Sunday, 30 May 2010

Upgrading Fedora 12 to 13

I'm pleased to report that after problems upgrading from Fedora 10 to 11 and minor issues upgrading Fedora 11 to 12 that I've finally had a no problem upgrade from Fedora 12 to 13 on my home machine.

I have only a very slightly unusual setup in that I've got Fedora running on top of a hardware RAID environment which has caused some issues with preupgrade in the past. Upgrades I have tried on other equipment such as my work laptop have always been flawless and now it seems the issues with RAID installs have gone away too.

So this brings to an end my blog trilogy about upgrading Fedora, short and sweet, it just works! Now onwards to enjoy using a great new distribution that's pushing the boundaries in pretty much every area of Linux usage. Thanks to the Fedora team, Goddard looks fab.

Tuesday, 25 May 2010

Pre-built Joggler Images

It seems everyone buying a Joggler is doing so for their own good reasons with thoughts about how to hack the device to their needs. I include myself in this too, why else write these blog posts? The majority of people aren't so interested in the hacking side of things as simply getting the device to do what they want and that's where using a pre-built, already hacked, operating system image can come in very handy indeed.

The Images
Easily the two most popular images are Ubuntu based although there are Joggler communities for Android, Mer and Meego, all of which are Linux based platforms. I've only tried the first of these but can lend my recommendation to either of

As I said, both are Ubuntu based with the key difference being the first image uses the Ubuntu Netbook Remix (a.k.a UNR, Ubuntu Netbook Edition and UNE) while the second one uses "normal" Ubuntu.  You'd perhaps expect them to be in fierce competition with each other but in good open source spirit quite the opposite is true. Both are produced by nice guys who help each other (and the rest of the community out) by sharing what they do.

There's no sense in me reproducing how to download and use either of these images.  Both come with pretty bullet-proof instructions on what to do.  I would, however, heartily recommend you produce the images from a Linux system having recently helped a friend struggling with downloading the images successfully and finding the right tools to do the job under Windows.

Fair's Fair
From my own investigations and messing around with putting Fedora on the Joggler I can certainly vouch for the amount of time and effort these guys have put into producing such good quality, usable hacks.  So, if you do more than just evaluate these for your own use i.e. you really are using your Joggler with either of these images then do give serious consideration to spending a few quid giving something back to the guys as they ask through a small donation.  I have no idea how much they might stand to make through donation and other revenue such as the Google ads, but it's probably not a huge amount and is definitely well earned.

If you try the images out and there's something you don't like, fine, you don't have to stick with that particular quirk.  There's never going to be a one-size fits all approach so if you don't like, for example, the on screen keyboard, the user interface or something else then feel free to change it.  It's your system once you've downloaded and booted it after all.  There are a lot of, dare I say, complaints on the forums about things not being quite right.  If it's something major then let the guy know who produced the image, it will probably get fixed in their next version.  Also, there's a huge wealth of help and support out there in various places so try looking for someone who's already "been there, done that".

Subject to some of the Joggler Hardware Gotchas it is possible to use these images on devices much bigger and faster than a 4GB USB stick.  I've tried with an 8GB stick and USB hard disks from 80GB through 320GB and even one disk of 1TB.  Simply follow the instructions for either image to write to your larger device as if it were a 4GB stick.  Then use a tool such as gparted (again I recommend Linux simply because it's easy and the tools are readily available) to resize the second partition to be as big as you like.  If you move to a hard disk (rather than USB stick) then you can undo some of the modifications made in the images for efficiency and to try and protect your stick:
  • Change the file system back to ext3 from ext2
  • Add a swap file or swap partition
You can change the file system type from ext2 to ext3 either before or after changing the size of the partition.  Simply boot the image on your Joggler and run the command "tune2fs -j /dev/sda2" then edit the file /etc/fstab to change bit that says ext2 to say ext3, save that file and you're all done.  The reason for making this change is your files will be a little safer in the event of unplanned events such as sudden loss of power.  This was quite rightly turned off for the USB stick images because more data is written to the device and since USB sticks are only capable of being written to a relatively small number of times the trade-off between stick reliability and file system reliability has to be made.

Adding a swap file (if you don't know what this is then have a go at understanding paging)is probably easier in many ways than adding a swap partition and with a recent version of Linux such as the ones used in these images doesn't lead to any loss of performance as might have been expected in older versions of Linux.  Feel free to add a swap partition in gparted though, don't forget to add a line to /etc/fstab to tell Ubuntu to use this partition as swap.  To add a 1GB swap file simple run the command "dd if=/dev/zero of=/swap bs=1M count=1024; swapon /swap" then add a line to /etc/fstab so next time you reboot Ubuntu will use this file for swap space.

