Last Week i was at the datacenter where my server is located. I tought i try with boot from usb stick, then it worked. I had another idea just to double check this issue. I was not connected via ipmi viewer, just connected an iso via ipmi webinterface and had the same issue with 800x600 via...
Sorry for digging up an old thread, hope that helps someone.
I got the same problems with HP MicroServer Gen8 (Broadcom BCM5720 network cards) and Proxmox 4.1
I ended up disabling all offload features on all network cards
apt-get install ethtool
ethtool --offload eth0 gso off tso off sg off...
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