Public bug reported:

Hello
dmesg:
[    0.826524] i2c_hid i2c-MSFT0001:00: supply vdd not found, using dummy 
regulator
[    0.826538] i2c_hid i2c-MSFT0001:00: supply vddl not found, using dummy 
regulator
Best regards 

DistroRelease: Ubuntu 20.04
Kernel: 5.4.*,5.7.*,5.8.*
Processor: AMD Ryzen 4600H
lspci:
00:00.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir Root Complex
00:00.2 IOMMU: Advanced Micro Devices, Inc. [AMD] Renoir IOMMU
00:01.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir PCIe Dummy Host 
Bridge
00:01.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Renoir PCIe GPP Bridge
00:01.2 PCI bridge: Advanced Micro Devices, Inc. [AMD] Renoir PCIe GPP Bridge
00:02.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir PCIe Dummy Host 
Bridge
00:02.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Renoir PCIe GPP Bridge
00:08.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir PCIe Dummy Host 
Bridge
00:08.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Renoir Internal PCIe GPP 
Bridge to Bus
00:08.2 PCI bridge: Advanced Micro Devices, Inc. [AMD] Renoir Internal PCIe GPP 
Bridge to Bus
00:14.0 SMBus: Advanced Micro Devices, Inc. [AMD] FCH SMBus Controller (rev 51)
00:14.3 ISA bridge: Advanced Micro Devices, Inc. [AMD] FCH LPC Bridge (rev 51)
00:18.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir Device 24: 
Function 0
00:18.1 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir Device 24: 
Function 1
00:18.2 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir Device 24: 
Function 2
00:18.3 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir Device 24: 
Function 3
00:18.4 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir Device 24: 
Function 4
00:18.5 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir Device 24: 
Function 5
00:18.6 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir Device 24: 
Function 6
00:18.7 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir Device 24: 
Function 7
01:00.0 VGA compatible controller: NVIDIA Corporation Device 1f99 (rev a1)
01:00.1 Audio device: NVIDIA Corporation Device 10fa (rev a1)
02:00.0 Non-Volatile memory controller: Samsung Electronics Co Ltd NVMe SSD 
Controller SM981/PM981/PM983
03:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 
PCI Express Gigabit Ethernet Controller (rev 15)
04:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] 
Renoir (rev c7)
04:00.2 Encryption controller: Advanced Micro Devices, Inc. [AMD] Family 17h 
(Models 10h-1fh) Platform Security Processor
04:00.3 USB controller: Advanced Micro Devices, Inc. [AMD] Renoir USB 3.1
04:00.4 USB controller: Advanced Micro Devices, Inc. [AMD] Renoir USB 3.1
04:00.5 Multimedia controller: Advanced Micro Devices, Inc. [AMD] 
Raven/Raven2/FireFlight/Renoir Audio Processor (rev 01)
04:00.6 Audio device: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 
10h-1fh) HD Audio Controller
05:00.0 SATA controller: Advanced Micro Devices, Inc. [AMD] FCH SATA Controller 
[AHCI mode] (rev 81)
05:00.1 SATA controller: Advanced Micro Devices, Inc. [AMD] FCH SATA Controller 
[AHCI mode] (rev 81)

//lspci isn't showing touchpad
/////////////////////////////////////////////////////////////////////////////////////////////////
xinput:

⎡ Virtual core pointer                          id=2    [master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer                id=4    [slave  pointer  (2)]
⎜   ↳ ITE Tech. Inc. ITE Device(8910) Consumer Control  id=13   [slave  pointer 
 (2)]
⎜   ↳ MSFT0001:00 04F3:3140 Mouse               id=15   [slave  pointer  (2)]
⎜   ↳ MSFT0001:00 04F3:3140 Touchpad            id=16   [slave  pointer  (2)]
⎣ Virtual core keyboard                         id=3    [master keyboard (2)]
    ↳ Virtual core XTEST keyboard               id=5    [slave  keyboard (3)]
    ↳ Power Button                              id=6    [slave  keyboard (3)]
    ↳ Video Bus                                 id=7    [slave  keyboard (3)]
    ↳ Video Bus                                 id=8    [slave  keyboard (3)]
    ↳ Power Button                              id=9    [slave  keyboard (3)]
    ↳ Integrated Camera: Integrated C           id=10   [slave  keyboard (3)]
    ↳ ITE Tech. Inc. ITE Device(8910) Wireless Radio Control    id=11   [slave  
keyboard (3)]
    ↳ ITE Tech. Inc. ITE Device(8910) Keyboard  id=12   [slave  keyboard (3)]
    ↳ Ideapad extra buttons                     id=14   [slave  keyboard (3)]
    ↳ AT Translated Set 2 keyboard              id=17   [slave  keyboard (3)]
    ↳ ITE Tech. Inc. ITE Device(8910) Consumer Control  id=18   [slave  
keyboard (3)]
////////////////////////////////////////////////////////////////////////////////////

Under OS that can use this device (e.g. MS_win10):
Device Type: Firmware 
Manufacturer: Elantech Ltd.
Location: On UEFI
UEFI\RES_{234124e9-40b7-43ef-9b5e-97470808d440}&REV_2
UEFI\RES_{234124e9-40b7-43ef-9b5e-97470808d440}

//////////////////////////////////////////////////////////////////////////////////
modify kernel source code can make this device work but not very well

can't find vendorID anywhere

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "hwinfo output"
   https://bugs.launchpad.net/bugs/1890327/+attachment/5398746/+files/hwinfo

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https://bugs.launchpad.net/bugs/1890327

Title:
  MSFT touchpad not working [    0.826524] i2c_hid i2c-MSFT0001:00:
  supply vdd not found, using dummy regulator

