We have several Proxmox servers currently in the process of upgrading from 1.9 to 2.3. We manage these servers with Intel AMT (remote management technology built into Q67/Q77 motherboards), and up until now with Proxmox 1.x there were no problems using the 80x25 character remote console.
Apparently Proxmox 2.x or Debian switches to a higher resolution console during boot, which uses a screen mode that is somehow incompatible with the VNC session used by Intel AMT. If we have a monitor plugged into the motherboard than it's working, but if only AMT is used than console goes black, the VNC client warns about an "unsupported or inactive display adapter" and disconnects.
We have experimented with setting different console modes in grub, but it's not affecting this problem.
Is there a way to set the console to the previously used 80x25 character mode?
Apparently Proxmox 2.x or Debian switches to a higher resolution console during boot, which uses a screen mode that is somehow incompatible with the VNC session used by Intel AMT. If we have a monitor plugged into the motherboard than it's working, but if only AMT is used than console goes black, the VNC client warns about an "unsupported or inactive display adapter" and disconnects.
We have experimented with setting different console modes in grub, but it's not affecting this problem.
Is there a way to set the console to the previously used 80x25 character mode?
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