From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <b3edafb6cd22c62668e80d2f41ab80bd@hamnavoe.com>
To: 9fans@9fans.net
From: Richard Miller <9fans@hamnavoe.com>
Date: Wed,  6 May 2015 09:32:12 +0100
In-Reply-To: <CAKCGbV5fadKSv4B37XGDAU_+OfFRcHY6dVXGPR21s=F8jFHx0g@mail.gmail.com>
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Subject: Re: [9fans] jumpy usb mouse on 9pi
Topicbox-Message-UUID: 4fa1d91c-ead9-11e9-9d60-3106f5b1d025

> moving the
> mouse causes the cursor to jump erratically around the screen, almost
> exclusively in the vertical direction, along with rio registering button
> presses even though I'm not pressing any.

This happens when the usb keyboard/mouse driver misinterprets the HID
protocol description in the device configuration.  Incidentally this
is not specific to 9pi -- Plan 9 uses the same usb device drivers on
all platforms.

Try forcing the mouse to use the simpler boot protocol, by appending
'kbargs=-b' to the command line in cmdline.txt (on dos partition).