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14
votes
4answers
6k views

How to include RPi.GPIO in a python CGI script with lighttpd?

I've recently setup python to work with lighttpd via CGI (see here). But the minute I go to include RPi.GPIO, the script stops executing (I'm assuming because no HTML gets output), but there is no ...
17
votes
1answer
4k views

What is the difference between Raspbian kernels in official image?

In the official Raspbian "wheezy" image (2012-07-15), there are three Kernel images: kernel.img (6MB) kernel_cutdown.img (4MB) kernel_emergency.img (16MB) I'm curious what are the technical ...
23
votes
2answers
20k views

Why doesn't my external hard drive appear in /dev?

I want to mount my external HDD, but my Raspberry Pi can't recognize anything. I loaded usb-storage with modprobe, but if I insert the HDD into the USB port, nothing changes. I can't see any changes ...
15
votes
4answers
37k views

Won't boot after removing and inserting the SD Card?

I've installed Arch Linux on my SD Card with Win32DiskImager. If I shut down the RPi, remove the card, insert it, and start the RPi again, everything works fine. But if I do full system update in ...
64
votes
17answers
274k views

Easiest way to show my IP address?

After I've booted up, what's the easiest way to obtain and display the IP address that the device is currently using? I'm using Raspbian, and ifconfig doesn't appear to be installed. Are there any ...
62
votes
8answers
49k views

Is it possible to run real time software?

I know it runs Linux and there are real time patches available for Linux. Would those patches work? Has anybody tried another real-time-os on the Raspberry Pi? The idea is to use the board for ...
65
votes
5answers
76k views

How do I hard reset a Raspberry Pi?

How do I hard reset a Raspberry Pi? Obviously you can power cycle, but is there a more subtle way, like a reset pin? It would be very useful to connect a watchdog in case the Raspberry Pi crashes (...
10
votes
1answer
2k views

Is there a port of DirectFB?

The website states that progress has been made "using Raspberry PI or other Broadcom hardware". I've looked at their graphics support and BCM2835 wasn't there. If it has been ported then what are ...
18
votes
3answers
5k views

How accurate is Raspberry Pi's timekeeping?

I realize that since Raspberry Pi doesn't have a hardware real-time clock built in, some issues with accurate timekeeping may present themselves, even when persistence across reboots is not a ...
10
votes
1answer
17k views

How can I install the RT5370 WiFi dongle driver on Arch Linux?

I would like to get the Ralink RT5370 module to work on the Pi, but I couldn't find any tutorial related to the Arch Linux. How can I install the RT5370 WiFi dongle driver on Arch Linux? I found ...
17
votes
1answer
8k views

Driving a 15 KHz RGB monitor

I'm interested in the prospect of using a RP to run MAME in a real arcade cabinet. The easy way is to replace the cabinet's monitor. However I'd really like the authenticity of keeping the original ...
33
votes
4answers
10k views

How free is Raspberry Pi?

Is it legal to freely manufacture, distribute and modify Raspberry Pi? Does Raspberry Pi have a license? Are the hardware documentations and specs available to the public? Are there any restrictions ...
4
votes
1answer
774 views

No modules found in custom Arch kernel

In order to test the patch linked to in the following post: https://github.com/raspberrypi/linux/issues/29#issuecomment-6884170 I need to compile a custom kernel for my Pi. To do this, I followed the ...
10
votes
1answer
1k views

How can I use the Debian GL screensavers or any others that support hardware acceleration?

The sole purpose for my RPi is to use the DVI out functionality and I am going to rip apart a 19" LCD HD screen and build it into my own frame. I already did this with a very old notebook a few year ...
103
votes
11answers
143k views

How do I build a UPS-like - battery backup - system?

As we all know, the Raspberry Pi doesn't really use that much power (5v + 700mA is the spec). I'd like to build a battery backup for power outages in a DIY-ish fashion. I don't need surge protection ...
12
votes
2answers
5k views

How do I set up munin?

How do you set up a munin-node on the Raspberry Pi? Munin is a networked resource monitoring tool that can help analyze resource trends and "what just happened to kill our performance?" ...
8
votes
3answers
1k views

Is URxvt's slow rendering because of the limited RAM'?