Status in linux package in Ubuntu:
  New

Bug description:
  Hello
  dmesg:
  [    0.826524] i2c_hid i2c-MSFT0001:00: supply vdd not found, using dummy 
regulator
  [    0.826538] i2c_hid i2c-MSFT0001:00: supply vddl not found, using dummy 
regulator
  Best regards 

  DistroRelease: Ubuntu 20.04
  Kernel: 5.4.*,5.7.*,5.8.*
  Processor: AMD Ryzen 4600H
  lspci:
  00:00.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir Root Complex
  00:00.2 IOMMU: Advanced Micro Devices, Inc. [AMD] Renoir IOMMU
  00:01.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir PCIe Dummy 
Host Bridge
  00:01.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Renoir PCIe GPP Bridge
  00:01.2 PCI bridge: Advanced Micro Devices, Inc. [AMD] Renoir PCIe GPP Bridge
  00:02.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir PCIe Dummy 
Host Bridge
  00:02.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Renoir PCIe GPP Bridge
  00:08.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir PCIe Dummy 
Host Bridge
  00:08.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Renoir Internal PCIe 
GPP Bridge to Bus
  00:08.2 PCI bridge: Advanced Micro Devices, Inc. [AMD] Renoir Internal PCIe 
GPP Bridge to Bus
  00:14.0 SMBus: Advanced Micro Devices, Inc. [AMD] FCH SMBus Controller (rev 
51)
  00:14.3 ISA bridge: Advanced Micro Devices, Inc. [AMD] FCH LPC Bridge (rev 51)
  00:18.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir Device 24: 
Function 0
  00:18.1 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir Device 24: 
Function 1
  00:18.2 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir Device 24: 
Function 2
  00:18.3 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir Device 24: 
Function 3
  00:18.4 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir Device 24: 
Function 4
  00:18.5 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir Device 24: 
Function 5
  00:18.6 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir Device 24: 
Function 6
  00:18.7 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir Device 24: 
Function 7
  01:00.0 VGA compatible controller: NVIDIA Corporation Device 1f99 (rev a1)
  01:00.1 Audio device: NVIDIA Corporation Device 10fa (rev a1)
  02:00.0 Non-Volatile memory controller: Samsung Electronics Co Ltd NVMe SSD 
Controller SM981/PM981/PM983
  03:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. 
RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 15)
  04:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] 
Renoir (rev c7)
  04:00.2 Encryption controller: Advanced Micro Devices, Inc. [AMD] Family 17h 
(Models 10h-1fh) Platform Security Processor
  04:00.3 USB controller: Advanced Micro Devices, Inc. [AMD] Renoir USB 3.1
  04:00.4 USB controller: Advanced Micro Devices, Inc. [AMD] Renoir USB 3.1
  04:00.5 Multimedia controller: Advanced Micro Devices, Inc. [AMD] 
Raven/Raven2/FireFlight/Renoir Audio Processor (rev 01)
  04:00.6 Audio device: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 
10h-1fh) HD Audio Controller
  05:00.0 SATA controller: Advanced Micro Devices, Inc. [AMD] FCH SATA 
Controller [AHCI mode] (rev 81)
  05:00.1 SATA controller: Advanced Micro Devices, Inc. [AMD] FCH SATA 
Controller [AHCI mode] (rev 81)

  //lspci isn't showing touchpad
  
/////////////////////////////////////////////////////////////////////////////////////////////////
  xinput:

  ⎡ Virtual core pointer                        id=2    [master pointer  (3)]
  ⎜   ↳ Virtual core XTEST pointer                      id=4    [slave  pointer 
 (2)]
  ⎜   ↳ ITE Tech. Inc. ITE Device(8910) Consumer Control        id=13   [slave  
pointer  (2)]
  ⎜   ↳ MSFT0001:00 04F3:3140 Mouse                     id=15   [slave  pointer 
 (2)]
  ⎜   ↳ MSFT0001:00 04F3:3140 Touchpad                  id=16   [slave  pointer 
 (2)]
  ⎣ Virtual core keyboard                       id=3    [master keyboard (2)]
      ↳ Virtual core XTEST keyboard                     id=5    [slave  
keyboard (3)]
      ↳ Power Button                                    id=6    [slave  
keyboard (3)]
      ↳ Video Bus                                       id=7    [slave  
keyboard (3)]
      ↳ Video Bus                                       id=8    [slave  
keyboard (3)]
      ↳ Power Button                                    id=9    [slave  
keyboard (3)]
      ↳ Integrated Camera: Integrated C                 id=10   [slave  
keyboard (3)]
      ↳ ITE Tech. Inc. ITE Device(8910) Wireless Radio Control  id=11   [slave  
keyboard (3)]
      ↳ ITE Tech. Inc. ITE Device(8910) Keyboard        id=12   [slave  
keyboard (3)]
      ↳ Ideapad extra buttons                           id=14   [slave  
keyboard (3)]
      ↳ AT Translated Set 2 keyboard                    id=17   [slave  
keyboard (3)]
      ↳ ITE Tech. Inc. ITE Device(8910) Consumer Control        id=18   [slave  
keyboard (3)]
  
////////////////////////////////////////////////////////////////////////////////////

  Under OS that can use this device (e.g. MS_win10):
  Device Type: Firmware 
  Manufacturer: Elantech Ltd.
  Location: On UEFI
  UEFI\RES_{234124e9-40b7-43ef-9b5e-97470808d440}&REV_2
  UEFI\RES_{234124e9-40b7-43ef-9b5e-97470808d440}

  
//////////////////////////////////////////////////////////////////////////////////
  modify kernel source code can make this device work but not very well

  can't find vendorID anywhere

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