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Issues with HDMI output
(slrpnk.net)
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this post was submitted on 19 Nov 2024
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Oops! I thought it was some obscure DE.
Considering your points, it seems to be most probably some configuration issue.
Might even be that some of the automated monitor/display configuration tools (might be some GUI settings thing) wonked out and reconfigured something.
If your system has some shortcut combination for selecting external monitor/connected projector/mirror screen, perhaps you can try that.
Also, since you mentioned
xrandr, I would assume X Session. You can also usexrandrto check and set the monitor configuration. Not just whether it is connected, but also location (left/right/up/down) and screen resolution of each display separately. Perhaps trying those could tell you what is happening.