I'm on ubuntu 18.04, and my laptop is a dell inspiron 15 5000 series with a intel core i7-7500u cpu and a radeon graphics card: VGA compatible controller: Intel Corporation HD Graphics 620 (rev 02) (prog-if 00 [VGA controller]) Topaz XT [Radeon R7 M260/M265 / M340/M360 / M440/M445].
I usually use a second monitor connected trough the hdmi port and every time I disconnect it, my laptop froze and I have to hard reboot...
I did a search, but most problems I found are when connecting a monitor. Any help will be appreciated.
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