https://bugzilla.kernel.org/show_bug.cgi?id=199317
Bug ID: 199317
Summary: _STA method for ELAN touchpad on HP X2 10-p0xx always
returns 0
Product: ACPI
Version: 2.5
Kernel Version: 4.16
Hardware: Intel
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: ACPICA-Core
Assignee: [email protected]
Reporter: [email protected]
Regression: No
Created attachment 275151
--> https://bugzilla.kernel.org/attachment.cgi?id=275151&action=edit
decompiled dsdt
I am trying to enable multitouch support for Elan touchpads found in the HP X2
10-p0xx series. They use i2c with the same packet structure as in
elan-i2c-core.c, but the driver is not used. By doing ls /sys/bus/acpi/devices
I get no elan acpi id, but only XXXX0000:00.
I looked at the dsdt and it seems that the _INI method for this device (TPL1)
is never called.
$ sudo ./acpidbg -b 'ex \_SB.PCI0.I2C6.TPL1._HID'
Evaluating \_SB.PCI0.I2C6.TPL1._HID
Evaluation of \_SB.PCI0.I2C6.TPL1._HID returned object 00000000c70e002e,
external buffer length 28
[String] Length 08 = "XXXX0000"
Calling the _INI manually the correct _HID is set (but still doesn't show up on
/sys/bus/acpi/devices):
$ sudo ./acpidbg -b 'ex \_SB.PCI0.I2C6.TPL1._INI'
Evaluating \_SB.PCI0.I2C6.TPL1._INI
Evaluation of \_SB.PCI0.I2C6.TPL1._INI returned object 00000000a3ede7ec,
external buffer length 18
[Integer] = 0000000000000001
$ sudo ./acpidbg -b 'ex \_SB.PCI0.I2C6.TPL1._HID'
Evaluating \_SB.PCI0.I2C6.TPL1._HID
Evaluation of \_SB.PCI0.I2C6.TPL1._HID returned object 00000000a3ede7ec,
external buffer length 28
[String] Length 08 = "ELAN2317"
The _STA method checks for BDID to be != 1, but instead it is, returning always
0:
$ sudo ./acpidbg -b 'ex \_SB.PCI0.I2C6.TPL1._STA'
Evaluating \_SB.PCI0.I2C6.TPL1._STA
Evaluation of \_SB.PCI0.I2C6.TPL1._STA returned object 000000006bee48dd,
external buffer length 18
[Integer] = 0000000000000000
$ sudo ./acpidbg -b 'ex \BDID'
Evaluating \BDID
Evaluation of \BDID returned object 0000000001f1db34, external buffer length 18
[Integer] = 0000000000000001
I'm not really sure what is the cause of this. I tried on mainline, but also
4.15 had the same problem.
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