<div dir="ltr">Dear Peter Hutterer, > On Thu, Oct 22, 2020 at 4:11 PM Peter Hutterer <<a href="mailto:peter.hutterer@who-t.net">peter.hutterer@who-t.net</a>> wrote: > > ftr, you should really use the device name instead of the id since the id is not guaranteed to be static. Thanks a lot for your kind comment. I will do so. > my bet is mutter (or gnome-settings-daemon on older versions) since it's the > only one I know of that would do screen mapping. but I don't know what > versions 18.04 ships and even then I wouldn't know the details, especially > not for ubuntu. Thank you very much again. I have tried to update the suspicious packages from Ubuntu 20.04, or to build from the source of the newer version. They were not successful because the dependency was too complex and I've concluded that I cannot recommend my customer to update so many packages that may result in an unstable system. Instead, I've made a daemon program that creates a virtual uinput touch device and transforms touch positions according to its own transformation configuration. I really appreciate your help. Without your help, I couldn't solve this problem. Best regards, Hugh Chang </div>