README.asciidoc: rephrase the part about USB IDs

Those devices does not always use the Actions Micro Vendor ID in display
mode, some Philips ones don't for instance, so tell that the IDs
mentioned are just examples.

Also mention that usb-modeswitch perform the mode change automatically
now.

diff --git a/README.asciidoc b/README.asciidoc
index 488dc10..26ca6ea 100644 (file)
--- a/README.asciidoc
+++ b/README.asciidoc
@@ -28,13 +28,16 @@ The devices supported by libam7xxx use USB bulk transfers and a simple packet
 based protocol to exchange data and commands to and from a host system and the
 AM7XXX chip.
 
-Those with USB VendorID +1de1+ are devices based on Actions Micro/Action Media
-designs, usually having two modes:
+Devices based on Actions Micro/Action Media designs generally use the USB
+VendorID +1de1+, and they can have two operational modes:
 
- - USB Mass Storage mode (ProductID: +1101+)
- - Generic bulk data transfer mode (ProductID: +c101+)
+ - USB Mass Storage mode (e.g. ProductID: +1101+)
+ - Generic bulk data transfer mode, or Display mode (e.g. ProductID: +c101+)
 
-The mode can be switched with the command:
+On recent GNU/Linux systems the switch from Mass Storage mode to Display mode
+is performed automatically by
+http://www.draisberghof.de/usb_modeswitch/[USB_ModeSwitch], or can be done
+manually with the command:
 
  $ sudo usb_modeswitch \
    --default-vendor 0x1de1 \