E3C252D4U-2T/OVH Intel iGPU (UHD P750) not exposed to OS, no /dev/dri/renderD128

[TransistorResultConsumer]

Hi all,

I'm running an E3C252D4U-2T (OVH variant) with a Xeon E-2374G (which has an Intel UHD Graphics P750 iGPU) on TrueNAS SCALE 25.04, kernel 6.12.15.

The iGPU is completely invisible to the OS

$ lspci | grep -i vga
04:00.0 VGA compatible controller: ASPEED Technology, Inc. ASPEED Graphics Family (rev 41)

$ lsmod | grep i915
(no output)

$ ls /dev/dri/
by-path  card0

No renderD128, i915 never loads.
This makes hardware transcoding via VAAPI/QSV impossible in Jellyfin.

In the BIOS (5.07), under Advanced -> Chipset Configuration, Primary Display only offers BMC VGA or PCIE — there is no IGFX or Auto option.

Onboard VGA is set to Enabled, but that only refers to the ASPEED BMC chip, not the CPU iGPU.

Has anyone managed to get the Intel iGPU working on this board?

Is there a BIOS setting or workaround I'm missing, or is this a known firmware limitation of the OVH variant?

 

[RolloZ170]

i think the OVH lacks VRM Rail for iGPU.
and for iGPU passthru you need chipset C256

 

[TransistorResultConsumer]

i think the OVH lacks VRM Rail for iGPU.
and for iGPU passthru you need chipset C256

Thanks @RolloZ170 that explains everything.

Honestly pretty frustrating to find out the OVH variant silently strips iGPU support with zero documentation from ASRock.
Would have been nice to know before buying. The official product page just lists "ASPEED AST2500" under Graphics and says nothing about the CPU iGPU being dead on arrival.

Guess I'll be looking at a low-profile dGPU or just living with software transcoding.

 

[RolloZ170]

Honestly pretty frustrating to find out the OVH variant silently strips iGPU support with zero documentation from ASRock.

that board is Custom for OEM, you should not have it. no support.

 

[RolloZ170]

The official product page

there is none for E3C252D4U-2T/OVH
only E3C252D4U-2T.

 

[RolloZ170]

ASRock Rack used the same PCB for
E3C252D4U-2T
E3C252D4U-2T /OVH
E3C256D4U-2L2T

 

[TransistorResultConsumer]

That's so frustrating

 

[etorix]

Certrainly frustrating, but it is reasonably well documented that you need a C2x6 chipset to do anything useful with the iGPU, not a C2x2.
Intel would not be Intel without artificial product segmentation.

 

[TransistorResultConsumer]

Certrainly frustrating, but it is reasonably well documented that you need a C2x6 chipset to do anything useful with the iGPU, not a C2x2.
Intel would not be Intel without artificial product segmentation.

I checked Intel's C252 vs C256 chipset comparison page both list "# of Displays Supported: 1" under GPU Specifications. There's nothing indicating the iGPU is unsupported or restricted on C252.
I also checked ASRock Rack's product page for the standard E3C252D4U-2T. Under Graphics it only lists the ASPEED AST2500, zero mention of the CPU iGPU being unavailable.

Where would I need to look instead?

 

[RolloZ170]

I checked Intel's C252 vs C256 chipset comparison page both list "# of Displays Supported: 1" under GPU Specifications. There's nothing indicating the iGPU is unsupported or restricted on C252.

iGPU Passthrough need C2x6, that's all you need to know.

I also checked ASRock Rack's product page for the standard E3C252D4U-2T. Under Graphics it only lists the ASPEED AST2500, zero mention of the CPU iGPU being unavailable.

this standard C252 motherboard has hdmi output from iGPU (but no iGPU passthrough support)
do you have hdmi on your OEM motherboard ?

 

[RolloZ170]

Where would I need to look instead?

ask the OEM who the board was made for before buying. think before buying why it is cheap.

 

[RolloZ170]

I'm running an E3C252D4U-2T (OVH variant) with a Xeon E-2374G (which has an Intel UHD Graphics P750 iGPU) on TrueNAS SCALE 25.04, kernel 6.12.15.

i found some interesting words in the BIOS setup strings.

To enabled CSM, please install an external graphics card which supports legacy mode

probably means iGPU need UEFI mode.
do you run TrueNAS in legacy or UEFI boot mode ?
BIOS 5.05

"System Agent (SA) Configuration" -> "Graphics Configuration" : "Intel IGFX", Help: "Keep IGFX enabled based on the setup options."

edit: even if you get iGPU enabled, you need to populate teh HDMI conn. to use it.