Unselectable for kernel dma protection lenovo It is not recommended to disable secure boot unless instructed to by a support professional. Press the F1 key when the Lenovo logo is displayed to enter the ThinkPad setup. Technische Tipps für das Betriebssystem melden möglicherweise, dass der Boot-DMA-Schutz beim Konfigurieren von Secured-Core-Funktionen nicht unterstützt wird - Lenovo ThinkSystem SR630 V2 und SR650 V2 Welcome to Lenovo and Motorola community. Related Articles Popular Topics: Tips for PC's Kernal DMA Protection is switched on by default for security. Jun 22, 2020 · ThinkPad 490的bios界面如下： 1. Kernel DMA Protection requires UEFI firmware support, and Virtualization-based Security (VBS) isn’t required. Aug 25, 2021 · 相信很多使用联想ThinkPad电脑的用户都遇到过关闭SecureBoot后还是无法对引导模式进行更改，其实很有可能是因为bios设置里的“Kernel DMA Protection”的选项所导致的，只要将其关闭即可，那要如何关闭呢？下面就给大家带来Acer笔记本关闭uefi模式的操作方法吧！ Mar 31, 2022 · Kernel DMA Protection is the feature designed to protect the system against this type of attack. 하지만 산넘어산 Unselectable for Secure Boot 메세지가 뜬다 이건 Security에 Secure Boot 에 들어가면 Secure Boot 비활성화 常见原因：BIOS下开启了安全启动；硬盘模式非AHCI；DMA保护开启。 ThinkPad 2020 部分新品已经取消了修改引导方式的功能，请注意。 重要提示： 1. " Applicable Systems The system may be any of the following Lenovo servers: ThinkSystem SR630 V2, Type 7Z70/7Z71, any model ThinkSystem SR650 V2, Type 7Z72/7Z73, any model Solution Make sure the following UEFI settings are Don't want to provide serial number? you can also Browse by product Welcome to Lenovo and Motorola community. (VT-d settings can be found under Advanced CPU Settings) Save And Exit and then reboot your MXI PC. via Windows Admin Center), the OS may report Boot DMA Protection not supported or it is not displayed as "ON. You'd have to find some way to disable DMA and Kernel DMA protection in BIOS settings about VT-d, AMD-Vi, IOMMU, Device Guard, Kernel DMA Protection, ThunderBolt Security Level etc. He said to leave Intel Virtualization Tech and VT-d enabled, even though I've read other people suggesting to disable VT-d. Intel VT-d Intel VT-d, formally called as Intel VT for Directed I/O, consists of the following three features: DMA Nov 26, 2024 · Kernel DMA Protection Kernel Direct Memory Access (DMA) Protection is a security feature in Windows designed to prevent unauthorized access to memory by external peripherals. These devices are DMA-capable, and Aug 22, 2019 · 2 I had same Problem on my Lenovo t490. 症状 一部のユーザーの間で、BIOSでブートモードボタンがグレイアウトして、変更できない現象が報告されています。 図のように、BIOSにはハードディスクモードの設定がありません。 Secure Boot 設定がオフになっています。 対象機種 ThinkPad T490 対策 この問題は、BIOSで「Kernel DMA Protection」が有効 In this article, you will find solutions for a grey boot mode button. Kernel DMA Protection is a platform feature that can't be controlled via policy or by end user. Also please understand that this is an open source project and not many Nov 20, 2019 · 解决：重启电脑（不能使用关机），显示LENOVO图标后按Enter键，进入选择界面（F1-BIOS,F12-启动项选择界面）问题：有对应的选项为灰色，并在右下角显示以下提示：unselectable for kernel DMA Protection解决：BIOS中Security_unselectable for secure boot Jul 12, 2025 · The option to enable it was greyed out (under the section "Start"). The hope is that this article helps you gain a basic understanding of it and start looking into more details as you are interested. 不同机型BIOS界面不一样，请先确认好BIOS界面，再操作。部分被取消修改引导方式的机器默认UEFI引导，不支持修改，请注意。 2. 关闭安全启动：Secury boot—选择Disabled，截图如下： 2. If the website doesn't work properly without JavaScript enabled. It has to be supported by the system at the time of manufacturing. May 12, 2023 · I accidentally disabled kernel DMA protection. 关闭 kernel DMA protection（内核隔离）选项。 （此选项多见于ThinkPad机器） security-virtualization-kernel DMA protection-disabled。 Welcome to Lenovo and Motorola community. Oct 18, 2023 · 参考界面二、Config--Storage—Controller Mode—AHCI。 参考界面三、Config--RAID--Disabled。 3. Find Virtualization under Security in the BIOS. English Community-Lenovo Community After that, if you haven’t done so already add a strong supervisor password that you can’t forget and turn on chassis intrusion detection. Apr 29, 2021 · 近日收到部分工程师称ThinkPad关闭SecureBoot后仍无法对引导模式进行更改的问题，经过工程师上传过来的照片和对实物笔记本的分析，目前已经确认为BIOS内的“Kernel DMA Protection”选项开启导致。 为您提供联想Thinkpad笔记本的常见问题原因分析、解决方案和操作指导。 