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USB Boot on Netbook - keyboard locks up, with external monitor

Posted: Mon Dec 18, 2017 1:50 pm
by linuxwhatthe
Hi,

Using an HD15 monitor and cable, and a usb keyboard on a Toshiba Netbook; and booting from a usb drive -

Whenever the monitor (tv, in this case) is connected, the keyboard locks up. I can't click on anything, from the external keyboard, or from the Netbook keyboard. As soon as I disconnect the monitor, I can click and type directly on the Netbook screen.

Do you have any idea, where I should look first?


Regards,

Re: USB Boot on Netbook - keyboard locks up, with external monitor

Posted: Mon Dec 18, 2017 7:15 pm
by ClixTrix
Could be a bad cable or bad port at either end of the HD15 cable.

I suggest the following tests:

1) Disconnecting the HD15 cable at the Netbook end (assumed) appears to clear the problem. Check if disconnect from Monitor end does the same. If it doesn't, do you have another cable to test.

2) Test with TV Monitor turned OFF and HD15 connected at both ends.

3) Test with the external keyboard disconnected.

Since you are booting from USB, is there an OS installed that you can boot and test the TV Monitor?

Re: USB Boot on Netbook - keyboard locks up, with external monitor

Posted: Wed Dec 20, 2017 11:02 am
by linuxwhatthe
"Could be a bad cable or bad port at either end of the HD15 cable."

Definitely not. The monitor works fine, with other operating systems. For example, I have FreeDos on a flash drive, and the there's no locking up.


I suggest the following tests:

"1) Disconnecting the HD15 cable at the Netbook end (assumed) appears to clear the problem. Check if disconnect from Monitor end does the same. If it doesn't, do you have another cable to test."

Already done. Disconnecting does indeed bring back keyboard access. Also, I've tried 2 other cables, with the same results. And all 3 cables work fine, when booting up elsewhere. Also, the Netbook itself is Windows 7; the keyboard lockup doesn't happen, when using the same external monitor and the same cable.


"2) Test with TV Monitor turned OFF and HD15 connected at both ends."

Interesting. I'll try, to see what happens.


"3) Test with the external keyboard disconnected."

I might have tried this, but will do so again.


"Since you are booting from USB, is there an OS installed that you can boot and test the TV Monitor?"

Yes. Already confirmed that it worked fine with 2 other operating systems.


Ok, thanks. I'll try those other two suggestions, just to get a few extra facts down, that might hint at a reason.