>> On 1 Dec 2018, at 13:06, Alexander Theißen wrote:
>>
>> Hi Mattias,
>>
>> I am writing you because you edited the drivers/usb/misc/appledisplay.c driver and I am hoping that you are a user of that driver.
>>
>> How do you use that driver? For me the hid driver always claims the device. I have to manually bind the driver to the display to have it bound to the appledisplay driver. Shouldn't it be rather a hid driver to have the driver bound without userspace intervention?
> This is what used to happen to me until I added my display as an supported device in the appledisplay driver. If you can reply with the results of;
> * uname -rv
> * lsusb -d 05ac: -v
> while the display is connected I can check if your device is missing from the list of supported devices.
I did the same thing. My display was also not listed as a supported device. I added the product ID (0x9226) to appledisplay.c, build the module, copied it over the existing module at /lib/modules and ran depmod. Now the module is loaded by udev but still bound to hid-generic because this module is loaded fist I guess. I did not rebuild the whole kernel. Just replaced the module because currently I am using the ubuntu 18.10 kernel. The driver works fine when I manually unbind the hid driver from the device and reinsert the appledisplay driver.
uname -rv
4.18.0-11-generic #12-Ubuntu SMP Tue Oct 23 19:22:37 UTC 2018
lsusb -d 05ac:9226 -v
Bus 001 Device 010: ID 05ac:9226 Apple, Inc. LED Cinema Display
Couldn't open device, some information will be missing
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.10
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x05ac Apple, Inc.
idProduct 0x9226 LED Cinema Display
bcdDevice 2.99
iManufacturer 1
iProduct 2
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 34
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xc0
Self Powered
MaxPower 2mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 3 Human Interface Device
bInterfaceSubClass 0 No Subclass
bInterfaceProtocol 0 None
iInterface 0
HID Device Descriptor:
bLength 9
bDescriptorType 33
bcdHID 1.11
bCountryCode 0 Not supported
bNumDescriptors 1
bDescriptorType 34 Report
wDescriptorLength 78
Report Descriptors:
** UNAVAILABLE **
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 100
>>
>> Regards
>> Alexander
>>
> I believe that it is common practice to also CC a public mailing, in this case at least the following list: linux-usb@xxxxxxxxxxxxxxx. So please do so when you reply.
Done!
Regards
Alexander
