From bdd0f4e3333f6769aa740da38a67fa235062a62d Mon Sep 17 00:00:00 2001 From: Dave Carey Date: Tue, 28 Jul 2026 18:55:43 -0400 Subject: [PATCH] platform/x86/lenovo: lenovo-ymc: Suppress probe on Yoga Book 9 14IAH10 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The Yoga Book 9 14IAH10 (DMI product name "83KJ") has a dedicated yb9-kbdock WMI driver that registers an input device reporting SW_TABLET_MODE to track the detachable Bluetooth keyboard. lenovo-ymc also loads on this machine and creates an input node with the SW_TABLET_MODE capability bit set. For input switches, the presence of the capability bit has semantic meaning: userspace (e.g. GNOME) reads the switch state at startup from every node advertising the capability and does not expect more than one such node. Add a DMI match for the Yoga Book 9 14IAH10 to probe() so that lenovo-ymc returns -ENODEV on this hardware, leaving yb9-kbdock as the sole SW_TABLET_MODE source. The ymc_ec_trigger EC write, the only other action taken in response to a YMC event, is guarded by a separate DMI table that excludes this machine; no other functionality is affected. Signed-off-by: Dave Carey Reviewed-by: Hans de Goede Link: https://patch.msgid.link/20260728225545.1333610-2-carvsdriver@gmail.com Reviewed-by: Ilpo Järvinen Signed-off-by: Ilpo Järvinen --- drivers/platform/x86/lenovo/ymc.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/drivers/platform/x86/lenovo/ymc.c b/drivers/platform/x86/lenovo/ymc.c index 015e046b0fce..df96107d2501 100644 --- a/drivers/platform/x86/lenovo/ymc.c +++ b/drivers/platform/x86/lenovo/ymc.c @@ -28,6 +28,22 @@ static bool force; module_param(force, bool, 0444); MODULE_PARM_DESC(force, "Force loading on boards without a convertible DMI chassis-type"); +static const struct dmi_system_id lenovo_ymc_nosupport_dmi_table[] = { + { + /* + * Yoga Book 9 14IAH10: SW_TABLET_MODE is reported by the + * yb9-kbdock driver. Suppress lenovo-ymc on this machine to + * avoid userspace seeing two input nodes that both advertise + * the SW_TABLET_MODE capability. + */ + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), + DMI_MATCH(DMI_PRODUCT_NAME, "83KJ"), + }, + }, + { } +}; + static const struct dmi_system_id allowed_chasis_types_dmi_table[] = { { .matches = { @@ -107,6 +123,9 @@ static int lenovo_ymc_probe(struct wmi_device *wdev, const void *ctx) struct input_dev *input_dev; int err; + if (dmi_check_system(lenovo_ymc_nosupport_dmi_table)) + return -ENODEV; + if (!dmi_check_system(allowed_chasis_types_dmi_table)) { if (force) dev_info(&wdev->dev, "Force loading Lenovo YMC support\n");