Recently I spent 40 minutes on the phone dealing with my Aunt’s laptop, which had mysteriously stopped getting on their household WiFi Network. My mother also had a problem with her laptop’s touchpad–it had stopped working, and she could only use the laptop with a USB mouse attached. What did both of these problems have in common?
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Friday morning I got into the family car (1998 VW Passat with manual transmission) and, depressing the clutch, started the engine. The car rocked backwards (I normally leave the gearshift in reverse when parked, plus the parking break was on), the engine died, and the clutch petal stayed on the floor (not good!). The clutch petal had lost all resistance, so I couldn’t shift the car. Looking under the hood, I found that a hose leading from the brake fluid reservoir had popped off and sprayed brake fluid around. I connected it back to the reservoir, and started the engine in Neutral, but the clutch didn’t magically start working. (Sigh…I like easy solutions.) Twenty Dollar bike to the rescue!
Back in January the power adapter failed for my Silicon Dust HD HomeRun (a network HTDV tuning device).
They replaced my power supply and claimed that they were seeing only a 1% failure rate. As late as March 28th they were sticking to the "less than a percent" figure. Eventually on June 3rd they posted an offer to replace all SW20-S050-15 power adapters. Unfortunately for me, they did not send an email to all customers, so I did not find out about this until my power adapter failed (today) and I went to submit a trouble ticket and saw the notice. I guess that "1%" were causing them a lot of problems…
I've been very happy with the HD HomeRun unit itself, but once again, the el-cheapo power adapter is my weakest link and is keeping me from watching TV until the replacement arrives (and since it happend on a Friday, I'm probably without TV until next Wednesday at least).
So, if you have a HD HomeRun with one of the older adapters, head on over to the replacement page and order a replacement before yours dies. (So far the forums haven't listed any fires started by the failing power adapters, just dimples of melted plastic on the side due to the failure, so hopefully they are not dangerous.)
My iRobot Roomba 4150 started to exhibit a behavior that I hadn't seen before. After starting up, the robot would "wiggle" as it went forward for a few feet, then turn, then move forward a few more feet while wiggling. After a few turns, it would stop and issue a double "uh-oh" sound. After cleaning and removing the vacuum brushes, the behavior was still hapening, so I decided it must be a problem with the sensors or motors on the robot. The robot's wheels would still turn manually, and they would pop up and down into the body as normal. I tried cleaning the clif sensors and that didn't fix the problem. Finally, I blew compressed air into the drive wheel compartment and that fixed the problem. Aparently, the rotary encoders on one of the wheels had gotten jamed up with dirt.
The iRobot website did mention an OSMO update that is supposed to fix this issue, but according to the serial number on my roomba, it had already received the update. I guess removing the debris from the wheel is the better solution.
I refilled the Li-ion cells in my laptop battery about 18 months ago.The battery has worked as expected since then. The only "special" treatment this battery gets is that it travels in my laptop (as opposed to being the extra battery in my backpack) when traveling through TSA security checkpoints. (I figure it's better the have the battery with the fully applied IBM label sticker visible in the backpack, and the battery where I pulled off the label sticker to dissasemble it safely integrated with the laptop.)
Over the last 18 months, the battery capacity has reduced itself to 44% of the original value (This happens with LiIon cells as they age). My last full capacity ACPI reading is now 21060 mWh, and provides 1-2 hours of working time on my IBM X31 Thinkpad. In a few more months it will be time to replace the Li-Ion cells again. Luckly, a friend gave me an IBM T60 extended battery (containing 8 cells) that had failed. When I took it appart, it appeared that 6 of the cells worked fine, and two of the cells were dead (killing the entire battery). TaDa! 6 free replacement cells!
A system downtime announcement I received today (slightly anatomized to protect the guilty):
Summary:
On Tuesday, July 1, 2008, at approximately 6:30 PM, the XXXX XXXXXXX server instance, which monitors the availability of XXXX servers and network devices, went offline. This outage was not noticed until Monday, July 7, 2008. After discovering the outage, the server was brought back online and was again monitoring services at 6:00 PM on July 7.
If you have any questions, please contact the XXXX Help Desk (XXXXXXXXXXXX). Thank you.
I purchased a north American version of the Motofone F3 (Manufactured in Brazil), which operates on the 850/1900 Mhz GSM bands (used almost exclusively in North America) for $34 including S/H from dakmart.com. After plugging my SIM card in the phone it reported that it was on the AT-T network. My original Motofone F3 from India worked only on the 900/1800 bands, and wouldn't work on the AT&T network (or any other North American network).
Compressive Sampling is a new field of sensing theory that sidesteps the traditional Nyquist sampling limit. The Nyquist limit is an information theory result that says to perfectly capture a signal which is bandwidth limited at a certain frequency, X, you must take 2 times X samples per second. So for example, if you want to perfectly detect a 20Hz sine wave, you must take 40 samples a second. To perfectly represent audio that humans can hear (typically understood to be sounds in the 20-20,000Hz range) we must use 40,000 samples per second (40kHz). CD audio uses 44.1kHz, and professional audio systems typically sample at 48kHz a second. [Note that the number of samples per second has nothing to do with the quantization, or accuracy of the samples, so audio that is sampled at 20 bits per sample has more information (and less noise) than audio sampled at 16 bits per sample.] Continue reading
My encrypted home directory worked well with 8.04, I only had to make one change caused by the new xml format of the pam_mount.conf.xml file as follows:
<volume user="summetj" fstype="crypt" path="/dev/sda6" mountpoint="/home/summetj" options="cipher=aes" fskeycipher="aes-256-ecb" fskeypath="/home/summetj.key" />
After I installed 8.04 from scratch I had to mount the directory and chown the files to the new user.
I have used Myth to rip a large number of my DVD's to AVI files (using either the Excellent or Good setting). Now that I am starting to play back the movies, I have found something that is very troubling.
On many of the movies, the first 95% of the movie (e.g. 1:13 min of a 1:26 movie) plays flawlessly. However, near the end of the movie, the audio and video starts to speed up and get jerky. (Audio/video sync is also thrown off.) Continue reading