Sep 28, 2025 · What is Kernel DMA protection? How to disable Kernel DMA protection on Windows 11? This post provides all the answers for you. May 14, 2023 · I'm really sorry, but I don't have a Lenovo Legion 5 pro system to test against. PCIe hot plug devices such as Thunderbolt, USB4, and CFexpress allow users to attach classes of external peripherals, including graphics cards, to their devices with the plug-and-play ease of USB. This policy only takes effect when Kernel DMA Protection is supported and enabled by the system firmware. Go to the Config page and enter Thunderbolt (TM) 3. Find Virtualization Nov 6, 2024 · Choose the Kernel DMA Protection and then select Disabled. If you really need thunderbolt, turn on Kernel DMA Protection, chassis intrusion detection and set a nice supervisor pass. I can access the bios even if it asks me for a password by just pressing enter, some of the settings are unlocked and some are locked and greyed out, including all security settings and kernel dma protection (what I'm interested in disabling). 关闭 kernel DMA protection（内核隔离）选项。 （此选项多见于ThinkPad机器） 截图如下： 然后将UEFI/LEGACY boot改为 both 均可支持，截图如下： Dec 4, 2024 · Kernel Direct Memory Access (DMA) Protection is a security feature in Windows designed to prevent unauthorized access to memory by external peripherals. ACPI: DSDT 0x0000000000000000 0222DD (v02 LENOVO SKL 00000000 INTL 20160527) ACPI: XSDT 0x0000000000000000 000134 (v01 LENOVO TP-N24 00001230 PTEC 00000002) Symptom When configuring secured-core features on the OS (e. Will also try Disabling DMA protection in he BIOS. Any tips or Welcome to Lenovo and Motorola community. Microsoft learn suggests disabling Kernel DMA Protection at BIOS level as a work-around to this BSOD error, but I am having trouble finding this setting in Dell BIOS (vers. May 30, 2023 · In my Uefi menu i dont see anywhere to turn off the Kernal DMA protection on my windows 11 PC. DMA 수정은 Security 에 Virtualization 에서 DMA 비활성화 해주면 된다. The Secure Boot (recommended) option provides secure boot with as much protection as is supported by a given computer’s hardware. Similar to what I mentioned before. Find Virtualization Just bought a new X1 Carbon Gen7, and it won't let me configure the Thunderbolt in BIOS (such as changing the security level). I got a used t490 recently and have lots of troubles removing the supervisor's password. Solution This problem is due to the activated Kernel DMA Protection in BIOS. Dec 13, 2024 · Follow the instructions to Enable or Disable secure boot in BIOS. What should I do to get it back up? Jun 23, 2020 · 6 To Enable Device Guard A) Select (dot) Enabled. Welcome to Lenovo and Motorola community. - Disable Kernel DMA Protection - Change UEFI boot mode to Both option and Legacy The Windows update completed without any force reboot or power off. Can you please advise on how this can be done? Thank you. Related Articles Was this information helpful? Aug 9, 2010 · 第二种情况：bios中开启了DMA保护，需要在bios中关闭安全启动才能修改引导模式。 解决办法二：关闭DMA方法： 关闭 kernel DMA protection（内核隔离）选项。 Boot into BIOS and go to Security:Virtualization and disable Kernel DMA Protection. and in OS settings. Windows makes use of the system Input/Output Memory Management Unit (IOMMU) to block external peripherals from starting and performing DMA unless the drivers for these peripherals support memory isolation, such as DMA-remapping. This article shows you how to boot to Legacy device or system configured with Microsoft Windows 10. Mar 24, 2025 · 参考界面二：联想笔记本关闭安全启动 (2020款以前笔记本) 第二种情况：bios中开启了DMA保护，需要在bios中关闭安全启动才能修改引导模式。 解决办法二：关闭DMA方法：关闭 kernel DMA protection (内核隔离)选项。 (此选项多见于ThinkPad机器) We would like to show you a description here but the site won’t allow us. Turn on Intel Virtualization Technology for I/O (VT-d). Apr 29, 2021 · 近日收到部分工程师称ThinkPad关闭SecureBoot后仍无法对引导模式进行更改的问题，经过工程师上传过来的照片和对实物笔记本的分析，目前已经确认为BIOS内的“Kernel DMA Protection”选项开启导致。 Welcome to Lenovo and Motorola community. Now I'm able to switch legacy mode on. Sep 17, 2025 · This BIOS is on some newer or updated BIOS version from OEM manufacturers OEM manufacturers such as Dell, Lenovo, and HP are starting to add DMA protection to the BIOS to prevent unintended Direct Memory Attacks for all DMA-capable devices during the boot process. Who would have predicted that it is under the "Virtualization" section? This policy only takes effect when Kernel DMA Protection is supported and enabled by the system firmware. For information on accessing the BIOS, see Recommended ways to enter BIOS - ThinkPad, ThinkCentre, ThinkStation. Symptom Some users have encountered the problem where the boot mode button is gray and cannot be changed in BIOS. (see screenshot below step 7) B) Under Options, select Secure Boot or Secure Boot and DMA Protection in the Select Platform Security Level drop menu for what you want. Conveniently, I had to start hunting for that option. Find Virtualization Welcome to Lenovo and Motorola community. Solution This problem is due to the activated Kernel DMA Protection in BIOS. The BIOS told me that Legacy support is "Unselectable for Kernel DMA Protection". Press Enter to access Security and then turn off DMA Protection. Please enable it to continue. Aug 9, 2010 · 参考界面二：联想笔记本关闭安全启动 (2020款以前笔记本) 第二种情况：bios中开启了DMA保护，需要在bios中关闭安全启动才能修改引导模式。 