My URxvt renders text very slowly, about 5 lines per second, and doesn't render fully when resized. Is this normal for Xorg and URxvt? Is this caused by the limited RAM on the RPi or by my ...
33
votes
6answers
47k views

Recommended GUI toolkit for Python development on the Raspberry Pi

I am teaching my daughter Python (and myself to some degree) using the Pi, and we have had a great time so far - but the CLI can only take us so far. I have started looking at other toolkits, ...
26
votes
2answers
43k views

How to get Python to work with Lighttpd?

I've got Lighttpd setup on my Raspberry Pi, but I'd like to get server-side code working now. I'm familiar with PHP, but I figure I should try Python as it's supposed to be the "go to" language for ...
5
votes
0answers
757 views

Is this a design fault or I shall learn how to use SD cards with PI? [closed]

My Respberry Pi Mod B arrived last week and I spent the whole weekend to try out different OSes, softwares etc. For this purpose I have to plug in and out the SD card again and again. Last night I ...
6
votes
0answers
988 views

Arch Linux kernel panics and firmware not working [closed]

Before the update I had linux-raspberrypi-3.1.9-33-arm and raspberrypi-firmware-20120418-2 installed. After I upgraded to raspberrypi-firmware-20120729-1, the kernel refused to boot (no kernel panics ...
21
votes
4answers
23k views

Easiest way to return to a known good state when overclocking

If I try to overclock my Pi, I want to go up to the point where the Pi won't boot anymore, or won't be stable enough. At this point, I want to come back to the latest known good settings for the /...
8
votes
4answers
6k views

How can I get Java Sound to work?

I have a Java-based MP3 player based on the JLayer / BasicPlayer framework which I'd like to get running on the Pi. I have installed the OpenJDK on the most current Raspbian. The BasicPlayer opens the ...
7
votes
2answers
17k views

How do I install GDM on Raspbian?

How do I install GDM and any other necessary packages for it to run on the Raspbian image?
14
votes
4answers
63k views

Problems starting X

Just whacked Raspian on an SD card, and booted up my Pi. A message at the top says 'Use startx to start a graphical interface'. So I startx. I get a load of details: OS version; X version; all that ...
15
votes
3answers
26k views

Can anyone recommend a simple image viewer?

My boss asked me to find a cheap mediaplayer for some stuff at work. That inspired me to build something on my own, using a Raspberry Pi. My plan is to use udev-rules, to detect usb/sdcard and then ...
15
votes
4answers
41k views

Where is the script for raspi-config stored in the FS on Raspbian?

While the raspi-config script makes for convenient setup on first boot, one of the reasons I have a Raspberry Pi is to help me learn what goes on behind the menu on my computers. I would like to see ...
11
votes
1answer
3k views

When set to boot in to X-server, RasPi is booting without password

Regardless of whether I boot to a GUI or to the console, I always want a password enabled on all of my machines. I've looked at as many tutorials as I can find regarding this, and although there are ...
97
votes
3answers
167k views

Boot without starting X-server

During the installation of Raspian I chose "Start X-Server after boot", but now I want to boot it once without starting the X-Server, so I've got more memory to run a program. How do I boot without ...
24
votes
2answers
9k views

Can I emulate x86 to run Windows 95?

In a comment to another question about Windows, somebody brought up a good point, Raspberry Pis have the horsepower to run older games. It just so happens that I have a favorite older game from the ...
8
votes
1answer
5k views

How to make RTL8188CUS based wireless adapters work on Arch Linux?

There are instructions for Debian but not for Arch. So far lsusb and dmesg show that the kernel detects and identifies it but the output of iwconfig shows nothing.
42
votes
4answers
60k views

How do I disable suspend mode?

Whenever I leave my Raspberry Pi on overnight, it always seems to have entered some kind of suspended state. The red power light is still on but the light on the USB WiFi device is off and I can't ...
13
votes
1answer
7k views

Do_ssh failing in initial setup

I set up my Pi, and I get output to a screen / keyboard working etc. However, when I run raspi-config, and pick the SSH option I get Initial ssh key generation still running. Please wait and try ...
23
votes
6answers
32k views

How can I connect an analog to digital converter (ADC)?

