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kurikaesu / userspace-tablet-driver-daemon

Linux device drivers for non-wacom (XP-Pen, Huion, Gaomon) graphics tablets and pen displays
GNU General Public License v3.0
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"Could not get descriptor" error #38

Closed jbigler closed 2 years ago

jbigler commented 2 years ago

Beginning with the ad0e0cff7ced753f93481f429bb42541dfcd5464 commit I am no longer able to use the driver. This is with an XP-Pen 22R Pro.

Listening on socket /home/xxx/.local/var/run/userspace_tablet_driver_daemon.sock
xp_pen_handler initialized
huion_handler initialized
Handling XP-Pen Artist 22R Pro
Setup completed on interface 0
Setup completed on interface 1
Could not get descriptor
Could not claim device on attempt 0. Detaching and then waiting
Could not claim interface 0 retcode: -6 errno: 16
Could not claim device on attempt 1. Detaching and then waiting
Could not claim interface 0 retcode: -6 errno: 16
Could not claim device on attempt 2. Detaching and then waiting

The error is caused by the descriptorLength variable being hard coded to 13 when the code to attach the devices was consolidated in src/xp_pen_unified_device.cpp. In the case of the 22R Pro and some other tablets it should be 12. If the length is meaningful, it may have to be assigned as a device level variable instead of defining it in the function.

kurikaesu commented 2 years ago

Thanks for the report. I no longer have the 22r Pro in my possession so I wasn't able to test this on the device. I'll rework this to allow for the lengths to be variable as you suggested!