kernel/git/stable/linux.git/Documentation/admin-guide/laptops, branch master

platform/x86: thinkpad_acpi: Add USB-C Security (USCS) support

2026-07-09T13:43:47+00:00

Newer ThinkPad systems expose a USB-C Security (Restricted Mode) feature. When active, USB-C data connections are disabled while power delivery is preserved. This is useful for kiosk and physically-secured deployments. Hardware interface: The HKEY device exposes a read-only ACPI method USCS(): Return value bit layout: Bit 16 : Capability flag (1 = feature present on this SKU) Bit 0 : Current state (0 = security OFF, 1 = security ON) The sysfs attribute is read-only. The Fn+U followed by Fn+S hotkey chord is the only way to toggle the hardware state. Hotkey: Fn+U followed by Fn+S generates HKEY event 0x131e. sysfs interface: /sys/devices/platform/thinkpad_acpi/usb_c_security (read-only) "enabled\n" -- data connections are currently blocked "disabled\n" -- data connections are currently allowed The attribute is hidden on SKUs where the USCS capability bit (bit 16) is not set, so there is no ABI impact on unsupported hardware. Suggested-by: Mark Pearson Signed-off-by: Vishnu Sankar Link: https://patch.msgid.link/20260709021504.465792-1-vishnuocv@gmail.com Reviewed-by: Ilpo Järvinen Signed-off-by: Ilpo Järvinen

platform/x86: uniwill-laptop: Add support for USB powershare

2026-07-06T08:27:06+00:00

Some devices support a "USB powershare" feature where the system will continue to provide power via the USB ports when hibernating or powered off. Add support for this feaure. Signed-off-by: Armin Wolf Link: https://patch.msgid.link/20260530170813.10166-5-W_Armin@gmx.de Reviewed-by: Ilpo Järvinen Signed-off-by: Ilpo Järvinen

platform/x86: uniwill-laptop: Add AC auto boot support

2026-07-06T08:27:04+00:00

Some devices support a "AC auto boot" feature where the system will automatically boot when being connected to a power source. Add support for this feature. Signed-off-by: Armin Wolf Link: https://patch.msgid.link/20260530170813.10166-4-W_Armin@gmx.de Reviewed-by: Ilpo Järvinen Signed-off-by: Ilpo Järvinen

platform/x86: uniwill-laptop: Add keyboard backlight support

2026-07-06T08:27:01+00:00

Many Uniwill-based devices support either a white-only or fully features RGB keyboard backlight. Add support for this feature and handle the associated WMI events. Signed-off-by: Armin Wolf Link: https://patch.msgid.link/20260530170813.10166-2-W_Armin@gmx.de Reviewed-by: Ilpo Järvinen Signed-off-by: Ilpo Järvinen

Merge tag 'platform-drivers-x86-v7.2-1' of git://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86

2026-06-23T15:31:33+00:00

Pull x86 platform driver updates from Ilpo Järvinen: - amd/hfi: Add support for dynamic ranking tables (version 3) - amd/pmc: - Add PMC driver support for AMD 1Ah M80H SoC - Delay suspend for some Lenovo Laptops to avoid keyboard and lid switch problems after s2idle - arm64: qcom-hamoa-ec: Add Hamoa/Purwa/Glymur EC driver - asus-armoury: add support for G614PR, GA402NJ, GA403UM, and FX608JPR - asus-wmi: add keystone dongle support - dell-dw5826e: Add reset driver for DW5826e - dell-laptop: Fix rollback path - hp-wmi: - Add support for Omen 16-ap0xxx (board ID 8D26) and board ID 8B2F - intel-hid: - Add HP ProBook x360 440 G1 5 button array support - Prevent racing ACPI notify handlers - intel/pmc: - Add Nova Lake support - Rate-limit LTR scale-factor warning - intel-uncore-freq: - Expose instance ID in the sysfs - Fix current_freq_khz after CPU hotplug - intel/vsec: Restore BAR fallback for header walk - ISST: Restore SST-PP control to all domains - lenovo-wmi-*: - Add more CPU tunable attributes - Add GPU tunable attributes - Add WMI battery charge limiting - oxpec: add support for OneXPlayer Super X - sel3350-platform: Retain LED state on load and unload - surface: SAM: Add support for Surface Pro 12in - uniwill-laptop: Add support for battery charge modes - tools/power/x86/intel-speed-select: Harden daemon pidfile open - Major refactoring efforts: - ACPI driver to platform driver conversion - Converting drivers to use the improved WMI API - Miscellaneous cleanups / refactoring / improvements * tag 'platform-drivers-x86-v7.2-1' of git://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86: (115 commits) platform/x86/intel/pmc: Add NVL PCI IDs for SSRAM telemetry discovery platform/x86/intel/pmc/ssram: Make PMT registration optional platform/x86/intel/pmc/ssram: Add ACPI discovery scaffolding platform/x86/intel/pmc/ssram: Switch to static array with per-index probe state platform/x86/intel/pmc/ssram: Refactor DEVID/PWRMBASE extraction into helper platform/x86/intel/pmc/ssram: Add PCI platform data platform/x86/intel/pmc/ssram: Rename probe and PCI ID table for consistency platform/x86/intel/pmc: Add ACPI PWRM telemetry driver for Nova Lake S platform/x86/intel/pmc: Add PMC SSRAM Kconfig description platform/x86/intel/pmt: Unify header fetch and add ACPI source platform/x86/intel/pmt: Cache the telemetry discovery header platform/x86/intel/pmt: Pass discovery index instead of resource platform/x86/intel/pmt/telemetry: Move overlap check to post-decode hook platform/x86/intel/pmt/crashlog: Split init into pre-decode platform/x86/intel/pmt: Add pre/post decode hooks around header parsing modpost: Handle malformed WMI GUID strings platform/wmi: Make sysfs attributes const platform/wmi: Make wmi_bus_class const hwmon: (dell-smm) Use new buffer-based WMI API platform/x86: dell-ddv: Use new buffer-based WMI API ...

