If you’re using your Raspberry Pi 7″ touchscreen in a case, you might find that if the case has a stand then the screen might be upside down.
You can easily rotate it 180 by adding this line to /boot/config.txt:
lcd_rotate=2
From the FAQ here.
VNC remote desktop to a Raspberry Pi
I normally ssh into my remote Raspberry Pi’s, but if you don’t have then attached to a monitor and need to get a desktop view of what’s going on, a VNC remote connection works great. Step by step instructions here.
Raspbian USB disconnects and USB keyboards
I was looking for a solution to a USB soundcard that would randomly disconnect from my Raspberry Pi (it’s a Signalink USB soundcard/radio interface for amateur radio). Turns out, the issue I was seeing was caused by RF getting into somewhere when my radio was keying up – when I moved the HT radio further away from the Pi (only as far as the length of the connecting cable, a few feet) then my problems stopped. This could probably be avoided better with some snap-on ferrite beads.
In this post (and others), there is a suggestion about adding dwc_otg.speed=1 to your /boot/cmdline.txt. I tried this for a while and this didn’t seem to make any difference to my USB disconnects for this particular USB soundcard. It did however stop a USB keyboard from being recognized (a Gear Head Mini USB). Remembering I had added this param and then removing it solved my keyboard issue.
Lesson learnt: if trying out solutions to problems by trial and error, if something doesn’t work, remember to remove it afterwards in case it breaks other stuff 🙂
Resolving SSH laggy responsiveness over Wifi on Raspberry Pi / Raspbian
It’s interesting to note that turning off the power saving features for the common Wifi dongle chipsets used on Raspbian seems to fix not only the pauses where before it would sleep during inactivity, but also it seems to fix/improve the laggy responsiveness even when typing commands over SSH to a Pi. Links to the settings in my previous post here.