[gutsy] Dell E1505n Laptop static noise when A/C plugged in

Bug #162332 reported by Stephen Sandlin on 2007-11-13
Affects Status Importance Assigned to Milestone
linux-source-2.6.22 (Ubuntu)

Bug Description

Constant (low volume) static hum, with increased loudness while moving the mouse, typing, or text appearing in terminal.The problem occurs only when the A/C power cable is plugged in. When running on battery power, the problem completely disappears. If headphones are plugged in, it is much more noticeable, however the static noise will come through both the headphones and normal speakers. Its much more difficult to spot without headphones, but still possible if the area around you is relatively quiet. I have tested numerous linux live-cds, it seems the problem is universal. I also tried it on the Fedora 8 live-cd, thinking the new pulseaudio system might take care of it, but no luck. I have not been able to test Windows to see if its a linux-only issue.

Laptop: Dell Inspiron E1505n (Ubuntu preinstalled)
Soundcard: 82801G (ICH7 Family) High Definition Audio Controller (STAC92xx)

Brian Murray (brian-murray) wrote :

Thank you for taking the time to report this bug and helping to make Ubuntu better. This bug did not have a package associated with it, which is important for ensuring that it gets looked at by the proper developers. You can learn more about finding the right package at https://wiki.ubuntu.com/Bugs/FindRightPackage . I have classified this bug as a bug in linux-source-2.6.22 the kernel for Gutsy.

Stephen Sandlin (sandlst) wrote :

Since the time of posting, I have added a windowsXP partition to my computer, and am currently dual-booting. The problem is present in windows as well, even moreso. Because of this, I am thinking it is more of a hardware configuration problem than a software bug. I plan on testing the dell-specific package upgrades, even though my problem is not listed on the fixes page. Besides this, I plan on trying to contact dell about the problem to see if they can offer me a solution, but I simply do not have the free time right now. I will update as soon as I can.

Stephen Sandlin (sandlst) wrote :

The motherboard of the computer is now fried, and might have been for quite some time (I have not been using it very much over the last two months). This, coupled with the fact that no one else has confirmed this bug even though it has been open for more than 6 months, makes me even more certain the problem was hardware-related; since the warranty on the computer is expired, and I no longer can test the laptop, I'm marking this bug invalid.

Changed in linux-source-2.6.22:
status: New → Invalid
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