You can find a lot more of my information about the Joggler at my Joggler Index post. I also have a list of Joggler Bookmarks.

Friday, 21 May 2010

Joggler Hardware Gotchas

I haven't (so far at least) attempted to modify my Joggler hardware in any way. It is possible to do so in order to, for example, add an internal USB port. If you're interested in this sort of thing then have a look at the Hacking the Hardware section over at the Joggler Wiki. I have spent a reasonable amount of time playing with the hardware now though so here's my list of things to be careful about.

GMA 500
Contrary to Intel's usual position with regards Linux support, the GMA 500 chipset is an absolute abomination.  The basic reason for this is they license some of the technology from elsewhere so are unable to provide the full source code to the community.  This means parts of the drivers for the GMA 500 chipset are binary only, cannot be shipped by any of the Linux distributions, so must be downloaded individually by each user.  This driver is known as IEGD (Intel Embedded Graphics Driver).

There is an open source alternative known as PSB (or the Poulsbo driver).  Support for this in the Linux distributions is patchy at best.  Earlier versions of Ubuntu and Fedora have better support for this driver as it best supports earlier versions of Xorg, namely version 1.6.4 and below.  The PSB driver has very recently been patched to support Xorg 1.7 and later so should soon start to work with Fedora 12 and above and Ubuntu 10.04.  The patch was written by someone in the Mandriva community and has been made available for Fedora 12/13 by a Red Hat employee netbook enthusiast.

I have tried both drivers on Fedora 12.  I was unable to get Adam's PSB driver to work (the akmod failed to compile) but I do have a fully working Fedora 12 graphical system using the IEGD driver.  There will be more about how to get all that going in another blog post soon.

It's a shame the Joggler (and most netbooks) use this chipset.  Before investigating you would think Linux would have superb support for Atom based netbooks given many of them have previously been sold with a Linux pre-install version.  My guess is the lack of support for current distributions is why we don't see new Linux pre-install netbooks any more.  This can only be due to demand though, Intel would support later versions if a vendor was willing to pay for support but the market has to be there in order to make this worthwhile (rant over).

USB power
The power provided by the Joggler's USB port is dodgy (technical term) at best.  In order to support that claim I have tried several different USB hard disks (1 Lenovo, and 2 Freecom disks) and only non-bus-powered ones have worked reliably.  The Joggler simply isn't able to provide enough power to operate these drives, two that I tried span up but didn't get enough power to move the disk heads, the third (a brand new Freecom mobile drive classic 2) does work but occasionally drops out causing the OS to crash.  My recommendation is to provide an external power source if you're connecting much more than a USB stick to your Joggler.

Options then, well you can either mains power your device(s) or power from a USB hub.  Either of these work reliably in my experience (I've tried a mains powered 3½" disk and powered hubs with my 2½" disks) but still there's one more problem.  If your device passes power back into the Joggler itself, it wont boot and you'll end up in the O2 interface.  You'll know if your device is doing this as the Joggler backlight will be lit even if the Joggler is not plugged into the mains! So now you have 2 options again, (1) stop your device passing power back to the Joggler, and (2) butcher a USB cable.

You can stop your device from passing power back to the Joggler (if it is doing so) by buying a decent powered USB hub. I'm using a Plexus hub I bought from eBuyer along with my Freecom disk.  I have tried some cheaper powered hubs but they also passed power back to the host so while allowing me to connect multiple devices didn't solve the problem I was having.

The USB cable butchery option isn't as bad as it sounds.  USB cables have 4 wires in them, white and green for data, black for earth and red for live.  Simply grab the cable you want to connect your device with (whether it's the device itself or a cheaper powered hub which is passing power back to the Joggler), cut part of the outer sheath away (about an inch will do) somewhere along the cable length, find the 4 cables inside (getting through any braiding or foil that might be in your cable depending on how expensive it was), then simply cut the live wire.  Make sure the live ends are not touching each other with some insulation and you can wrap the cable back up again.  That's it, you've now got a Joggler compatible USB cable which wont pass power back to the Joggler but, obviously, wont power your device either.  The Joggler is able to detect you've got a drive as part of the circuit is still there via the ground cable and data will flow as normal along the untouched data cables.

