Engineering Request: Remove "DISABLE_HWSCH" Flag & Enable ReBAR for Intel Arc 140T (Arrow Lake-H)

[TanushSatarawala]

Dear Intel Graphics Team / Executive Escalations, 

I am writing to formally request the prioritization of driver maturity and feature enablement for the ​Intel Arc 140T GPU (integrated in Core Ultra 7 255H "Arrow Lake-H" processors).

​The Issue: Despite the Arc 140T being a premium Xe-LPG+ component, its integration within Windows 11 is currently restricted by driver-level blocks that degrade performance. My diagnostics confirm that Hardware-Accelerated GPU Scheduling (HAGS) is being forcibly disabled by the driver, preventing the GPU from functioning as a native Windows 11 graphics device.

​Technical Evidence (Verified via attached DxDiag):

• ​Explicit Block List: My DxDiag report (Line 151) confirms the driver is flagging "Block List: DISABLE_HWSCH". This intentional software lock is forcing the OS to "DriverSupportState:AlwaysOff".
• Missing Resizable BAR Support: The current driver stack does not appear to correctly expose or utilize Resizable BAR (ReBAR) for this specific SKU. As the Arc architecture is heavily dependent on large memory page access for throughput, the lack of active ReBAR support creates a significant bottleneck in memory-intensive scenarios.
• ​Performance Impact: Because the scheduler cannot offload tasks to the GPU hardware, I am seeing significant under-utilization in Task Manager and anomalously low browser compositing scores of 28.0 ( tested via Speedometer 3.1) on Microsoft Edge. The CPU is being forced to handle window management tasks that the GPU is designed to accelerate.
• ​Driver Currency: I am already running the latest driver branch (v32.0.101.8425, dated Jan 16, 2026), indicating this is a persistent architectural omission, not an out-of-date software issue.

​System Configuration:

• ​Device: Motorola MotoBook 60 Pro (Model 83NY)
• ​Processor: Intel Core Ultra 7 255H
• ​GPU: Intel Arc 140T (16GB Shared Memory, 32 GB Total)
• ​OS: Windows 11 Home 64-bit (Build 26200)

​The Request: I urge the driver engineering team to remove the DISABLE_HWSCH flag and fully enable Resizable BAR support for the Xe-LPG+ architecture in the next maintenance release. The hardware is clearly capable, but the current software policy treats this premium chip as a legacy device, undermining the "Core Ultra" value proposition.

Please route this ticket to the Mobile Graphics Engineering team for review.

Best Regards,
Tanush​ Satarawala

[Mike_Intel]

Hello TanushSatarawala,

Thank you for posting in Intel community Forum.

For me to better understand and diagnose the issue further, let me ask you to provide detailed responses to the following questions. This information will help me isolate the problem and determine the most appropriate course of action moving forward.

1. Please help share more information that the performance is lacking.
2. Kindly share some screens captures of the performance and the issue.
3. What are the troubleshooting steps that you tried so far to improve the performance?
4. For me to review the hardware and the driver installed, please help generate the SSU logs of your system. Kindly refer to the link below for the steps:

How to get the Intel® System Support Utility Logs on Windows*

If you have questions, please let us know. Thank you.

Best regards,

Michael L.

Intel Customer Support Technician

[TanushSatarawala]

Hi Michael,

Please find the information related to the issue I'm facing

1. More information that the performance is lacking:

Occasional stuttering in daily use, the screen set at 120hz refresh rate, randomly won't refresh properly for 2-4 seconds at times.

Using a browser benchmark tool, "Speedometer 3.1" in Microsoft Edge (ver. 144.0.3719.115) I'm getting a score of 26.7, instead of the standard of 35-38 for my configuration as I've found online on forums. In contrast my previous system (NOV 2025) with a 4 core, AMD A10 processor with integrated graphics and 16GB DDR3 RAM from 2014, would post a score of 21.6

When playing a game (Tankionline) the system struggles to maintain an average of 60 fps on medium settings.

Display: 2880x1800 120 Hz panel
RAM: 32GB DDR5 5600MT/s (18GB shared with graphics)
Storage: SAMSUNG 1TB Gen4 NVME (ReBar not supported)
CPU: Intel Core Ultra 7 255H
GPU: Intel Arc 140T
Others: Well ventilated system, optimum airflow for cooling is present (not using on my lap)

2. Some screens captures of the performance and the issue can be found here: https://drive.google.com/drive/folders/1KOSNcFb4lbtx3j-0O7elp1weFvqQBXgX?usp=sharing

3. The troubleshooting steps that I've tried so far to improve the performance: Updated to the latest Intel Graphics Drivers & Intel Graphics Software. Furthermore, tweaked settings appropriately in the Intel Graphics Software, just the standard stuff.

4. For you to review the hardware and the driver installed, please find the generated SSU logs of my system here: https://drive.google.com/file/d/1hv5zcpstuTNSJ_Ow8MWDpHdxmb_9obQj/view?usp=sharing

Looking forward to hearing back from you.

Best regards,

Tanush Satarawala

[Mike_Intel]

Hello TanushSatarawala,

Thank you for the quick reply.

OEM manufacturers can edit/customize/modify controllers like Graphics controller. That is why there are 2 kinds of drivers, and they are Intel generic drivers that should work for most of the controllers out there. And the other one is the OEM driver provided by the manufacturer of the system. Most of the time, the recommended driver is OEM driver to apply the changes that the OEM manufacturers did in the system.

In this case, I suggest try to update the drivers using the OEM driver. You may update the BIOS if there is an updated version available.

Kindly try the support link of your laptop below:

moto book 60 PRO - Drivers| Motorola Support IN

If you have questions, please let us know. Thank you.

Best regards,

Michael L.

Intel Customer Support Technician

[TanushSatarawala]

Hi Michael,

Thank you for following up and for the suggestions. I have double-checked my system, and I can confirm that my BIOS and all system software are already completely up to date. Additionally, all system drivers were already installed directly from the official Motorola support page you linked, with the exception of the Intel Graphics and Intel Audio drivers (which I updated separately to ensure I had the latest releases).

However, the core issue I reported in my initial post remains unresolved. The Hardware-Accelerated GPU Scheduling (HAGS) feature is simply not available in Windows for this specific GPU. Because of this, the GPU is being flagged as "unsupported" by key applications, most notably my primary browser, Microsoft Edge.

Could you please look further into this specific restriction (the DISABLE_HWSCH flag) and provide a resolution, or escalate this to the engineering team for review? I look forward to hearing back from you.

Best regards,

Tanush Satarawala

[Mike_Intel]

Hello TanushSatarawala,

Thank you for the quick reply.

Have you tried the Audio and Graphics driver from Motorola?

Just like what I have explained in my previous message, laptop manufacturers can modify Graphics controllers and enable those modifications, they release their own drivers. That is why it is recommended to use OEM drivers most of the time.

If you have questions, please let us know. Thank you.

Best regards,

Michael L.

Intel Customer Support Technician

[Mike_Intel]

Hello TanushSatarawala,

I hope this message finds you well. 

Were you able to check the previous post?

Please let us know if you still need assistance.

Best regards,

Michael L.

Intel Customer Support Technician

[Mike_Intel]

Hello TanushSatarawala,

I hope you are having a good day.

I am sending another follow up and hoping that you already tried to contact the OEM for further assistance. 

Since we have not heard back from you, I need to close this inquiry. 

If you need further assistance, please post a new question as this thread will no longer be monitored. 

Thank you and have a great day.

Best regards,

Michael L.

Intel Customer Support Technician