[Bug 221090] New: intel-hid: Tablet mode switch not working on Dell 14 Plus 2-in-1 DB04250

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=221090

            Bug ID: 221090
           Summary: intel-hid: Tablet mode switch not working on Dell 14
                    Plus 2-in-1 DB04250
           Product: Drivers
           Version: 2.5
    Kernel Version: 6.18.7
          Hardware: Intel
                OS: Linux
            Status: NEW
          Severity: low
          Priority: P3
         Component: Platform_x86
          Assignee: drivers_platform_x86@kernel-bugs.osdl.org
          Reporter: peter.metz@unarin.com
        Regression: No

Description:


On the Dell 14 Plus 2-in-1 (DB04250), the tablet mode switch is not reported to
userspace. The device identifies itself as a "Notebook" (Chassis Type 10),
which causes intel-hid to skip the dmi_vgbs_allow_list check and ignore the
VGBS method.

Evidence:


- DMI Product Name: Dell 14 Plus 2-in-1 DB04250
- DMI Chassis Type: 10 (Notebook)

Verified Fix: Manually adding this model to dmi_vgbs_allow_list in
drivers/platform/x86/intel/hid.c enables full functionality (tablet mode starts
working).

```
$ cat /sys/class/dmi/id/product_name
Dell 14 Plus 2-in-1 DB04250 
```

```
$ cat /sys/class/dmi/id/sys_vendor
Dell Inc.
```

```
$ sudo acpidump | grep "VGBS"
   28670: 30 4C 50 43 42 45 43 44 56 56 47 42 53 A1 0F A0  0LPCBECDVVGBS...
   28870: 14 4C 07 56 47 42 53 08 41 44 42 47 0D 56 47 42  .L.VGBS.ADBG.VGB

```

```
$ sudo dmidecode -t system
# dmidecode 3.7
Getting SMBIOS data from sysfs.
SMBIOS 3.8 present.

Handle 0x0100, DMI type 1, 27 bytes
System Information
        Manufacturer: Dell Inc.
        Product Name: Dell 14 Plus 2-in-1 DB04250
        Version: Not Specified
        Serial Number: *****
        UUID: *****
        Wake-up Type: Power Switch
        SKU Number: 0D2D
        Family: Dell Laptops

Handle 0x0C00, DMI type 12, 5 bytes
System Configuration Options
        Option 1: J6H1:1-X Boot with Default; J8H1:1-X BIOS RECOVERY

Handle 0x2000, DMI type 32, 11 bytes
System Boot Information
        Status: No errors detected
```

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