SOLVED: Ignore this, it was a defective EDID that triggered a chain reaction of problems trying to fix that... 
Proxmox 6 works great and IGD passthrough works fine as before!
Hello, I pass the host's integrated gpu (Intel G4400 cpu, skylake) to some vms, linux and win ones.
They were working great for months, even the HD Audio through HDMI. It was a pain to setup but in 5.4 everything worked fine, IIRC in legacy mode.
Until I did a dist upgrade before upgrading to 6 and that broke it.
Stupidly went through the 6 upgrade instead of trying to trace the problem, so now everything is different.
The linux guests don't load the card no matter legacy or upt mode or whatever combo of args i provide. No output to the HDMI monitor, black screen, no display, errors like "EDID is invalid", HDMI or DP shows as disconnected, "[i915]] *ERROR* DC state mismatch (0x0 -> 0x2)", detecting wrong monitor resolution are some of the things I'm getting.
If I don't pass the integrated card, vms work correctly.
More likely something qemu/i915/IGD specific.
Updated to proxmox 6 and still broken. Except a win7 vm that still runs perfectly and weirdly was unaffected by all of this, it outputs fine to the displayport and everything works. Tried to use its args/conf in other vms but no way.
The ubuntu and win10 ones don't want to use the card. Win7 is the only one working.
Anyone with similar experience?
Proxmox 6 works great and IGD passthrough works fine as before!
They were working great for months, even the HD Audio through HDMI. It was a pain to setup but in 5.4 everything worked fine, IIRC in legacy mode.
Until I did a dist upgrade before upgrading to 6 and that broke it.
Stupidly went through the 6 upgrade instead of trying to trace the problem, so now everything is different.
The linux guests don't load the card no matter legacy or upt mode or whatever combo of args i provide. No output to the HDMI monitor, black screen, no display, errors like "EDID is invalid", HDMI or DP shows as disconnected, "[i915]] *ERROR* DC state mismatch (0x0 -> 0x2)", detecting wrong monitor resolution are some of the things I'm getting.
If I don't pass the integrated card, vms work correctly.
More likely something qemu/i915/IGD specific.
Updated to proxmox 6 and still broken. Except a win7 vm that still runs perfectly and weirdly was unaffected by all of this, it outputs fine to the displayport and everything works. Tried to use its args/conf in other vms but no way.
The ubuntu and win10 ones don't want to use the card. Win7 is the only one working.
Anyone with similar experience?
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