I'm looking at options for ADC on the Rasbperry Pi. I'm wondering what is possible so far. Of course easy and cheap is good.
7
votes
1answer
2k views

Xorg alternatives for Raspberry Pi architecture?

Could you list out some of the lightweight Xorg alternatives for the ARMv6?Xorg consumes a lot of resources.
15
votes
3answers
53k views

iOS on a Raspberry Pi

Now, I understand it would probably be impractical to do so, but for the "because I can" reason I'd like to try to install iOS on my Raspberry Pi. (when it eventually comes..) I've looked around for ...
17
votes
5answers
4k views

How do you protect the Raspberry Pi when you are carrying it about?

I am getting mine this week (or so I am told) and I am nervous about breaking it on the move since it looks so open and bare. How do you bring it around without breaking it? It has arrived. The ...
14
votes
4answers
21k views

Where is the kernel source for Raspbian's default 3.1.9+ kernel?

The default kernel version of Raspbian is 3.1.9+. When I try to compile an extra kernel module I have lots of error messages since the kernel header files are missing. I've checked the Raspbian ...
13
votes
3answers
8k views

Does anyone know of any kernel/driver programming tutorials?

I'm interested in using the RPi to teach myself hardware level programming. I've searched the internet for some tutorials for RPi but all I find are general "how to compile the kernel" tutorials. I'm ...
9
votes
2answers
12k views

Will router's USB port supply enough power for the Raspberry Pi?

I'd like to use the Raspberry Pi as a small server. My Linksys WRT610N router has a rear USB port and I'd like to use it to supply power to the Raspi. That way, the Raspi doesn't need to have a ...
6
votes
2answers
5k views

ALSA volume ignored when beginning playback

I ran into an interesting problem today. I noticed I don't have a "Master" channel in amixer. I only have PCM. And changing the volume on PCM is really finicky. It seems only 85%+ is actually ...
3
votes
1answer
843 views

Building ruby 1.9.3-p194 via RVM fails

Edit: Workaround is simply to use ruby 1.9.3-p125 instead. I've installed ruby version manager (I'm using Raspbian as downloaded this morning), and I ran rvm install ruby to download and compile the ...
14
votes
1answer
4k views

Automatic updating recommended?

Is it recommended to configure something to automatically keep an RPi updated? And if so, which method (cron-apt or something else)?
35
votes
4answers
28k views

What is the highest performing hardware configuration?

I know that exact benchmark numbers will vary between manufacturers, but in general if you only consider higher end flash drives, SD cards, and USB HDDs and your Raspberry Pi is connected to a network ...
85
votes
6answers
96k views

What should be done to secure Raspberry Pi?

Having tens of thousands of Raspberry Pi's connected to the internet is eventually going to capture the interest of some people who would like to do unsavory things to the little computers especially ...
18
votes
4answers
66k views

WiFi on Raspberry Pi & Raspbmc

I've been reading around, and looking for instructions to install the Edimax EW-7811UN WiFi dongle (link) on my Raspberry Pi, which is currently running RC3 of Raspbmc. From what I've read, the ...
7
votes
2answers
7k views

File config.txt with multiple lines is not working

I've been trying to get XBMC (Raspbmc to be exact) working om my Raspberry Pi. After hours of work and a lot of stupid mistakes (who knew FAT32 wasn't made for Linux), I made it work. But now I'm ...
8
votes
3answers
3k views

Are there any emulators that run without X on the Raspberry Pi?

Are there any emulators that run on the Pi without X? If not, is there a specifically light-weight window manager that would be good with video game emulator?
8
votes
1answer
2k views

Hard-float and performance

Ever since the official Raspbian image came out, there has been much talking about hard-float - often cited as one of the most prominent Raspbian features, promising "tremendous performance boost". I ...
10
votes
1answer
8k views

Upstart in Debian/Raspbian

I've switched from sysvinit to upstart but get the below message whenever I attempt to start a service: Unable to connect to Upstart: Failed to connect to socket /com/ubuntu/upstart: Connection ...

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