This observation is a real oddity for which I have no explanation (suggestions welcome).  The Joggler will not boot from your USB device if it has 4 primary partitions, don't ask me why, yes it should work, but it just doesn't boot.  Using 3 primary partitions works, up to 2 primary partitions, an extended partition and as many logical partitions as you like also works.  But, give it a device with 4 partitions on and it's game over as far as booting from that device is concerned.

Some people have mentioned to me about not finding the touch screen very user friendly while running Linux. When compared with the O2 interface that's a pretty fair comment as things tend to be a lot smaller on Linux vs O2. There are various tweaks you can make to your desktop depending on your personal preference such as:
  • finding an on-screen keyboard you're happy with (onBoard vs Cellwriter for example)
  • increasing the font size such that all the things you want to touch (click on) are bigger (do this under System->Preferences->Appearance->Fonts in Gnome)
  • installing touch screen addons for your programs (such as chromeTouch for Chrome)
  • Make your scrollbars wider
If you've decided the touch screen really isn't for you then look into getting a keyboard/mouse solution or a stylus. For keyboards/mice you'll need a USB hub so you're able to attach more than one device to your joggler. I have and can recommend a wireless BTC keyboard with built in joystick (for mouse control) which uses a radio signal via a USB receiver. You can use any USB keyboard/mouse you like though but I'd recommend something compact and wireless, there's always Bluetooth too for which you can get some pretty tiny receivers these days. If you go for the stylus option there's plenty of commercial solutions out there for capacitive touch screens. I quite like this DIY Stylus as an option, however.

You can find a lot more of my information about the Joggler at my Joggler Index post. I also have a list of Joggler Bookmarks.

Thursday, 20 May 2010

Getting a Joggler, the how and the why?

Buying a Joggler is pretty simple, you can just go to the O2 shop and get one for one hundred of our UK pounds, or fifty if it's on sale.  The reason for putting "the how" in this isn't to teach you how to buy stuff on the net.  No no, more to say you can get it for less than fifty quid if you're careful!  Those of us who work for IBM have been buying them through a money saving web site we have access to as IBMers such that you buy the Joggler and a PAYG Mobile Internet USB dongle (which you're not obliged to use) for a total of £60 and get £25 cashback for doing so.  That's £35 for a Joggler and mobile Internet, bargain!  I would think this sort of offer must be out there in the wider world too if you look carefully enough.

So why do I, or you for that matter, want one?  There's lots of different uses for it.  Even if you look at it as a dumb wireless digital photo frame then it's far cheaper than other wifi frames out there.  The neat thing about it is it runs a version of Linux internally, has a USB port and is also capable of booting from USB.  This means you can run pretty much anything you like on there instead of the default O2 interface.  So, it's the ideal hacking toy and can become a fully fledged computer system disguised as a photo frame if you choose to do so.  The sky is the limit.

For me, I use it as a low power home server running:
  • remote login to home (ssh)
  • music streaming (squeezebox server)
  • internet connected photo frame (gphotoframe)
  • trivial internet browsing (chrome + touchscreen addon)
  • file server (nfs, http, ftp, smb, etc as required)
  • backup server (rsync) 

I've also found it very useful to have a computer connected to my printer for wifi print serving from my laptop in the past.  Currently the Joggler isn't located next to my printer so I'm not doing this but it's definitely an option for the future.  Similarly I may eventually reconnect my current cost meter for home power monitoring, sending daily electricity bill via email, graphing and storing stats.  Another use I could put it to is as a WOL client so wake up other machines in the house remotely so I don't leave them powered on all day (not that I do this anyway), but I haven't configured WOL yet.

Not investigated yet but it seems to me it should be possible to run the OpenPeak apps on Linux too.  These are just flash applications so I should be able to run them on the Linux desktop without any issues which would provide me with the same functionality I would get from the original O2 interface under my own Linux.

You can find a lot more of my information about the Joggler at my Joggler Index post. I also have a list of Joggler Bookmarks.

Wednesday, 19 May 2010

Joggler Index

This post will be kept up to date serving as an ordered index to my notes about the O2 Joggler; essentially a glorified digital picture frame with a touch screen.  All posts will use the joggler tag too but these may appear in any order.

The very brief tech spec is:
  • Intel Atom Z520 with GMA 500 chipset
  • 512MB RAM
  • 1GB Internal Storage (to run the O2 operating system and interface)
  • 7 inch touch screen
  • USB port, audio jack, wired Ethernet and wireless network
I have a list of Joggler bookmarks.