From: Rahul Chandra rahul@chandra.net
[ Upstream commit 7dc6b2d3b5503bcafebbeaf9818112bf367107b4 ]
Add a DMI quirk entry for the ASUS Zenbook Duo UX8406CA 2025 model to use the existing zenbook duo keyboard quirk.
Signed-off-by: Rahul Chandra rahul@chandra.net Link: https://lore.kernel.org/r/20250624073301.602070-1-rahul@chandra.net Reviewed-by: Ilpo Järvinen ilpo.jarvinen@linux.intel.com Signed-off-by: Ilpo Järvinen ilpo.jarvinen@linux.intel.com Signed-off-by: Sasha Levin sashal@kernel.org ---
**YES**
This commit should be backported to stable kernel trees. Here's the extensive explanation:
## Analysis of the Code Changes
The commit adds a simple DMI quirk entry for the ASUS Zenbook Duo UX8406CA:
```c + { + .callback = dmi_matched, + .ident = "ASUS Zenbook Duo UX8406CA", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."), + DMI_MATCH(DMI_PRODUCT_NAME, "UX8406CA"), + }, + .driver_data = &quirk_asus_zenbook_duo_kbd, + }, ```
This applies the existing `quirk_asus_zenbook_duo_kbd` to the UX8406CA model.
## Why This Is a Bug Fix, Not Just Hardware Enablement
Based on my analysis of the kernel repository, the `quirk_asus_zenbook_duo_kbd` was introduced to fix a specific hardware issue where:
1. **The keyboard emits spurious wireless disable keypresses** when placed on the laptop's secondary display 2. **This causes unexpected WiFi disconnections** via the rfkill system 3. **The keyboard doesn't actually have wireless toggle functionality**, so these events are always spurious
## Evidence Supporting Backporting
1. **Fixes User-Impacting Bug**: Without this quirk, users experience unexpected WiFi disconnections when using their keyboard normally, which significantly impacts usability.
2. **Follows Established Pattern**: The commit follows the exact pattern of the previous UX8406MA support (commit 9286dfd5735b), which addressed the same issue for a similar model.
3. **Minimal Risk**: The change is: - Only 9 lines of code - Isolated to specific hardware (only affects UX8406CA) - Uses existing, tested infrastructure - Cannot affect other systems due to DMI matching
4. **Similar to Other Backported Commits**: Looking at the reference commits: - Commit 2b1cb70 (adding support for ALS on UX430UQ) was backported - Commit ac16dfa (reverting GA401/GA502 quirks) was backported - Commit 82a7228 (adding tablet mode quirk for ROG Flow X13) was backported
5. **Clear Bug Fix Nature**: Unlike commit 79493de (making use of dmi->ident) which was NOT backported because it was just a code improvement, this commit actually fixes broken functionality.
## Comparison with Reference Commits
This commit is most similar to: - **Commit 2b1cb70** (YES): Added device-specific quirk to fix functionality - **Commit 82a7228** (YES): Added quirk to fix hardware-specific issue - **Commit 25390f8** (YES): Added device support to fix existing hardware
And dissimilar to: - **Commit 79493de** (NO): Code refactoring without functional impact
## Conclusion
This commit meets all criteria for stable backporting: - Fixes a real bug affecting users - Small, contained change - Low risk of regression - Follows established patterns - Only affects specific hardware
The commit should be backported to stable kernels that contain the `quirk_asus_zenbook_duo_kbd` infrastructure (6.11+).
drivers/platform/x86/asus-nb-wmi.c | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/drivers/platform/x86/asus-nb-wmi.c b/drivers/platform/x86/asus-nb-wmi.c index 3f8b2a324efdf..f84c3d03c1de7 100644 --- a/drivers/platform/x86/asus-nb-wmi.c +++ b/drivers/platform/x86/asus-nb-wmi.c @@ -530,6 +530,15 @@ static const struct dmi_system_id asus_quirks[] = { }, .driver_data = &quirk_asus_zenbook_duo_kbd, }, + { + .callback = dmi_matched, + .ident = "ASUS Zenbook Duo UX8406CA", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."), + DMI_MATCH(DMI_PRODUCT_NAME, "UX8406CA"), + }, + .driver_data = &quirk_asus_zenbook_duo_kbd, + }, {}, };