinkCentre M710s dmi.sys.vendor: LENOVO To manage notifications about this bug go to: https://bugs.launchpad.net/plymouth/+bug/1836858/+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
