cannot use external monitor for my laptop

[vicky]

My normal usage of the laptop (so far with Windows) is to keep the lid closed and use an external monitor and keyboard+mouse. Monitor connected via VGA.

This fails with Haiku. Say, plug in the external monitor, nothing shows up on it. If I restart, close the lid, then initially stuff shows on external, but after choosing Haiku to boot (I use dual boot), and past the row of icons, the screen turns black. The laptop's screen doesn't turn on either. I have to turn off from power button and start again, now with the external monitor disconnected, in order to get laptop's screen on till Haiku is on.

At some points, I managed to show stuff on external, by plugging/unplugging during booting at various points around the boot menu, or after first getting into the boot loader options, but I can't replicate it.

I tried all suggestions here ​https://discuss.haiku-os.org/t/solved-can-i-use-an-external-monitor-with-my-laptop/7977 , nothing works. By the way, that should not be marked as solved.

In particular, I tried making it use the VESA fall-back driver, and while it shows on external monitor, the resolution is not the right one.

This problem is probably the main reason I can't continue to use Haiku...

Thanks, Vic