[PATCH v13 1/2] platform/x86/lenovo: lenovo-ymc: Suppress probe on Yoga Book 9 14IAH10
From: Dave Carey <hidden>
Date: 2026-07-22 14:27:21
Also in:
lkml, platform-driver-x86
Subsystem:
lenovo drivers, the rest, x86 platform drivers · Maintainers:
Mark Pearson, Derek J. Clark, Linus Torvalds, Hans de Goede, Ilpo Järvinen
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 <redacted> --- 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 470d53e3c9d29..a13c89dcb285a 100644
--- a/drivers/platform/x86/lenovo/ymc.c
+++ b/drivers/platform/x86/lenovo/ymc.c@@ -24,6 +24,22 @@ 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 = {
@@ -101,6 +117,9 @@ 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");
--
2.55.0