[Bug 220043] Waveshare 7'' USB touchscreen display not fully supported

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=220043

            Bug ID: 220043
           Summary: Waveshare 7'' USB touchscreen display not fully
                    supported
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: usb
          Assignee: freebsd-usb at FreeBSD.org
          Reporter: bcr at FreeBSD.org

Created attachment 183528
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=183528&action=edit
Collection of usbconfig dumps and info

I bought the following device [1] (without the bicolor case) for my raspberry
pi 0. 
The device can be used on any computer with an HDMI interface and acts as a
small secondary monitor. I wanted to use it on my RPI-0, but I encountered the
following problems:

- When I boot the system, it tries to sync to the proper resolution, resulting
in horizontal lines being printed. No text is visible. This continues even
after the RPI-0 has finished booting. When I switch to another monitor and
back, the Waveshare display displays the login screen as usual. However, the
bottom part is cut off. When rebooting with the Waveshare connected, it tries
to detect the resolution again without success (horizontal lines again).
It seems to not get the proper screen resolution and even when I hook up
another monitor, switch back to the waveshare, and login, it is missing parts
of the right side of the screen and the bottom parts (for example, I can't see
the end of a man page). 

The manufacturer provides these instructions for Raspbian (config.txt):
max_usb_current=1
hdmi_group=2
hdmi_mode=1
hdmi_mode=87
hdmi_cvt 1024 600 60 6 0 0 0

I tried setting the 1024x600 resolution in rc.conf for vt, but it had no
effect.

I saw the 5'' model from the same manufacturer work correctly with FreeBSD, so
I assume the 7'' model needs just a few adjustments. The output of usbconfig is
attached. 

Let me know if you need more information. I can test patches and provide
feedback.

Thank you! 

Benedict

[1] http://www.waveshare.com/wiki/7inch_HDMI_LCD_(B)

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