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by GrahamC
Thu Jun 21, 2012 10:56 pm
Forum: Beginners
Topic: Restoring Backup data?
Replies: 13
Views: 2513

Re: Restoring Backup data?

That error message from mount is the generic one it displays on pretty much any error condition. Not sure why you are mounting to /dev/sdc rather than somewhere in /media or /mnt but I doubt if it is getting far enough for that to be the issue. Another command you can try is dumpe2fs pi_4gb_2012_06_...
by GrahamC
Thu Jun 21, 2012 7:08 pm
Forum: Troubleshooting
Topic: Resolution issues on 32 inch HDTV
Replies: 6
Views: 3594

Re: Resolution issues on 32 inch HDTV

It's useful to bookmark http://elinux.org/RPi_config.txt so you always have a reference. Remember there are two commands for showing supported modes on your monitor: /opt/vc/bin/tvservice -m DMT /opt/vc/bin/tvservice -m CEA One of them should show as the "native" mode (I presume this is what it defa...
by GrahamC
Thu Jun 21, 2012 2:10 pm
Forum: Beginners
Topic: Restoring Backup data?
Replies: 13
Views: 2513

Re: Restoring Backup data?

I presume you have tried: sudo mount -o loop -t ext4 FILE MOUNT_POINT where FILE is the name of your backed up file and MOUNT_POINT is the place to mount it at. I believe fsck (or e2fsck) will work on a file as well as a device, so you could try e2fsck -v FILE to verify that the partition backup loo...
by GrahamC
Tue Jun 19, 2012 3:03 pm
Forum: Troubleshooting
Topic: Resolution issues on 32 inch HDTV
Replies: 6
Views: 3594

Re: Resolution issues on 32 inch HDTV

Have you remembered to put:

disable_overscan=1

in your config.txt file ?

Without this your monitor may be interpolating pixels to render the slightly smaller image.
by GrahamC
Mon Jun 18, 2012 11:40 pm
Forum: Beginners
Topic: Remapping the Keyboard
Replies: 19
Views: 41404

Re: Remapping the Keyboard

For anyone trying to use a keyboard that doesn't exactly match one of the standard keyboard layouts I suggest looking at the xmodmap command which allows individual keys to be reassigned. You can use xev to find the keycode that the X subsystem receives (this appears to be 8 greater than the keycode...
by GrahamC
Sun Jun 17, 2012 1:46 pm
Forum: Beginners
Topic: No Internet Access
Replies: 12
Views: 9691

Re: No Internet Access

I believe one of the earlier SD card images had problems with DHCP, are you using the latest image ?

If DHCP won't work try a static IP address (for Debian/Raspbian modify the file /etc/networking/interfaces try 'man interfaces' for the correct syntax for this file).
by GrahamC
Sun Jun 17, 2012 9:31 am
Forum: Beginners
Topic: Useful little unicode to hex shell script
Replies: 0
Views: 622

Useful little unicode to hex shell script

For anyone playing around with keyboard remapping using loadkeys or xmodmap and wanting to find what unicode code is presently assigned to a particular key the following little shell script is useful: echo -n "$1" | recode utf-8..utf-16le | od -An -x This needs the recode package to be installed. Ca...
by GrahamC
Thu Jun 14, 2012 10:48 am
Forum: Troubleshooting
Topic: Strange error message when attaching USB hard disk drive
Replies: 1
Views: 617

Strange error message when attaching USB hard disk drive

When I attach a hard disk drive via the USB port I get error messages like the following every few seconds in the dmesg log: [ 375.378414] usb 1-1.2: new high speed USB device number 4 using dwc_otg [ 375.378567] DEBUG:handle_hc_chhltd_intr_dma:: XactErr without NYET/NAK/ACK This is with Debian and ...
by GrahamC
Mon Jun 11, 2012 9:56 pm
Forum: Debian
Topic: X subsystem gets killed under some loading conditions
Replies: 1
Views: 1218

X subsystem gets killed under some loading conditions

I have noticed that the X subsystem tends to get killed under some loading conditions. Particularly when running transmission (the bit-torrent client) as well as any other application which takes a fair amount of memory such as Midori. With the Debian system and the latest kernel (3.1.9+ #107), when...
by GrahamC
Sat Jun 09, 2012 10:29 pm
Forum: Raspbian
Topic: packages you want to see in raspbian
Replies: 133
Views: 31993

Re: packages you want to see in raspbian

asterisk (I don't know if this is in the Debian repository either yet).
by GrahamC
Fri Jun 08, 2012 2:02 pm
Forum: Raspbian
Topic: Unable to install transmission (bit-torrent client)
Replies: 5
Views: 2607

Unable to install transmission (bit-torrent client)

While trying to install transmission-gtk or transmission-cli I get the error message: The following packages have unmet dependencies: transmission-cli : Depends: transmission-common (= 2.51-2) but it is not going to be installed E: Unable to correct problems, you have held broken packages. It appear...
by GrahamC
Thu May 24, 2012 5:48 pm
Forum: General discussion
Topic: Any word from Farnell?
Replies: 122
Views: 13528

Re: Any word from Farnell?

