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Laptop display goes blank after update

br flag

I have an hp elitebook 840 g5 with an intel i5 8th gen cpu. I have found that the stock kernel for Ubuntu 20.04.03 will not correctly enable the backlight on the laptop screen. The screen will show the hp logo and then go black. If I connect a monitor and change the display, I can see the desktop.

I have found that if I install the mainline ppa and install mainline kernel 5.10, 5.8 or 5.4 kernel the screen works.

I don't think that this is a hardware issue, but I would like to know if there is something I can do without having to use the mainline kernels to get the laptop screen to work.

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