Merge tag 'docs-7.2' of git://git.kernel.org/pub/scm/linux/kernel/git/docs/linux

2026-06-16T03:05:59+00:00

Pull documentation updates from Jonathan Corbet: "Things have calmed down a bit on the docs front, with no earthshaking changes this time around: - Ongoing work on the Japanese and Portuguese translations - Better integration of the MAINTAINERS file into the rendered documents, including a search interface - A seemingly infinite supply of fixes for typos, minor grammatical issues, and related problems that LLMs find with abandon" * tag 'docs-7.2' of git://git.kernel.org/pub/scm/linux/kernel/git/docs/linux: (93 commits) docs: pt_BR: Translate 3.Early-stage.rst into Portuguese docs: pt_BR: update "Purpose of Defconfigs" section in maintainer-soc.rst Documentation: bug-hunting.rst: fix grammar docs/ja_JP: translate submitting-patches.rst (interleaved-replies) docs: Fix minor grammatical error docs/{it_it,sp_SP,zh_CN,zh_TW}: update references to removed CONFIG_DEBUG_SLAB Documentation: process: fix brackets Documentation: arch: fix brackets docs/dyndbg: explain flags parse 1st docs/dyndbg: update examples \012 to \n docs: kernel-parameters: Fix stale sticore file paths docs: real-time: Fix duplicated sched(7) text docs: kgdb: Fix stale source file paths docs: sonypi: Fix stale header file path docs: kernel-parameters: Remove sa1100ir IrDA parameter iommu: Documentation: rearrange, update kernel-parameters docs: md: fix grammar in speed_limit description docs: changes.rst: restore pahole 1.26 minimum (regressed by sort) Documentation: Fix syntax of kmalloc_objs example in coding style doc docs: pt_BR: update maintainer-handbooks ...

docs: sonypi: Fix stale header file path

2026-06-01T19:02:20+00:00

The sonypi.h header was moved from drivers/char/ to include/linux/. Update the reference. Assisted-by: Claude:claude-opus-4-6 Signed-off-by: Costa Shulyupin Signed-off-by: Jonathan Corbet Message-ID: <20260531135850.4113774-1-costa.shul@redhat.com>

platform/x86: uniwill-laptop: Add support for battery charge modes

2026-05-28T10:23:33+00:00

Many Uniwill-based devices do not supports the already existing charge limit functionality, but instead support an alternative interface for controlling the battery charge algorithm. Add support for this interface and update the documentation. Reviewed-by: Werner Sembach Reviewed-by: Ilpo Järvinen Signed-off-by: Armin Wolf Link: https://patch.msgid.link/20260512232145.329260-8-W_Armin@gmx.de Signed-off-by: Ilpo Järvinen

platform/x86: uniwill-laptop: Do not enable the charging limit even when forced

2026-05-19T13:52:49+00:00

It seems that on some older models (~2020) the battery charging limit can permanently damage the battery. Prevent users from enabling this feature thru the "force" module parameter to avoid causing permanent hardware damage on such devices. Fixes: d050479693bb ("platform/x86: Add Uniwill laptop driver") Link: https://www.reddit.com/r/XMG_gg/comments/ld9yyf/battery_limit_hidden_function_discovered_on/ Reviewed-by: Werner Sembach Reviewed-by: Ilpo Järvinen Signed-off-by: Armin Wolf Link: https://patch.msgid.link/20260512232145.329260-5-W_Armin@gmx.de Signed-off-by: Ilpo Järvinen

Documentation: laptops: Update documentation for uniwill laptops

2026-03-31T14:27:32+00:00

Adds short description for two new sysfs entries, ctgp_offset and usb_c_power_priority, to the documentation of uniwill laptops. Reviewed-by: Armin Wolf Reviewed-by: Shuah Khan Signed-off-by: Werner Sembach Link: https://patch.msgid.link/20260324203413.454361-6-wse@tuxedocomputers.com Reviewed-by: Ilpo Järvinen Signed-off-by: Ilpo Järvinen