record new post and updates

source/_posts/2014-11-22-debian-jessie-on-dell-precision-m4800.markdown

@@ -43,3 +43,13 @@ Support for smart-card reader
 -----------------------------
 
 `apt-get install pcscd`
+
+Network
+-------
+
+Disable [IPv6 Privacy Extensions](https://home.regit.org/2011/04/ipv6-privacy/)
+```plain /etc/sysctl.conf
+# Disable IPv6 "Privacy extensions" (random SLAAC addresses)
+net.ipv6.conf.all.use_tempaddr=0
+net.ipv6.conf.default.use_tempaddr=0 
+```

source/_posts/2015-02-18-upgrading-to-freebsd-10-1-release.markdown

@@ -48,6 +48,9 @@ It is a real shame that users essentially have no choice but
 switching from the default syscons to the "new" (unfinished,
 far from functionally complete) vt console driver.
 
+The X mouse cursor occasionnally disappears for some unidentified
+reason. Alt-Tab brings it back.
+
 DRI
 ---
 

source/_posts/2015-03-05-bizarre-packet-filtering-on-ovh-kimsufi-server.markdown

@@ -68,6 +68,12 @@ and all analysis elements in my possession have been conveyed to them,
 to no avail so far: the machine has been essentially unusable for the
 past two months and counting.
 
+**Update 2015-03-20** OVH say they identified a problem and are working on
+a fix. No more SSH failure observed since 2015-03-18 in the afternoon,
+so apparently the fix did work. Still waiting for a post-mortem explanation
+as to what went wrong, and why it took them so long to ackonwledge,
+investigate, and resolve the problem.
+
 Acknowledgements
 ================
 

source/_posts/2015-03-12-gphoto-fails-to-connect-to-canon-eos-20d.markdown

@@ -0,0 +1,39 @@
+---
+layout: post
+title: "GPhoto2 fails to connect to Canon EOS 20D"
+date: 2015-03-12 18:43:21 +0100
+comments: true
+categories: 
+---
+
+For the past few months, [Digikam](https://www.digikam.org/)
+(and the underlying [GPhoto2](http://gphoto.sourceforge.net/) library)
+failed to connect to my Canon EOS 20D camera:
+
+```
+canon/canon/usb.c           (2): Initializing the (USB) camera.
+canon/canon/usb.c           (2): canon_usb_camera_init()
+canon/canon/usb.c           (2): canon_usb_identify: USB ID match 0x04a9:0x30eb (model name "Canon:EOS 20D (normal mode)")
+gp_context_status           (2): Detected a 'Canon:EOS 20D (normal mode)'.
+Detected a 'Canon:EOS 20D (normal mode)'.
+gp_port_usb_msg_read        (3): Reading message (request=0xc value=0x55 index=0x0 size=1=0x1)...
+gp_port_usb_msg_read        (3): Read 0 = 0x0 out of 1 bytes USB message (request=0xc value=0x55 index=0x0 size=1=0x1) (empty hexdump of empty buffer)
+gp_context_error            (0): Could not establish initial contact with camera
+
+*** Error ***              
+Could not establish initial contact with camera
+gp_port_close               (2): Closing port...
+gp_context_error            (0): An error occurred in the io-library ('Unknown error'): No error description available
+```
+
+Upgrading various components of my system did not help, so I ended up
+suspecting a possible issue with the USB stack, which prompted a
+[major OS upgrade]({% post_url 2015-02-18-upgrading-to-freebsd-10-1-release %})
+from which I am still slowly recovering.
+
+It turned out that the upgrade did not help. Further investigation and
+debugging finally allowed me to zero in on the cause of the problem,
+which turned out to be a bug in libgphoto2... which coincidentally
+got  [fixed](http://sourceforge.net/p/gphoto/code/15384/)
+hours before I identified it on my own.
+