I remember seeing this issue on a mailing list a while back related to Cinnamon settings causing it; the solution there was to go into the settings and turn off the option to rotate the screen by default. 
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J.D AUSTIN
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On Sat, Jul 31, 2021 at 10:24 AM greg zegan via PLUG-discuss <plug-discuss@lists.phxlinux.org> wrote:
Hello,
  The other day I installed a fresh copy of Debian 10 on my HP 840 laptop.  Previously I had Debian 9 on it and had a kernel
panic error which crashed the system.  I ran the fdsk command to try and restore it but as of today its still down.

I put in a new hard drive and ran through the install.  Now when I try and log in the screen is upside down.  I am not sure what happened.  Maybe the OS thinks this is a computer pad device or something.  Does anyone know how I can fix this?  I can log in as 
either root or myself.

please advise.
thanks,
Greg

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