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Dietrich Schroff

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Dr. Dietrich Schroffhttps://plus.google.com/101232877473830670008noreply@blogger.comBlogger277125
Updated: 3 weeks 1 day ago

Ubuntu upgrade to 12.04: grub timeout does not work anymore

Sun, 2014-03-30 13:11
After doing the upgrade and solving some issues with my screen-resolution, another grub problem hit me:
The timeout for booting the standard kernel did not work anymore.
Inside /etc/default/grub
GRUB_TIMEOUT=10and update-grub, grub worked like
 GRUB_TIMEOUT=-1If you need a  good manual  just look here, but this does not help me, too.

After some tries, i did the following:

In /boot/grub/grub.cfg i changed from
terminal_output gfxterm
if [ "${recordfail}" = 1 ] ; then
  set timeout=-1
else
  if [ x$feature_timeout_style = xy ] ; then
    set timeout_style=menu
    set timeout=10
  fi
fito
terminal_output gfxterm
recordfail=0
if [ "${recordfail}" = 1 ] ; then
  set timeout=-1
else
  if [ x$feature_timeout_style = xy ] ; then
    set timeout_style=menu
    set timeout=10
  fi
fiThis works, but i have to redo the change everytime update-grub is used...

Ubuntu upgrade to 12.04: screen only works with 1024x768

Sun, 2014-03-30 12:57
After upgrading a laptop-system to 12.04 (precise pangolin) X only starts with a resolution of 1024x768 and not with 1366x768.
I followed many postings and tried many things:
  • add new resolution with xrandr (here)
  • create a xorg.conf file (here)
  • add new drivers (here)
  • ...
But there was only one thing wrong: /etc/default/grub

After changing the following line everything worked:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash i915.modeset=0 to
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"(i added i915.modeset=0  because with the older ubuntu version hibernate does not work and this configuration fixed it. [link])

Telegram on two devices...

Tue, 2014-02-25 14:32
After trying Whatsapp on 2 devices without success, i tried the same thing with telegram. Telegram says about multiple devices:


So let's see...
Registering the mobile phone was straight forward: a SMS with a verification code and that's it.Registering was easy: just another SMSAnd after entering the code on the tablet i got the following message on my mobile phone:
After that every conversation or more precise: every unsecure conversation is broadcasted to all of your devices. That means, you can switch over from phone to tablet without loosing your context... really cool!




Smart Meter@Home: Fritz!Powerline 546E - really smart?

Tue, 2014-02-18 14:15
Everyone is talking about Smart Meter - is it possible to get in touch with this topic by buying a Fritz!Powerline 546E?

The key points of Smart Meters according to wikipedia are:
  • real-time or near real-time sensors
  • power outage notification
  • power quality monitoring 
  • collect, and analyze energy usage
What is supported by the 546E?
  • power outage notification: no way without a battery ;-)
  • real-time or near real-time sensors: one measurement per minute
  • power quality monitoring: voltage monitoring
  • collect and analyze: 


 and But there are some shortcomings:
  • graphs and data only local on 546E, no integration to any central server, not even to a Fritz!Box (because of a missing DECT interface)
  • configuration as WLAN repeater not described in the manual (only powerline)
  • export via web frontend limited to 5 minute-intervals only 24 hours
  • automated export only via E-Mail and limited to this:

 

Whatsapp on 2 devices: "does not work, tell why!"

Tue, 2014-01-28 13:58
After nearly everyone of my friends is using whatsapp, it was overdue to download this app.
Why is this app used by everyone? What's cool about this app?
  • You have to do nothing after the download except this sms-verification
  • No account creation
  • No new password (or reuse another one <- li="" nooo="">
  • No need for searching addresses
  • You do not have to take care about your contact list
  • Just start messaging
Why does this work? Whatsapp uses your phonenumber to build the account identifier. The app scans your phone address book and builds its own contact list. Fine.

Really?

Not at all: If you want to add whatsapp on a second device with no sim card (e.g. your tablet), you can find several instructions but: after adding whatsapp to this device, whatsapp on your phone does no longer work...
Whatapps says:
Your WhatsApp account can only be verified with one number, on one device.
If you attempt to frequently switch your WhatsApp account between different devices, at a certain point, you may be blocked from re-verifying your account. So please do not repeatedly switch between different devices.
Cheers,
WhatsApp Support TeamFinally i would say: The biggest advantage is also the biggest disadvantage. Using the phonenumber as account id makes everything easy but prevents the usage of more than one device....

Android Update: 4.4.2

Sat, 2013-12-14 04:16
Only two week after upgrading to Android 4.4 the next update was available:
   And like all other minor upgrades: no information about the updates....  If you compare the information you notice the kernel upgrade from 3.1.10-gee1a0b2 to 3.1.10-g4776c86.For a complete history of all updates visit this posting.