I have also just received the "your order has been shipped" email. I ordered in the late evening of the 3'rd of March, so it looks like that is where they have reached in the orders queue.
by GrahamC
Tue May 22, 2012 11:44 pm
Forum: Off topic discussion
Topic: Raspberry Pi and the MSP430
Replies: 9
Views: 3926

Re: Raspberry Pi and the MSP430

Those are the two chips my kit came with a couple of months ago.
by GrahamC
Tue May 22, 2012 11:21 pm
Forum: Off topic discussion
Topic: Raspberry Pi and the MSP430
Replies: 9
Views: 3926

Re: Raspberry Pi and the MSP430

A correction to what I wrote on 15-May. One of the chips (MSP430G2553) supplied with the latest TI launchpad kit does have a built in hardware UART so it can go up to 115,200 baud without a problem. The other chip supplied (MSP430G2452) doesn't have the hardware UART so you have to emulate serial I/...
by GrahamC
Tue May 15, 2012 11:45 am
Forum: Off topic discussion
Topic: Raspberry Pi and the MSP430
Replies: 9
Views: 3926

Re: Raspberry Pi and the MSP430

I believe the MSP430 launchpad can only support relatively low baud rates for serial input (using the timer interrupt to sample the data input one bit at a time), anywhere from 2,400 up to 9,600 depending on the MSP430 clock speed used. It might be a little faster to use a pair of GPIO pins on the P...
by GrahamC
Sat May 12, 2012 10:42 pm
Forum: General discussion
Topic: The new forums are here!
Replies: 115
Views: 18382

Re: The new forums are here!

I notice some embedded graphics images in some threads display poorly (stretched horizontally).
For example those in the threads 'Status of SD card compatibility - What should I buy?' and 'SD Card Benchmarks'.

Switching to prosilver theme also makes those images very large.
by GrahamC
Tue May 08, 2012 2:59 pm
Forum: General discussion
Topic: SD card performance testing
Replies: 2
Views: 881

Re: SD card performance testing

<r>For performance comparisons there is a thread entitled 'SD Card Benchmarks' - it is currently down at page 28 as it hasn't been updated for a while. Since they were using a Windows program for the test I'm not sure how useful those figures are. Personally, I quite like using the f3write/f3read te...
by GrahamC
Sun Apr 29, 2012 11:29 am
Forum: General discussion
Topic: SD Card performance in R-Pi onboard slot
Replies: 289
Views: 156078

Re: SD Card performance in R-Pi onboard slot

It does completely fill the card's file system, so I don't know if that will cause a problem when the card is the root file system.
by GrahamC
Sun Apr 29, 2012 11:21 am
Forum: General discussion
Topic: SD Card performance in R-Pi onboard slot
Replies: 289
Views: 156078

Re: SD Card performance in R-Pi onboard slot

<r>For anybody who wants to test their SD card to make sure what is written to it is read back identically this program (F3) is quite useful. It is meant for detecting fake cards (those formatted with a false size) but it also makes a good SD card tester/exerciser. It also displays estimates of the ...
by GrahamC
Fri Apr 27, 2012 11:53 am
Forum: General discussion
Topic: Email from Farnell
Replies: 223
Views: 32163

Re: Email from Farnell

Same for me, w/c 28/05, glad I didn't get up at 6am on launch day just to gain a week or two
by GrahamC
Fri Apr 20, 2012 12:19 am
Forum: General discussion
Topic: Powering raspi from the usb hub that it uses
Replies: 18
Views: 3163

Re: Powering raspi from the usb hub that it uses

Nice photo.

Please ignore what I said in post #17, I was thinking the original poster meant feeding the power in through the USB type A sockets which I see the quick start guide already says not to do.
by GrahamC
Thu Apr 19, 2012 11:45 pm
Forum: General discussion
Topic: Powering raspi from the usb hub that it uses
Replies: 18
Views: 3163

Re: Powering raspi from the usb hub that it uses

I think the schematics show why trying this is not a good idea (power would have to go through fuses F1 and F2 (140 mA each ?).

I suggest everybody makes sure they get a micro USB cable ready for the day their PI arrives.
by GrahamC
Thu Apr 19, 2012 1:12 am
Forum: General discussion
Topic: voltage question
Replies: 7
Views: 1479

Re: voltage question

Many USB cables use 24 AWG wires for the two power conductors (0.0842 ohms/metre) so you are going to lose around 0.17 to 0.2 volts of drop on a 2 metre lead. So a little bit of over voltage is probably quite a good thing anyway.
by GrahamC
Tue Mar 20, 2012 3:40 pm
Forum: General discussion
Topic: Post your estimated arrival dates
Replies: 323
Views: 50827

Re: Post your estimated arrival dates

same email for me, now mid May instead of end of April - I guess everyone is slipped by about half a month because of the manufacturing problem.
by GrahamC
Wed Mar 14, 2012 1:40 pm
Forum: General discussion
Topic: SD Card Benchmarks
Replies: 302
Views: 281628

Re: SD Card Benchmarks

<t>Is there any way to find the manufacturer's part number of a SD card ?<br/> <br/> If I do lsusb -v on a x86 linux system it just tells me the product details of the SD/USB adapter, with no information on the SD card plugged into it.<br/> <br/> Hopefully when people start receiving their Pi they w...

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