+
+acer_al711_on_dp_dm_hdmi_vga.sr
+-------------------------------
+
+This setup is somewhat more evolved, as it used a computer with a
+dual-mode displayport (DP++), a DP-HDMI (Type 1) adapter, a HDMI DDC
+breakout cable, a HDMI-VGA adapter, and a CRT screen with VGA input.
+
+The logic analyzer was connected to the DDC bus between the two adapters
+above, i.e. on the HDMI connection. As the DP-HDMI adapter uses a level
+shifter between DP and HDMI DDC busses, also the communication between
+computer and the DP adapter is visible (the DDC busses on both side are
+physically connected). The DP-HDMI adapter is visible at I2C address
+0x40 and responds with the readonly identifier 'DP-HDMI Adaptor<EOT>'.
+
+The HDMI-VGA adapter modifies the EDID contents from the VGA moniter,
+it adds an CEA extension block at offset 0x80 and notifies the existence
+of the extension block in the first block.