[Bug 1836858] Re: Display flickers (monitor loses signal briefly) during "flickerfree" boot, while showing the BIOS logo on a black background
** Changed in: plymouth Status: Unknown => New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to 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 To manage notifications about this bug go to: https://bugs.launchpad.net/plymouth/+bug/1836858/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1836858] Re: Display flickers (monitor loses signal briefly) during "flickerfree" boot, while showing the BIOS logo on a black background
** Tags removed: groovy -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to 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 To manage notifications about this bug go to: https://bugs.launchpad.net/plymouth/+bug/1836858/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1836858] Re: Display flickers (monitor loses signal briefly) during "flickerfree" boot, while showing the BIOS logo on a black background
Yeah the problem seems to be getting worse in recent Ubuntu releases and is more obvious on more laptops. That's good for testing at least. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to 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 To manage notifications about this bug go to: https://bugs.launchpad.net/plymouth/+bug/1836858/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1836858] Re: Display flickers (monitor loses signal briefly) during "flickerfree" boot, while showing the BIOS logo on a black background
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: 0x..." 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 :00:02.0: vgaarb: deactivate vga console [1.257470] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013). [1.257523] i915 :00:02.0: vgaarb: changed VGA decodes: olddecodes=io+mem,decodes=io+mem:owns=io+mem [1.258039] i915 :00:02.0: [drm] Finished loading DMC firmware i915/kbl_dmc_ver1_04.bin (v1.4) [1.266513] i915 :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 :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: 0x max_cycles: 0x2135f10e1ea, max_idle_ns: 440795202126 ns -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to 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 To manage notifications about this bug go to: https://bugs.launchpad.net/plymouth/+bug/1836858/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1836858] Re: Display flickers (monitor loses signal briefly) during "flickerfree" boot, while showing the BIOS logo on a black background
Changed desktop monitors and the problem is now less severe, but still present. I guess it's all to do with how fast the monitor can change modes. And that a mode change is occurring at all. Although it seems to be the same resolution. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to 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 To manage notifications about this bug go to: https://bugs.launchpad.net/plymouth/+bug/1836858/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1836858] Re: Display flickers (monitor loses signal briefly) during "flickerfree" boot, while showing the BIOS logo on a black background
Thanks for the suggestion. Unfortunatley vt.handoff=1 did not improve the situation. ** Tags added: groovy -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to 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 To manage notifications about this bug go to: https://bugs.launchpad.net/plymouth/+bug/1836858/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1836858] Re: Display flickers (monitor loses signal briefly) during "flickerfree" boot, while showing the BIOS logo on a black background
Just throwing this into the ring... try replacing $vt_handoff in the grub kernel line with vt.handoff=1 (from 18.04 to 20.04 it seems to have been changed from 1 to 7 to make the handoff to plymouth more fluid as it loads its own copy of the firmware splash to draw on). -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to 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 To manage notifications about this bug go to: https://bugs.launchpad.net/plymouth/+bug/1836858/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1836858] Re: Display flickers (monitor loses signal briefly) during "flickerfree" boot, while showing the BIOS logo on a black background
Done: https://gitlab.freedesktop.org/plymouth/plymouth/-/issues/102 ** Bug watch added: gitlab.freedesktop.org/plymouth/plymouth/-/issues #102 https://gitlab.freedesktop.org/plymouth/plymouth/-/issues/102 ** Also affects: plymouth via https://gitlab.freedesktop.org/plymouth/plymouth/-/issues/102 Importance: Unknown Status: Unknown ** Changed in: plymouth (Ubuntu) Status: New => Confirmed ** Changed in: plymouth (Ubuntu) Importance: Undecided => Low -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to 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 To manage notifications about this bug go to: https://bugs.launchpad.net/plymouth/+bug/1836858/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1836858] Re: Display flickers (monitor loses signal briefly) during "flickerfree" boot, while showing the BIOS logo on a black background
Daniel, could get a debug log and report upstream? https://wiki.ubuntu.com/Plymouth#Enabling_Debugging -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to 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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1836858/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
