Open Box review - Logitech k400 on Linuxmint

Boxing day got this on sale.  Cheap!

Out of the box works in linuxmint 15.   (2AAs are pre-loaded.  So really out of the box.)

All the parts layout neatly in the box.  Really there's nothing more besides.  (except the user guide)

Kinda expected, some window-specific function keys don't work.  They are simply different shortcuts, which are fine.

All gestures works.  single tap, two-fingle tap, zooming (grip), two-finger swipes...

The power button is sweet - good for extending the battery life.

One little thing:  According to the mechanical diagram drawing class, the top-edge-view should be on top, not to the bottom.  :)

Mac OSX 10.9 Drops Packets - Workaround

Since updated to 10.9 I had problems on network.  Simple ping commands showed that frequently the request timeout.  Netstat showed that outgoing packets dropped to zero for 15 seconds by that time.

A simple workaround before Apple fixes the bug:

on command line, type

$ sudo sysctl -w net.link.ether.inet.arp_unicast_lim=0
net.link.ether.inet.arp_unicast_lim: 5 -> 0

(you can set this also in /etc/sysctl.conf)
This disables the unicast ARP requests.

To query the status after change, type:

$ sysctl  -a | grep net.link.ether.inet.arp_unicast_lim

Let's hope that apple will fix it in the next patch.

{ Updates }
  2014 Apr 6, Ken: OS X 10.9.2 has fixed the problem.
  2014 Apr 22, the problem comes back  :(   the workaround still works, though.

  2014 Sept 22, Ken: Tested 10.9.5 ping 60 sec to google.com no drop packets.

Mac - Steps to Downgrade from OS X 10.9 to originally 10.8

(More accurately reinstall old version OSX)

Reason of downgrade:
i dont like plist caching
and my view client is not working well
although i like the new map real time rendering
10.8.5 seems more stable
thats all i m asking for

Steps:
0. WARNING!  Before continue, please note that all data on the drive will be lost
1. start OSX by holding command-alt-R
2. soon you will see a 4 options menu
3. option 4) erase hard drive - caution: erase the "macitosh hd" drive, not the 2GB "os base" drive.
4.  option 2) reinstall os x - 
file system type use default - no encyption, case in-sensitive  ** case-sensitive is good, but some applications not  supporting it.
5. "come back after a coffee" and redo the os initialization.  done.