解决办法二：关闭DMA方法： 关闭 kernel DMA protection（内核隔离）选项。 （此选项多见于ThinkPad机器） Trawled Lenovo and can only find the Ethernet driver that was released along with the SCCM driver package on 18/03, no sign of the updated driver from 28/04. In case users do not want to use the Kernel DMA Protection feature, use the following information for ThinkPad models released 2017 and 2018. Turning it off will allow you to change to Legacy Mode but the laptop will be open to external attack. 1. 22. Oct 14, 2021 · Troubleshoot Done so far I found this MS page, that says If the current state of Kernel DMA Protection is OFF and Hyper-V - Virtualization Enabled in Firmware is NO: Reboot into BIOS settings Turn on Intel Virtualization Technology. Any T490 user out here is having the same issue? Mar 6, 2025 · What is Kernel DMA Protection? Kernel DMA Protection is a security mechanism implemented in Windows that prevents attackers from exploiting certain vulnerabilities related to Direct Memory Access (DMA) attacks. Another thing that you can set to Disabled in the BIOS is the Intel Virtualization Technology for I/O (VT- d) if you don't have the option to disable Kernel DMA Protection. 0, 3/21/2023). Besides system updates, Windows updates and driver updates (have done all these), is there any way to troubleshoot this issue? All Lenovo's tech support can recommend is getting a replacement machine, but the replacement they sent has the exact same issue. In Windows 10 version 1803, only Intel VT-d is supported. I just went under the tab Security and the Virtualization, there was the option Kernel DMA Protection, and I switched it off. Oct 13, 2022 · Lenovo 노트북에 UEFI / Legacy 모드로 부팅을 변경 하려 하니 Unselectable for Kernel DMA Protection 라는 메세지가 뜨면서 수정이 안된다. DMA allows peripherals, such as graphics cards and network interfaces, to access system memory directly, bypassing the CPU. I don't think it is a hardware issue as the loop issue on occurs after Windows update restart the ThinkPad after update has completed. Kernel DMA Protection Whether to enable Kernel DMA protection, to prevent drive-by Direct Memory Access (DMA) attacks using PCI hot plug devices connected to system. Aug 15, 2025 · Kernel Direct Memory Access (DMA) Protection is a Windows security feature that protects against external peripherals from gaining unauthorized access to memory. BIOS下的改动可能会导致原 May 18, 2020 · This post is a write up of the introductory study of Intel VT-d, especially about how DMA remapping may be programmed and how Windows uses it. Does anyone know how to disable kernel dma protection? Having issues to disable it on my new legion tower 7i gen 8 Welcome to Lenovo and Motorola community. It won’t fully protect you, but it should help a lot. ThinkPad models released 2017 and 2018 Reboot the system. truer/techsupport Current search is within r/techsupport Remove r/techsupport filter and expand search to all of Reddit Aug 18, 2020 · 但是设置这个时会出现 ：“ unselectable for kernel DMA Protection ” 解决：BIOS中Security - Virtualization - kernel DMA Protection - off 2、关闭安全启动（Disable Security Boot） 3、关闭Fast Boot，这个Fast Boot是为了加速 windows 启动的，不利于ubuntu的引导 然后就可以用u盘安装ubuntu了 参考 This program is suitable for disabling Kernel DMA Protection on windows 10 or windows 11 even when target firmware has Secure Boot, VT-d, VT-x, Sure Start, Virtualization based BIOS Security, and Enhanced Firmware runtime Intrusion and Detection Enabled. g. There is no hard disk mode setting in BIOS and the secure boot setting is turned off, as shown in the following picture: Applicable Brands ThinkPad Applicable Systems ThinkPad T490 Solution This problem is due to the activated Kernel DMA Protection in BIOS. We would like to show you a description here but the site won’t allow us. cgrfyq johot oiubbc ugtsa voybylf edgy awbtfq ubsy iffm zxcvfhg gxeaf xlgox dzxl aptb mliik