Nintendo Switch Pro Controller+Linux 5.15 (non-HID) does not register thumb sticks

Description

Analog sticks are not registered on the Nintendo Switch Pro Controller when using RetroArch with SDL2 or udev drivers.

Expected behavior

sdl2

input_driver = "sdl2"
input_device = "Nintendo Switch Pro Controller"
input_vendor_id = "1406"
input_product_id = "8201"
input_b_btn = "0"
input_y_btn = "2"
input_select_btn = "4"
input_start_btn = "6"
input_up_btn = "11"
input_down_btn = "12"
input_left_btn = "13"
input_right_btn = "14"
input_a_btn = "1"
input_x_btn = "3"
input_l_btn = "9"
input_r_btn = "10"
input_l2_axis = "+4"
input_r2_axis = "+5"
input_l3_btn = "7"
input_r3_btn = "8"
input_l_x_plus_axis = "+0"
input_l_x_minus_axis = "-0"
input_l_y_plus_axis = "+1"
input_l_y_minus_axis = "-1"
input_r_x_plus_axis = "+2"
input_r_x_minus_axis = "-2"
input_r_y_plus_axis = "+3"
input_r_y_minus_axis = "-3"

udev

input_driver = "udev"
input_device = "Pro Controller"
input_vendor_id = "1406"
input_product_id = "8201"
input_b_btn = "0"
input_y_btn = "2"
input_select_btn = "8"
input_start_btn = "9"
input_up_btn = "h0up"
input_down_btn = "h0down"
input_left_btn = "h0left"
input_right_btn = "h0right"
input_a_btn = "1"
input_x_btn = "3"
input_l_btn = "4"
input_r_btn = "5"
input_l2_btn = "6"
input_r2_btn = "7"
input_l3_btn = "10"
input_r3_btn = "11"
input_l_x_plus_axis = "+0"
input_l_x_minus_axis = "-0"
input_l_y_plus_axis = "+1"
input_l_y_minus_axis = "-1"
input_r_x_plus_axis = "+2"
input_r_x_minus_axis = "-2"
input_r_y_plus_axis = "+3"
input_r_y_minus_axis = "-3"

Actual behavior

sdl2

input_driver = "sdl2"
input_device = "Nintendo Switch Pro Controller"
input_vendor_id = "1406"
input_product_id = "8201"
input_b_btn = "0"
input_y_btn = "2"
input_select_btn = "4"
input_start_btn = "6"
input_up_btn = "11"
input_down_btn = "12"
input_left_btn = "13"
input_right_btn = "14"
input_a_btn = "1"
input_x_btn = "3"
input_l_btn = "9"
input_r_btn = "10"
input_l2_axis = "+4"
input_r2_axis = "+5"
input_l3_btn = "7"
input_r3_btn = "8"
input_l_x_minus_axis = "-0"
input_l_y_plus_axis = "+1"
input_l_y_minus_axis = "-1"
input_r_x_minus_axis = "-2"
input_r_y_plus_axis = "+3"

udev

input_driver = "udev"
input_device = "Pro Controller"
input_vendor_id = "1406"
input_product_id = "8201"
input_b_btn = "0"
input_y_btn = "2"
input_select_btn = "8"
input_start_btn = "9"
input_up_btn = "h0up"
input_down_btn = "h0down"
input_left_btn = "h0left"
input_right_btn = "h0right"
input_a_btn = "1"
input_x_btn = "3"
input_l_btn = "4"
input_r_btn = "5"
input_l2_btn = "6"
input_r2_btn = "7"
input_l3_btn = "10"
input_r3_btn = "11"
input_l_x_minus_axis = "-0"
input_l_y_plus_axis = "+1"
input_l_y_minus_axis = "-1"
input_r_x_minus_axis = "-2"
input_r_y_plus_axis = "+3"

Steps to reproduce the bug

1. Navigate to Settings -> Drivers -> Controller, and select the controller driver "sdl2" or "udev".
2. Restart RetroArch to apply the new setting.
3. Go to Settings -> Input -> RetroPad Binds -> Port 1 Controls
4. Click on "Set All Controls"
5. Notice that these axes do not register any input: "Left Analog X+ (Right)", "Right Analog Y- (Up)", "Right Analog X+ (Right)".
6. Click on "Save Controller Profile".
7. Close RetroArch
8. Open the generated autoconfig file and expand both the udev and the sdl2 file since their generated thumb stick input variables are identical (but not the rest of their content)

expand:

input_l_x_minus_axis = "-0"
input_l_y_plus_axis = "+1"
input_l_y_minus_axis = "-1"
input_r_x_minus_axis = "-2"
input_r_y_plus_axis = "+3"

to:

# input_l_x_plus_axis has manually been set here: Nintendo Switch Pro Controller+Linux 5.15 (non-HID) does not register thumb sticks - https://github.com/libretro/RetroArch/issues/16905
input_l_x_plus_axis = "+0"
input_l_x_minus_axis = "-0"
input_l_y_plus_axis = "+1"
input_l_y_minus_axis = "-1"
# input_r_x_plus_axis has manually been set here: Nintendo Switch Pro Controller+Linux 5.15 (non-HID) does not register thumb sticks - https://github.com/libretro/RetroArch/issues/16905
input_r_x_plus_axis = "+2"
input_r_x_minus_axis = "-2"
input_r_y_plus_axis = "+3"
# input_r_y_minus_axis has manually been set here: Nintendo Switch Pro Controller+Linux 5.15 (non-HID) does not register thumb sticks - https://github.com/libretro/RetroArch/issues/16905
input_r_y_minus_axis = "-3"

10. Save the changes in the file.
11. Open RetroArch
12. Navigate to Main Menu -> Load Core
13. Click on Start Remote RetroPad
14. All axes (up, down, left, right) on the thumb sticks will be indicated in Remote RetroPad when evaluate them.

Version/Commit

• RetroArch: 1.19.1 Flatpak

OS

Trisquel 11.0/Ubuntu MATE 22.04

Start by reproducing the issue with the sdl2 and udev controller drivers in RetroArch 1.19.1, then inspect the generated autoconfig entries shown in the report. Verify the four missing thumb-stick axis assignments and confirm that a fix makes all axes register in Remote RetroPad without manual edits.