HDMI output on Lenovo Carbon X1 Extreme stopped working after upgrading kernel to 5.4.0

Graphics / Linux Linux
1

Hi,

I upgraded my Lenovo Carbon X1 Extreme Gen 2 with Ubuntu 20.04 to kernel 5.4.0.48 and after reboot, the HDMI output stopped working.

Here’s the update (/var/log/apt/history.log):

Start-Date: 2020-09-22  09:11:03
Commandline: aptdaemon role='role-commit-packages' sender=':1.614'
Install: linux-headers-5.4.0-48-generic:amd64 (5.4.0-48.52, automatic), linux-modules-extra-5.4.0-48-generic:amd64 (5.4.0-48.52, automatic), linux-modules-5.4.0-48-generic:amd64 (5.4.0-48.52, automatic), linux-headers-5.4.0-48:amd64 (5.4.0-48.52, automatic), linux-image-5.4.0-48-generic:amd64 (5.4.0-48.52, automatic)
Upgrade: fdisk:amd64 (2.34-0.1ubuntu9, 2.34-0.1ubuntu9.1), linux-headers-generic-hwe-20.04:amd64 (5.4.0.47.50, 5.4.0.48.51), uuid-runtime:amd64 (2.34-0.1ubuntu9, 2.34-0.1ubuntu9.1), libfdisk1:amd64 (2.34-0.1ubuntu9, 2.34-0.1ubuntu9.1), linux-libc-dev:amd64 (5.4.0-47.51, 5.4.0-48.52), alsa-ucm-conf:amd64 (1.2.2-1ubuntu0.2, 1.2.2-1ubuntu0.3), grub-common:amd64 (2.04-1ubuntu26.3, 2.04-1ubuntu26.4), libmount1:amd64 (2.34-0.1ubuntu9, 2.34-0.1ubuntu9.1), rhythmbox-plugin-alternative-toolbar:amd64 (0.19.3-1, 0.19.3-1.1), language-selector-common:amd64 (0.204, 0.204.1), util-linux:amd64 (2.34-0.1ubuntu9, 2.34-0.1ubuntu9.1), grub2-common:amd64 (2.04-1ubuntu26.3, 2.04-1ubuntu26.4), initramfs-tools-bin:amd64 (0.136ubuntu6.2, 0.136ubuntu6.3), linux-image-generic-hwe-20.04:amd64 (5.4.0.47.50, 5.4.0.48.51), grub-pc:amd64 (2.04-1ubuntu26.3, 2.04-1ubuntu26.4), mount:amd64 (2.34-0.1ubuntu9, 2.34-0.1ubuntu9.1), linux-generic-hwe-20.04:amd64 (5.4.0.47.50, 5.4.0.48.51), grub-pc-bin:amd64 (2.04-1ubuntu26.3, 2.04-1ubuntu26.4), libblkid1:amd64 (2.34-0.1ubuntu9, 2.34-0.1ubuntu9.1), grub-efi-amd64-bin:amd64 (2.04-1ubuntu26.3, 2.04-1ubuntu26.4), im-config:amd64 (0.44-1ubuntu1.1, 0.44-1ubuntu1.2), libuuid1:amd64 (2.34-0.1ubuntu9, 2.34-0.1ubuntu9.1), chromium-codecs-ffmpeg-extra:amd64 (84.0.4147.105-0ubuntu0.20.04.1, 1:85.0.4183.83-0ubuntu0.20.04.1), libsmartcols1:amd64 (2.34-0.1ubuntu9, 2.34-0.1ubuntu9.1), rfkill:amd64 (2.34-0.1ubuntu9, 2.34-0.1ubuntu9.1), bsdutils:amd64 (1:2.34-0.1ubuntu9, 1:2.34-0.1ubuntu9.1), grub-efi-amd64-signed:amd64 (1.142.5+2.04-1ubuntu26.3, 1.142.6+2.04-1ubuntu26.4), language-selector-gnome:amd64 (0.204, 0.204.1), initramfs-tools-core:amd64 (0.136ubuntu6.2, 0.136ubuntu6.3), initramfs-tools:amd64 (0.136ubuntu6.2, 0.136ubuntu6.3)
End-Date: 2020-09-22  09:12:22

My setup:

  • Lenovo X1 Carbon Extreme Gen 2
  • Ubuntu 20.04.1 LTS
  • GPU: GeForce GTX 1650 Mobile / Max-Q
  • Nvidia drivers: nvidia-driver-450

nvidia-bug-report.sh output:
nvidia-bug-report.log (1.6 MB)

My logs (/var/log/Xorg.1.log) had this :

[192858.467] (--) NVIDIA(GPU-0): Acer S277HK (DFP-2): connected
[192858.467] (--) NVIDIA(GPU-0): Acer S277HK (DFP-2): Internal TMDS
[192858.468] (--) NVIDIA(GPU-0): Acer S277HK (DFP-2): 600.0 MHz maximum pixel clock
[192858.468] (--) NVIDIA(GPU-0): 
[193042.694] (EE) 
[193042.694] (EE) Backtrace:
[193042.697] (EE) 0: /usr/lib/xorg/Xorg (OsLookupColor+0x13c) [0x562fbea2f11c]
[193042.698] (EE) 1: /lib/x86_64-linux-gnu/libpthread.so.0 (funlockfile+0x60) [0x7fc803fd341f]
[193042.698] (EE) 2: /lib/x86_64-linux-gnu/nvidia/xorg/nvidia_drv.so (nvidiaAddDrawableHandler+0x456da0) [0x7fc8037835e0]
[193042.698] (EE) 
[193042.698] (EE) Segmentation fault at address 0x8
[193042.698] (EE) 
Fatal server error:
[193042.698] (EE) Caught signal 11 (Segmentation fault). Server aborting
[193042.698] (EE) 
[193042.698] (EE) 
Please consult the The X.Org Foundation support 
	 at http://wiki.x.org
 for help. 
[193042.698] (EE) Please also check the log file at "/var/log/Xorg.1.log" for additional information.
[193042.698] (EE) 
[193042.698] (EE) 
[193042.698] (EE) Backtrace:
[193042.698] (EE) 0: /usr/lib/xorg/Xorg (OsLookupColor+0x13c) [0x562fbea2f11c]
[193042.699] (EE) 1: /lib/x86_64-linux-gnu/libpthread.so.0 (funlockfile+0x60) [0x7fc803fd341f]
[193042.699] (EE) 2: /lib/x86_64-linux-gnu/nvidia/xorg/nvidia_drv.so (nvidiaAddDrawableHandler+0x456d8c) [0x7fc8037835b8]
[193042.699] (EE) 
[193042.699] (EE) Bus error at address 0x0
[193042.699] (EE) 
FatalError re-entered, aborting
[193042.699] (EE) Caught signal 7 (Bus error). Server aborting
[193042.699] (EE)