Intel iGPU passthough

ovicz

@vhaelan Hello. What's the output of rpm -qa | grep intel-gpu-firmware ?

vhaelan

rpm -qa | grep intel-gpu-firmware

Hello @ovicz, I see the following: intel-gpu-firmware-20251021-1.fc43.noarch

ovicz

@vhaelan Is the intel graphics module loaded ?

lsmod | grep i915
i915 5373952 24
drm_buddy 32768 2 xe,i915
ttm 135168 3 drm_ttm_helper,xe,i915
i2c_algo_bit 20480 2 xe,i915
drm_display_helper 331776 2 xe,i915
cec 106496 3 drm_display_helper,xe,i915
video 81920 2 xe,i91

sudo dmesg | grep i915
[ 5.855595] i915 0000:00:08.0: [drm] Found alderlake_p/alderlake_n (device ID 46d1) integrated display version 13.00 stepping D0
[ 5.858477] i915 0000:00:08.0: [drm] VT-d active for gfx access
[ 5.858739] i915 0000:00:08.0: [drm] Using Transparent Hugepages
[ 5.859307] i915 0000:00:08.0: Invalid PCI ROM header signature: expecting 0xaa55, got 0x4556
[ 5.859312] i915 0000:00:08.0: [drm] Failed to find VBIOS tables (VBT)
[ 5.860012] i915 0000:00:08.0: vgaarb: VGA decodes changed: olddecodes=io+mem,decodes=none:owns=io+mem
[ 5.878556] i915 0000:00:08.0: [drm] Finished loading DMC firmware i915/adlp_dmc.bin (v2.20)
[ 7.806109] i915 0000:00:08.0: [drm] [ENCODER:204:DDI A/PHY A] failed to retrieve link info, disabling eDP
[ 7.843768] i915 0000:00:08.0: [drm] GT0: GuC firmware i915/tgl_guc_70.bin version 70.49.4
[ 7.843776] i915 0000:00:08.0: [drm] GT0: HuC firmware i915/tgl_huc.bin version 7.9.3
[ 7.849282] i915 0000:00:08.0: [drm] GT0: HuC: authenticated for all workloads
[ 7.850868] i915 0000:00:08.0: [drm] GT0: GUC: submission enabled
[ 7.850874] i915 0000:00:08.0: [drm] GT0: GUC: SLPC enabled
[ 7.851225] i915 0000:00:08.0: [drm] GT0: GUC: RC enabled
[ 7.852797] i915 0000:00:08.0: [drm] Protected Xe Path (PXP) protected content support initialized
[ 7.854314] i915 0000:00:08.0: [drm] Registered 3 planes with drm panic
[ 7.854318] [drm] Initialized i915 1.6.0 for 0000:00:08.0 on minor 1

Also see in /etc/default/grub if there is NOMODESET in GRUB_CMDLINE_LINUX line.

That's from my Fedora 43 vm with passthrough enabled.

vhaelan

@ovicz Yes, it's loaded

lsmod | grep i915
i915                 5373952  0
i2c_algo_bit           20480  2 xe,i915
drm_buddy              32768  2 xe,i915
video                  81920  2 xe,i915
ttm                   135168  3 drm_ttm_helper,xe,i915
drm_display_helper    331776  2 xe,i915
cec                   106496  3 drm_display_helper,xe,i915

dmesg starts the same as your output, the only difference is that I have GuC disabled.

dmesg | grep i915
[    1.609000] i915 0000:00:08.0: [drm] Found alderlake_s (device ID 4690) integrated display version 12.00 stepping C0
[    1.609986] i915 0000:00:08.0: [drm] VT-d active for gfx access
[    1.610073] i915 0000:00:08.0: [drm] Using Transparent Hugepages
[    1.611342] i915 0000:00:08.0: Invalid PCI ROM header signature: expecting 0xaa55, got 0x4556
[    1.611345] i915 0000:00:08.0: [drm] Failed to find VBIOS tables (VBT)
[    1.612136] i915 0000:00:08.0: vgaarb: VGA decodes changed: olddecodes=io+mem,decodes=none:owns=io+mem
[    1.614455] i915 0000:00:08.0: [drm] Finished loading DMC firmware i915/adls_dmc_ver2_01.bin (v2.1)
[    3.583673] i915 0000:00:08.0: [drm] [ENCODER:261:DDI A/PHY A] failed to retrieve link info, disabling eDP
[    3.605422] i915 0000:00:08.0: [drm] GT0: GuC firmware i915/tgl_guc_70.bin version 70.49.4
[    3.605426] i915 0000:00:08.0: [drm] GT0: HuC firmware i915/tgl_huc.bin version 7.9.3
[    3.615402] i915 0000:00:08.0: [drm] GT0: HuC: authenticated for all workloads
[    3.615410] i915 0000:00:08.0: [drm] GT0: GUC: submission disabled
[    3.615414] i915 0000:00:08.0: [drm] GT0: GUC: SLPC disabled
[    3.616508] i915 0000:00:08.0: [drm] Protected Xe Path (PXP) protected content support initialized
[    3.617330] i915 0000:00:08.0: [drm] Registered 4 planes with drm panic
[    3.617354] [drm] Initialized i915 1.6.0 for 0000:00:08.0 on minor 1
[    3.627390] i915 0000:00:08.0: [drm] Cannot find any crtc or sizes
[    3.637349] i915 0000:00:08.0: [drm] Cannot find any crtc or sizes
[    3.657358] i915 0000:00:08.0: [drm] Cannot find any crtc or sizes

Having edited /etc/modprobe.d/i915.conf by adding options i915 enable_guc=3 enable_huc=1 fixed the GuC part as well, however I still have the same issue. Cannot find any crtc or sizes is the only part which is not in your output.

/etc/default/grub is clean, I don't have NOMODESET:

cat /etc/default/grub
GRUB_TIMEOUT=5
GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"
GRUB_DEFAULT=saved
GRUB_DISABLE_SUBMENU=true
GRUB_TERMINAL_OUTPUT="console"
GRUB_CMDLINE_LINUX="rd.lvm.lv=fedora/root rhgb quiet"
GRUB_DISABLE_RECOVERY="true"

the_spice

I am in the same situation as @vhaelan.
same as in same iGPU (alderlake) passed-through, same output for those latest commands, same OS (Fedora CoreOS on latest Xcp-Ng stable).
Tried current avenues suggested in this thread with no progress.

It seems vhaelan has settled with CoreOS under Proxmox (which works!). He also mentioned it works in Debian under XCP-ng, though I haven't tested that myself.

I would appreciate additional suggestions for troubleshooting to take this further, in case anyone has any other ideas.