From af673684e2748fe9c3f843e1eacd0ac992d227ca Mon Sep 17 00:00:00 2001
From: Roman Priesol <roman@priesol.net>
Date: Sat, 12 Sep 2026 16:57:54 +0200
Subject: [PATCH] Auto-detach usblp kernel driver before claiming the Datamax
 USB interface

---
 app.rb | 1 +
 1 file changed, 1 insertion(+)

diff --git a/app.rb b/app.rb
index eda09e7..ec5eaba 100644
--- a/app.rb
+++ b/app.rb
@@ -99,6 +99,7 @@ helpers do
     end
 
     device.open do |handle|
+      handle.auto_detach_kernel_driver = true # usblp kernel driver otherwise holds the interface
       handle.claim_interface(0) do
         handle.bulk_transfer(endpoint: DATAMAX_ENDPOINT, dataOut: data)
       end