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I'm using 3 monitors 1920x1080 (laptop and two external) on Ubuntu 21.04. After kernel upgrade from 5.11.0-18-generic to 5.11.0-25-generic the built-in monitor started to show only a black screen, the two other monitors work properly. If I try to start only with a laptop monitor it shows the black screen too. If I use a previous version of the kernel it works properly.

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  • Compare /lib/modules/5.11.0-18-generic and /lib/modules/5.11.0-25-generic folders - maybe you lost some custom modules used in previous kernel.
    – Serg
    Jul 23, 2021 at 9:17
  • I'm having exactly the same issue but with Worksation and 3 1080p monitors (2x DP 1x DVI) With 5.8.0-63 it's working fine, with 5.11.0-25 only one screen starts black with the cursor. I'm currently using 2x Quadro 2000/2000D with Nvidia driver and Mosaic in order to be able to support 3 screens as the Quadro 2000 only supports 1 screen. It doesn't seem to be anything kernel modules related. I had plenty of issues setting up the Mosaic and the 3 screens so should be something more Xorg/Nvidia related.
    – Deus
    Aug 16, 2021 at 18:08
  • root@Z600W:/lib/modules# ls -lA 5.11.0-25-generic/ | awk -F':[0-9]* ' '/:/{print $2}' build -> /usr/src/linux-headers-5.11.0-25-generic initrd kernel misc modules.alias modules.alias.bin modules.builtin modules.builtin.alias.bin modules.builtin.bin modules.builtin.modinfo modules.dep modules.dep.bin modules.devname modules.order modules.softdep modules.symbols modules.symbols.bin vdso
    – Deus
    Aug 16, 2021 at 18:12
  • root@Z600W:/lib/modules# ls -lA 5.8.0-63-generic/ | awk -F':[0-9]* ' '/:/{print $2}' build -> /usr/src/linux-headers-5.8.0-63-generic initrd kernel misc modules.alias modules.alias.bin modules.builtin modules.builtin.alias.bin modules.builtin.bin modules.builtin.modinfo modules.dep modules.dep.bin modules.devname modules.order modules.softdep modules.symbols modules.symbols.bin updates vdso
    – Deus
    Aug 16, 2021 at 18:12
  • This is what I've got during an apt upgrade booting with the 5.8.x kernel: Building module: cleaning build area... [ ! -h /usr/bin/cc ] && export CC=/usr/bin/gcc; make -k module KERNDIR=/lib/modules/5.11.0- 27-generic IGNORE_XEN_PRESENCE=1 IGNORE_CC_MISMATCH=1 SYSSRC=/lib/modules/5.11.0-27-generic /build LD=/usr/bin/ld.bfd; make -C uvm module KERNEL_UNAME=5.11.0-27-generic KBUILD_EXTMOD= /var/lib/dkms/nvidia-340/340.108/build/uvm............. It looks like the issue is nvidia driver related.
    – Deus
    Aug 20, 2021 at 13:21

1 Answer 1

Reset to default
0

edit /etc/default/grub

change GRUB_DEFAULT=0 to GRUB_DEFAULT="1>2"

run cmd update-grub and reboot

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  • edit /etc/default/grub GRUB_DEFAULT="" GRUB_CMDLINE_LINUX_DEFAULT="nomodeset" GRUB_CMDLINE_LINUX="nomodeset" run cmd update-grub and reboot
    – rh9
    Sep 3, 2021 at 19:46

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