Public bug reported:
Summary:
On the HP EliteBook x360 1040 G7 Notebook PC, the keyboard backlight is not
exposed under /sys/class/leds/. The hp-wmi module loads successfully, but no
hp::kbd_backlight device appears.
System Information
Manufacturer: HP
Product Name: HP EliteBook x360 1040 G7 Notebook PC
Version: SBKPFV3
BIOS Version: S93 Ver. 01.22.00
BIOS Release Date: 07/03/2025
Kernel & OS
Ubuntu 24.04 LTS (up-to-date)
Kernel: 6.14.0-29-generic
Steps to Reproduce
Boot into Ubuntu.
Run ls /sys/class/leds/
Only capslock, numlock, scrolllock, and phy0-led appear.
No hp::kbd_backlight.
Load the driver manually:
sudo modprobe hp-wmi
ls /sys/class/leds/
Same result (no backlight LED device).
Observed Behavior
hp_wmi module loads correctly (lsmod confirms).
/sys/class/leds/ does not expose hp::kbd_backlight.
Keyboard backlight toggle (Fn+F4) has no effect in Ubuntu.
Expected Behavior
hp::kbd_backlight should appear under /sys/class/leds/ when hp-wmi is
loaded.
Keyboard backlight should be controllable (values 0–2).
Additional Information
$ lsmod | grep hp
hp_wmi 36864 0
platform_profile 20480 1 hp_wmi
sparse_keymap 12288 2 hp_wmi,intel_hid
wmi 28672 4 hp_wmi,video,intel_wmi_thunderbolt,wmi_bmof
$ ls /sys/class/leds/
input4::capslock
input4::numlock
input4::scrolllock
phy0-led
Analysis
The issue appears to be that the DMI string for this model:
"HP EliteBook x360 1040 G7 Notebook PC"
is not currently recognized by the hp-wmi driver.
Adding this model to the hp_wmi_dmi_table should allow the driver to expose the
keyboard backlight device.
Suggested Fix
Patch drivers/platform/x86/hp-wmi.c to include:
{
.ident = "HP EliteBook x360 1040 G7 Notebook PC",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "HP"),
DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook x360 1040 G7 Notebook PC"),
},
},
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/2126598
Title:
HP EliteBook x360 1040 G7 – Keyboard Backlight Not Detected
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2126598/+subscriptions
--
ubuntu-bugs mailing list
[email protected]
https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
