FAQ
TL;DR: 6 device IDs mapped to drivers; "They download as EXEs by default." Fix T420 Win7 x64 by installing the Lenovo/Intel packages below. For graphics and ACPI LEN0068, use the specific links provided. [Elektroda, dt1, post #17748371]
Why it matters: Clear steps for Windows 7 x64 ThinkPad T420 owners whose Lenovo downloads don’t install or don’t appear to work.
Quick Facts
- Official Lenovo T420 driver downloads for Windows 7 x64 are available on Lenovo Support. [Elektroda, Pedros050, post #17748354]
- Microsoft Update Catalog packages often come as .cab files; extract and install via Device Manager. [Elektroda, Kolobos, post #17748367]
- ACPI LEN0068 is fixed by installing Lenovo package n1zku17w_x64.exe. [Elektroda, dt1, post #17748448]
- Use Intel graphics driver win64_152824 (v15.28.24) for T420 integrated graphics on Win7 x64. [Elektroda, dt1, post #17748448]
- Intel LAN controller VEN_8086 DEV_1502 uses Lenovo package 83rw20ww_64.exe. [Elektroda, dt1, post #17748371]
Which Lenovo T420 drivers match these PCI IDs on Windows 7 64‑bit?
Install 83ra31ww.exe for DEV_1C3D and DEV_1C3A. Use 8ass82ww.exe for VEN_1180 DEV_E823. Use n1au414w.exe for ACPI LEN0068. Install 8aw217ww.exe or Intel 19.70.0 for VEN_8086 DEV_0085. Use chipset 10.1.17 for DEV_1C22. Install 83rw20ww_64.exe for VEN_8086 DEV_1502. [Elektroda, dt1, post #17748371]
Should I check Windows Update after installing the LAN driver?
Yes. “After installing, check on WU if there are others.” If Windows Update finds nothing, search the exact PCI ID in Google and download a matching package. This approach quickly resolves the remaining devices once networking works. [Elektroda, Kolobos, post #17748334]
How do I install a .cab driver from Microsoft Update Catalog?
“Download, unpack, install from the device manager.”
- Download the .cab and extract it to a folder.
- Open Device Manager > right‑click the device > Update driver.
- Choose Browse my computer and point to the extracted folder.
This installs unsigned .cab contents cleanly. [Elektroda, Kolobos, post #17748367]
Why do Lenovo installers run but drivers still don’t show up?
Recent Lenovo packages download as EXEs that unpack and auto‑install. Ensure the installer completes and the install option remains checked. Older packages only unpacked, so nothing changed until you installed manually. Re‑run the current EXE build to trigger installation. [Elektroda, dt1, post #17748371]
What driver fixes ACPI LEN0068 on a T420?
Install Lenovo’s n1zku17w_x64.exe to resolve the ACPI LEN0068 device. This package targets the power management interface that shows as an unknown device. Reboot after installation to finalize. [Elektroda, dt1, post #17748448]
Which driver do I need for Intel LAN controller VEN_8086 DEV_1502?
Use Lenovo’s 83rw20ww_64.exe package. It matches the 8086:1502 adapter used in the T420 and installs cleanly on Windows 7 x64. If needed, install via Device Manager after running the EXE. [Elektroda, dt1, post #17748371]
What package covers Intel system devices DEV_1C3D and DEV_1C3A?
Install Lenovo package 83ra31ww.exe. It handles the Intel system interface devices flagged by those hardware IDs on the T420. Reboot once completed to clear the warnings. [Elektroda, dt1, post #17748371]
Where do I get the Ricoh card reader driver (VEN_1180 DEV_E823)?
Use Lenovo package 8ass82ww.exe for the Ricoh reader. This driver restores SD card functionality and removes the unknown device flag in Device Manager. [Elektroda, dt1, post #17748371]
Wi‑Fi (VEN_8086 DEV_0085) not working—what should I install?
Install Lenovo’s 8aw217ww.exe, or use Intel’s WiFi_Win7_64_19.70.0.exe. Both target the 8086:0085 adapter. Reboot and reconnect to confirm wireless functionality. [Elektroda, dt1, post #17748371]
Intel HD Graphics feels slow—how do I fix it on Windows 7 x64?
Install Intel graphics driver win64_152824.exe. It’s the recommended package for the T420’s integrated graphics under Windows 7 x64. Update, reboot, and verify acceleration is enabled. [Elektroda, dt1, post #17748448]
Where can I download all T420 drivers in one place?
Use Lenovo’s official ThinkPad T420 driver page. Choose Windows 7 64‑bit, then download listed packages. This centralizes chipset, LAN, Wi‑Fi, and system utilities. [Elektroda, Pedros050, post #17748354]
What unknown device IDs are typical after a fresh Windows 7 install?
One user reported seven unknown devices: 8086:1502, 8086:1C22, 8086:1C3A, 8086:0085, ACPI\LEN0068, 1180:E823, and 8086:1C3D. Use these IDs to match exact drivers. This speeds resolution and avoids mismatched packages. [Elektroda, kisiol, post #17748298]
How do I enable touchpad gestures and ThinkPad hotkeys?
Install UltraNav 6hgx81ww.exe for touchpad features and scrolling. Then install Hotkeys 8jvu43ww.exe for on‑screen display and Fn‑key functions. Reboot between installs for reliability. [Elektroda, dt1, post #17748479]
If Lenovo’s driver “doesn’t approach,” what should I do next?
Match your PCI ID to the specific package and install that driver. The mapped links cover LAN, Wi‑Fi, chipset, card reader, and ACPI devices. Lenovo EXEs unpack and auto‑install when run. [Elektroda, dt1, post #17748371]
