Graphics Passthrough works in Seabios but not OVMF.

[Mysticle31]

Trying to pass an integrated Haswell GPU to some VMs.  It will work great in Seabios but OVMF just displays a blank screen. 

Why?  Where is the best place to begin debugging?

 

When I start the VM with a monitor in sleep mode, I can see the monitor power on display no signal and then go back to sleep. Which is what I want to do in the mornings sometimes!

I've read that sometimes Seabios is harder to get working than OVMF.  Wonder of OVMF requires a vbios which I do not have....

 

 

Except from my syslog says

Quote

Oct 22 08:12:31 Tower kernel: Code.... blah blah blah..
Oct 22 13:09:49 Tower kernel: vfio-pci 0000:00:02.0: vgaarb: changed VGA decodes: olddecodes=io+mem,decodes=io+mem:owns=io+mem
Oct 22 13:09:49 Tower kernel: br0: port 2(vnet0) entered blocking state
Oct 22 13:09:49 Tower kernel: br0: port 2(vnet0) entered disabled state
Oct 22 13:09:49 Tower kernel: device vnet0 entered promiscuous mode
Oct 22 13:09:49 Tower kernel: br0: port 2(vnet0) entered blocking state
Oct 22 13:09:49 Tower kernel: br0: port 2(vnet0) entered forwarding state
Oct 22 13:09:51 Tower avahi-daemon[5583]: Joining mDNS multicast group on interface vnet0.IPv6 with address fe80::fc54:ff:fe3a:93f4.
Oct 22 13:09:51 Tower avahi-daemon[5583]: New relevant interface vnet0.IPv6 for mDNS.
Oct 22 13:09:51 Tower avahi-daemon[5583]: Registering new address record for fe80::fc54:ff:fe3a:93f4 on vnet0.*.
Oct 22 13:09:52 Tower kernel: resource sanity check: requesting [mem 0x000c0000-0x000dffff], which spans more than PCI Bus 0000:00 [mem 0x000d0000-0x000d3fff window]
Oct 22 13:09:53 Tower kernel: caller pci_map_rom+0x7a/0x15e mapping multiple BARs

 

Edited October 22, 2020 by Mysticle31

[Ly0nx]

Same question here. last Re has been "Google translated", sry 

Edited May 3, 2021 by Ly0nx

[JorgeB]

On 5/2/2021 at 9:35 AM, Ly0nx said:

这里同样的问题。

Please use English only here, alternatively you can use the Chinese section.