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Upgrade to Jessie lost all monitor resolutions except 1024x768

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I have been holding off on upgrading to Jessie, but I decided that it 
was time to at least try it out.

I made a copy of my current system in unused space on my disk and 
updated lilo.  After verifying that I could boot into both setups, I 
upgraded the copy to Jessie after installing sysvinit-core to avoid 
systemd.  It boots and lets me log in on multiple consoles as different 
users.  Each user can run startx and gets their own session on separate 
vts specific to the user.  This was my big question, and it seems to 
work fine.  (We'll have to see about Jessie+1, it seems.)

My problem now is screen resolution.  All I get is 1024x768.  Under 
Wheezy I get 15 different resolutions from 720x400 and 640x480 up to 
1920x1080.  Jessie says that the monitor is "Unknown" and only allows me 
to use 1024x768.  How do I get X to recognize my monitor under Jessie?

Marc

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Upgrade to Jessie lost all monitor resolutions except 1024x768 Marc Shapiro <marcnshap@gmail.com> - 2015-11-30 22:30 +0100
  Re: Upgrade to Jessie lost all monitor resolutions except 1024x768 Marc Shapiro <marcnshap@gmail.com> - 2015-11-30 23:30 +0100
    Re: Upgrade to Jessie lost all monitor resolutions except 1024x768 Ansgar Burchardt <"Ansgar Burchardt"@43-1.org> - 2015-11-30 23:40 +0100
      Re: Upgrade to Jessie lost all monitor resolutions except 1024x768 Marc Shapiro <marcnshap@gmail.com> - 2015-12-01 00:10 +0100
        Re: Upgrade to Jessie lost all monitor resolutions except 1024x768 Felix Miata <mrmazda@earthlink.net> - 2015-12-01 01:00 +0100
  Re: Upgrade to Jessie lost all monitor resolutions except 1024x768 Mike Kupfer <m.kupfer@acm.org> - 2015-12-01 01:20 +0100

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