HDMI output from nvidia graphic card is not working

My laptop is Dell G7 7700 with NVIDIA GeForce RTX 2070 8GB. It is running Ubuntu 18.04.
CUDA 11.5 and Driver 495.29.05 are installed. But there is no response when I connect the external monitor via the hdmi port.

Please run nvidia-bug-report.sh as root and attach the resulting nvidia-bug-report.log.gz file to your post.

here is my log.gz. Thanks.

The kernel you’re running is much too old to support your intel igpu which controls graphics. Any specific reason to run 18.04?
As a first measure, you should upgrade to kernel 5.4
https://wiki.ubuntu.com/Kernel/LTSEnablementStack
but I’m not sure if this is new enough.

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