Re: [Xen-devel] Intel IGP VGA-passthrough to Ubuntu 11.04/openSUSE domU doesn't quite work

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Mon, Aug 29, 2011 at 05:50:23PM +0200, Martin Meier wrote:
> Hi,
> when comparing the dmesgs from a Ubuntu 11.04+xorg-edgers-ppa running on real
> hardware ver. running in a HVM-domU, I see this change in dmesg:
> 
> real:
> [    2.306326] [drm:intel_wait_for_vblank], vblank wait timed out
> [    2.307140] [drm:gen6_fdi_link_train], FDI_RX_IIR 0x700
> [    2.307143] [drm:gen6_fdi_link_train], FDI train 1 done.
> [    2.307798] [drm:gen6_fdi_link_train], FDI_RX_IIR 0x600
> [    2.307801] [drm:gen6_fdi_link_train], FDI train 2 done.
> [    2.307802] [drm:gen6_fdi_link_train], FDI train done.
> 
> domU:
> [    3.658150] [drm:intel_wait_for_vblank], vblank wait timed out
> [    3.658962] [drm:gen6_fdi_link_train], FDI_RX_IIR 0x700
> [    3.658966] [drm:gen6_fdi_link_train], FDI train 1 done.
> [    3.659625] [drm:gen6_fdi_link_train], FDI_RX_IIR 0x0
> [    3.660129] [drm:gen6_fdi_link_train], FDI_RX_IIR 0x0
> [    3.660633] [drm:gen6_fdi_link_train], FDI_RX_IIR 0x0
> [    3.661137] [drm:gen6_fdi_link_train], FDI_RX_IIR 0x0
> [    3.661140] [drm:gen6_fdi_link_train] *ERROR* FDI train 2 fail!
> [    3.661142] [drm:gen6_fdi_link_train], FDI train done.
> 
> The desktop looks OK on real hardware.
> In a domU the display shows 'no signal' and turns it self off during
> the boot process.
> The domU stays up and does not crash, oops, seg-faults, etc.
> 
> I've tried
> chvt 1 / 7
> xset dpms force off / on
> xrandr  --off / --auto
> with no visible change.
> 
> Hardware:
> DQ67SW (vt-d enabled)
> i5 2400
> Display connected via DVI-D / DVI-I+VGA adapter
> 
> Software:
> domU kernel: 3.1.0-rc3 x86 32 bit
> dom0 kernel: 3.0.3
> (git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen.git) x86_64

An you have CONFIG_DMAR enabled?

> xen 4.2-unstable (xen_changeset          : Thu Aug 25 12:03:14 2011
> +0100 23791:227130622561)
> 
> 
> A short test with openSUSE-NET-Build0136-x86_64.iso shows the same behaviour.
> 
> On the other hand, XP-SP3 with the GFX_XP32_6.14.10.5361_PV.exe works
> quite well with the same configuration.

That is pretty neat.
> 
> Thanks,
> Martin
> 
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