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Re: Running Linux on Samsung's ARM Chromebook
by Tim Serong 14 Mar '14

14 Mar '14

On 19/02/14 12:00, toby(a)dryft.net wrote: > > Hi, > Samsung have had an ARM-based laptop for a while, sold as a Chromebook. > (ie. with an Android-like Linux kernel and the Chrome browser as the whole OS) > > The little ARM cpu means the laptop doesn't need much power and can > run for quite a while, despite being lightweight and cheap with a > small battery. > > I was wondering how it'd go running a full version of Linux; just > running a bunch of terminal emulators more of the time, and maybe > Chromium from time to time. > > I've heard of people managing to get Ubuntu or other linux variants > installed, but I wondered if anyone here has done it? Was it worth the > trouble? I've run openSUSE on mine as described here: http://en.opensuse.org/HCL:ARMChromebook There's an image you can put on an SD card, then with the Chomebook in developer mode[1], you boot off the SD card (have to hit CTRL-U at each boot to do this). This means you can have a play without trashing or otherwise repartitioning the SSD. Last time I tried this, *something* didn't work (might have been not waking from screensaver? I forget exactly), and I never got around to figuring out what it was. This may well have since been fixed. I ultimately ended up just running my Chromebook in regular ChromeOS mode, as I'm really only using the thing occasionally as a a slightly glorified web browser, and I got sick of it whining loudly at me on every boot about the possible doom associated with being in developer mode. HTH, Tim [1] http://www.chromium.org/chromium-os/developer-information-for-chrome-os-dev…

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unexpected tcp behaviour
by James Harper 10 Mar '14

10 Mar '14

I have an application under Linux that talks to a windows machine. Previously I'd assemble each packet into a big buffer and write it out, eg: write(sock, buffer, length); But a recent change meant I am now writing out the header separately, eg: write(sock, header, header_length); write(sock, buffer, length); The packets are sent separately, but it's TCP and the reassembled stream at the Windows end is identical, but the windows end now gives an error. I changed it to: send(sock, header, header_length, MSG_MORE); write(sock, buffer, length); And it works again (and is better for network efficiency reasons), but it was something I didn't expect and I wasted a bit of time comparing packet traces... Am I right in thinking that this is a bug in the windows application and that it does read() instead of recv(..., MSG_WAITALL) (or whatever the winsock equivalent is), and doesn't handle when the read is less than expected, or is there something I'm not getting? If it matters, the windows application is SQL Server Management Studio. My application translates between TDS and postgres. Thanks James

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mythtv and retune
by James Harper 07 Mar '14

07 Mar '14

Since the au retune I haven't been able to get mythtv to tune to channels 9 or 10 on boot. If I shut down mythtv and manually run a w_scan then restart mythtv it works (without touching anything in mythtv), so I'm guessing my card is failing to automatically detect one of the various dvb-t parameters that must have changed, but w_scan is figuring it out... Does anyone know exactly what the retune changed? All the frequencies appear to be the same... Thanks James

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Wifi weirdness
by stripes theotoky 05 Mar '14

05 Mar '14

Does any have an idea why I can connect the the work Wifi with Windows and Ipad but Linux will not establish a connection. It seems to be perfectly normal with WPA2 encryption. I don't know where to look to solve this one there is nothing wrong with the Wifi on the computer it connects just fine at home or at friends. Stripes.

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recommendation for a good NBN router
by cory seligman 05 Mar '14

05 Mar '14

I'll be getting my NBN connected in a few weeks and it seems like a good time to retire my old WRT54G routers. Does anyone have a suggestion for a router that is: cheap reliable 802.11n dual band easy to put OpenWRT on Also, does anyone have any good advice about getting OpenWRT working with the NBN? Maybe it's trivial - I don't know... thanks, Cory

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CUPS forbidding me access to web interface
by Tim Lyth 04 Mar '14

04 Mar '14

Hi all, I'm trying to set up CUPS on a Debian Sid system. I have the latest CUPS available via apt-get (1.7.1-6). When I try to browse to the web interface (http://192.168.1.4:631 and https://192.168.1.4:631) I'm getting a HTTP 403 Forbidden error. I am having trouble finding anything which explain how to fix this. Everything I've found so far seems to assume that the web interface will "just work". The server running CUPS has no GUI, so I can't test to see if the web interface works there or not. The changes to the default Debian configuration file: LogLevel debug #Listen localhost:631 #Listen /var/run/cups/cups.sock Port 631 #<Location /admin> # Order allow,deny #</Location> Any assistance will be greatly appreciated. Regards, Tim Lyth

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Reducing a video in file size
by Carl Turney 26 Feb '14

