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  1. Bug #1752437
  2. Comment #27

Comment 27 for bug 1752437

Revision history for this message
In , g.fitch (g.fitch-linux-kernel-bugs) wrote :

Hi Lukas,

I tested it with KDE 5 (17.12.3) with one of the drm-next kernels:
Linux tau-ceti 4.16.0-rc7-gc5902206599d-dirty #4 SMP PREEMPT Sun Apr 15 17:37:13 BST 2018 x86_64 AMD Ryzen 5 2500U with Radeon Vega Mobile Gfx AuthenticAMD GNU/Linux

Your patch works fine for the touchscreen on this laptop - touchscreen is detectable and usable with both finger and the supplied pen.

The relevant bit of dmesg is:

Apr 15 17:47:11 tau-ceti kernel: i2c_designware AMDI0010:00: ACPI slave is not supported yet
Apr 15 17:47:11 tau-ceti kernel: i2c_designware AMDI0010:00: Standard-mode HCNT:LCNT = 642:749
Apr 15 17:47:11 tau-ceti kernel: i2c_designware AMDI0010:00: Fast-mode HCNT:LCNT = 132:239
Apr 15 17:47:11 tau-ceti kernel: i2c_designware AMDI0010:00: GPIO lookup for consumer scl
Apr 15 17:47:11 tau-ceti kernel: i2c_designware AMDI0010:00: using ACPI for GPIO lookup
Apr 15 17:47:11 tau-ceti kernel: acpi AMDI0010:00: GPIO: looking up scl-gpios
Apr 15 17:47:11 tau-ceti kernel: acpi AMDI0010:00: GPIO: looking up scl-gpio
Apr 15 17:47:11 tau-ceti kernel: i2c_designware AMDI0010:00: using lookup tables for GPIO lookup
Apr 15 17:47:11 tau-ceti kernel: i2c_designware AMDI0010:00: lookup for GPIO scl failed
Apr 15 17:47:11 tau-ceti kernel: i2c-dev: adapter [Synopsys DesignWare I2C adapter] registered as minor 5
Apr 15 17:47:11 tau-ceti kernel: i2c i2c-5: adapter [Synopsys DesignWare I2C adapter] registered
Apr 15 17:47:11 tau-ceti kernel: acpi ELAN0732:00: GPIO: looking up 0 in _CRS
Apr 15 17:47:11 tau-ceti kernel: gpio gpiochip0: Persistence not supported for GPIO 89
Apr 15 17:47:11 tau-ceti kernel: i2c_hid i2c-ELAN0732:00: probe
Apr 15 17:47:11 tau-ceti kernel: i2c i2c-5: master_xfer[0] W, addr=0x10, len=2
Apr 15 17:47:11 tau-ceti kernel: i2c i2c-5: master_xfer[1] R, addr=0x10, len=30
Apr 15 17:47:11 tau-ceti kernel: i2c_designware AMDI0010:00: i2c_dw_xfer: msgs: 2
Apr 15 17:47:11 tau-ceti kernel: i2c_designware AMDI0010:00: enabled=0x1 stat=0x10
Apr 15 17:47:11 tau-ceti kernel: i2c_designware AMDI0010:00: enabled=0x1 stat=0x504
Apr 15 17:47:11 tau-ceti last message repeated 9 times

The patch creates one issue, which is that the following warning now pops up at boot:

The battery in your keyboard ("ELAN0732:00 04F3:2537") is low, and the device may turn itself off at any time. Please replace or charge the battery as soon as possible.

However all other peripherals and buttons work fine, so it's a minor nuisance.

Thank you for getting us this far!