[v1] Input: synaptics - add LEN2058 to SMBus passlist for ThinkPad E490

[PATCH] Input: synaptics - add LEN2058 to SMBus passlist for ThinkPad E490

Posted by contacto@bazaes.cl 1 month ago

From: Nicolás Bazaes <contacto@bazaes.cl>

The Lenovo ThinkPad E490 (PNP ID: LEN2058) has a Synaptics TM3471-020
touchpad that supports SMBus/RMI4 mode but is not listed in
smbus_pnp_ids[]. Without this entry, psmouse ignores the
synaptics_intertouch parameter and falls back to PS/2 mode even when
explicitly requested.

Adding LEN2058 to the passlist enables RMI4 over SMBus, which provides
better multitouch support and matches the behavior of similar ThinkPad
models already in the list (E480/LEN2054, E580/LEN2055).

Tested on ThinkPad E490 with kernel 7.0.5-zen1 and Arch Linux.

Signed-off-by: Nicolás Bazaes <contacto@bazaes.cl>
Assisted-by: Claude <claude.ai>
---
 drivers/input/mouse/synaptics.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/input/mouse/synaptics.c b/drivers/input/mouse/synaptics.c
index 26071128f..c70502e24 100644
--- a/drivers/input/mouse/synaptics.c
+++ b/drivers/input/mouse/synaptics.c
@@ -190,6 +190,7 @@ static const char * const smbus_pnp_ids[] = {
 	"LEN2044", /* L470  */
 	"LEN2054", /* E480 */
 	"LEN2055", /* E580 */
+	"LEN2058", /* E490 */
 	"LEN2068", /* T14 Gen 1 */
 	"SYN1221", /* TUXEDO InfinityBook Pro 14 v5 */
 	"SYN3003", /* HP EliteBook 850 G1 */
-- 
2.54.0

Re: [PATCH] Input: synaptics - add LEN2058 to SMBus passlist for ThinkPad E490

Posted by Dmitry Torokhov 4 weeks, 1 day ago

On Wed, May 13, 2026 at 12:57:44AM -0400, contacto@bazaes.cl wrote:
> From: Nicolás Bazaes <contacto@bazaes.cl>
> 
> The Lenovo ThinkPad E490 (PNP ID: LEN2058) has a Synaptics TM3471-020
> touchpad that supports SMBus/RMI4 mode but is not listed in
> smbus_pnp_ids[]. Without this entry, psmouse ignores the
> synaptics_intertouch parameter and falls back to PS/2 mode even when
> explicitly requested.
> 
> Adding LEN2058 to the passlist enables RMI4 over SMBus, which provides
> better multitouch support and matches the behavior of similar ThinkPad
> models already in the list (E480/LEN2054, E580/LEN2055).
> 
> Tested on ThinkPad E490 with kernel 7.0.5-zen1 and Arch Linux.
> 
> Signed-off-by: Nicolás Bazaes <contacto@bazaes.cl>
> Assisted-by: Claude <claude.ai>

Thank you for the patch. From checkpatch.pl:

WARNING: Assisted-by expects 'AGENT_NAME:MODEL_VERSION [TOOL1] [TOOL2]' format

Thanks.

-- 
Dmitry

[PATCH v2] Input: synaptics - add LEN2058 to SMBus passlist for ThinkPad E490

Posted by contacto@bazaes.cl 4 weeks, 1 day ago

From: Nicolás Bazaes <contacto@bazaes.cl>

The Lenovo ThinkPad E490 (PNP ID: LEN2058) has a Synaptics TM3471-020
touchpad that supports SMBus/RMI4 mode but is not listed in
smbus_pnp_ids[]. Without this entry, RMI4 over SMBus is not enabled
by default, and the touchpad falls back to PS/2 mode.

Adding LEN2058 to the passlist enables automatic RMI4 detection without
requiring the psmouse.synaptics_intertouch parameter, and matches
the behavior of similar ThinkPad models already in the list
(E480/LEN2054, E580/LEN2055).

Tested on ThinkPad E490 with kernel 7.0.5-zen1 and Arch Linux.
RMI4 over SMBus is confirmed working without any kernel parameters.

Signed-off-by: Nicolás Bazaes <contacto@bazaes.cl>
Assisted-by: Claude:claude-sonnet-4-6
---
 drivers/input/mouse/synaptics.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/input/mouse/synaptics.c b/drivers/input/mouse/synaptics.c
index 26071128f..c70502e24 100644
--- a/drivers/input/mouse/synaptics.c
+++ b/drivers/input/mouse/synaptics.c
@@ -190,6 +190,7 @@ static const char * const smbus_pnp_ids[] = {
 	"LEN2044", /* L470  */
 	"LEN2054", /* E480 */
 	"LEN2055", /* E580 */
+	"LEN2058", /* E490 */
 	"LEN2068", /* T14 Gen 1 */
 	"SYN1221", /* TUXEDO InfinityBook Pro 14 v5 */
 	"SYN3003", /* HP EliteBook 850 G1 */
-- 
2.54.0