26 Feb '14

Hi All, I've got a 3.9 GB video file that I want to reduce significantly in size. I noticed the Nautilus >> Properties >> Audio/Video Properties on this file said the resolution was 1920 by 1080. So I searched the web and found the suggestion to use mencoder -- which was already installed in my system. Set the resolution to 960 x 540 and expected an output file of a bit more than 1/4 of the original file size. Quite surprised to see that the output increased in size to 4.8 GB! Any hints on how I can resize the resulting file down to about a quarter of the original? I've got AVIDemux, GStreamer plugins and codecs, movieplayer, smplayer, pitivi, transmageddon, VLC media player, and apparently mencoder. Thanks a lot, Carl Bayswater Here's the command I gave: > mencoder TWYDS1.mkv -vf scale=960:540 -oac pcm -ovc copy -o TWYDS2.mkv Here's the resulting output: > MEncoder SVN-r1.0~rc3+svn20090426-4.4.3 (C) 2000-2009 MPlayer Team > > WARNING: OUTPUT FILE FORMAT IS _AVI_. See -of help. > success: format: 0 data: 0x0 - 0xf6de8583 > [mkv] Track ID 1: video (V_MPEG4/ISO/AVC), -vid 0 > [mkv] Track ID 2: audio (A_AAC), -aid 0, -alang eng > [mkv] Will play video track 1. > Matroska file format detected. > VIDEO: [avc1] 1920x1080 24bpp 25.000 fps 0.0 kbps ( 0.0 kbyte/s) > [V] filefmt:31 fourcc:0x31637661 size:1920x1080 fps:25.000 ftime:=0.0400 > ========================================================================== > Opening audio decoder: [faad] AAC (MPEG2/4 Advanced Audio Coding) > FAAD: compressed input bitrate missing, assuming 128kbit/s! > AUDIO: 48000 Hz, 2 ch, s16le, 128.0 kbit/8.33% (ratio: 16000->192000) > Selected audio codec: [faad] afm: faad (FAAD AAC (MPEG-2/MPEG-4 Audio)) > ========================================================================== > videocodec: framecopy (1920x1080 24bpp fourcc=31637661) > Writing header... > ODML: Aspect information not (yet?) available or unspecified, not writing vprp header. > Writing header... > ODML: Aspect information not (yet?) available or unspecified, not writing vprp header. > Pos: 1.4s 35f ( 0%) 0.00fps Trem: 0min 0mb A-V:0.080 [152:1536] > Skipping frame! > ODML: Starting new RIFF chunk at 1023MB.: 3min 4834mb A-V:0.042 [6154:1536]] > ODML: Starting new RIFF chunk at 2047MB.: 2min 4881mb A-V:0.043 [5848:1536] > Pos:3390.6s 84765f (61%) 462.47fps Trem: 1min 4871mb A-V:0.080 [5901:1536] > Skipping frame! > ODML: Starting new RIFF chunk at 3071MB.: 1min 4870mb A-V:0.043 [5913:1536] > ODML: Starting new RIFF chunk at 4095MB.: 0min 4899mb A-V:0.028 [5732:1536] > Writing index...97f (99%) 474.61fps Trem: 0min 4925mb A-V:0.024 [5575:1536] > Writing header... > ODML: Aspect information not (yet?) available or unspecified, not writing vprp header. > > Video stream: 5575.664 kbit/s (696957 B/s) size: 4047792233 bytes 5807.800 secs 145197 frames > > Audio stream: 1536.000 kbit/s (192000 B/s) size: 1114841088 bytes 5806.464 secs

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Running Linux on Samsung's ARM Chromebook
by Toby Corkindale 20 Feb '14

20 Feb '14

Hi, Samsung have had an ARM-based laptop for a while, sold as a Chromebook. (ie. with an Android-like Linux kernel and the Chrome browser as the whole OS) The little ARM cpu means the laptop doesn't need much power and can run for quite a while, despite being lightweight and cheap with a small battery. I was wondering how it'd go running a full version of Linux; just running a bunch of terminal emulators more of the time, and maybe Chromium from time to time. I've heard of people managing to get Ubuntu or other linux variants installed, but I wondered if anyone here has done it? Was it worth the trouble? Cheers, Toby -- Turning and turning in the widening gyre The falcon cannot hear the falconer Things fall apart; the center cannot hold Mere anarchy is loosed upon the world

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Minimal but useful Linux userland, COW filesystems footprint
by Petros 18 Feb '14

18 Feb '14

Hi, I want to try Linux Containers (LVC 1.0 is out) and BTRFS (in a way I use FreeBSD and Jails and ZFS). I want to use filesystem cloning (at the moment under FreeBSD "cd /usr/src; make buildworld; make distribution; zfs snapshot; zfs clone") I also want to have a small but useful userland.. I am thinking of a "minimalist" Debian installation but other ideas are welcome too. Do you have good advice to achieve this? (TW: I am not a huge Busybox fan, the tools always seem to miss the one option I want to use.. so, no scaled down tools, just a good set of "standard tools") I do not know about the memory footstep and minimal requirements of BTRFS and ZFS under Linux, comments and advice is welcome as well. Thanks Peter

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ARM motherboard suggestions
by Russell Coker 18 Feb '14

18 Feb '14

A client is looking for a new embedded system. Their current systems have a 500MHz AMD Geode CPU (which provides a lot more power than they need). A randomly selected system has the following output of "free". So any of the bigger embedded systems (which seem to have 256M+) will do, but the small ones with 32M will be out of the question and even 64M probably won't do. total used free shared buffers cached Mem: 997864 46248 951616 0 7284 21388 -/+ buffers/cache: 17576 980288 Swap: 0 0 0 I'd like to run a fairly stock Debian installation. I guess that a system with 32M of storage would do if I configured it to use a micro-SD card for main storage. The device would need to support at least 2G of storage, preferrably 8G or 16G. Digital IO ports are required as well as a serial port. I guess it's possible to use DTR/DSR and RTS/CTS on a second serial port if a board does everything else right, only 2 digital outputs are needed. The current systems have 2 ethernet ports, 1 for Internet access and 1 for debugging, we could survive with only 1 port if everything else is good. The device needs to be designed for high temperatures, 70C operating temperature will do. Basically it would be pretty ideal if I could get something like a Samsung Galaxy S that's rated for 70C and has at least 1 Ethernet port, USB, and digital IO. Any suggestions? -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/

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