View Full Version : [ubuntu] Acer 5742-6874 Only One Speaker Working (Oneiric)

November 2nd, 2011, 03:14 AM
Hello everyone. I've recently installed Oneiric on an Acer 5742-6874, and only the left speaker is working—the right on-board speaker is not producing sound.

Both left and right speakers work when I have it set to HDMI out and run it through my TV; ditto my computer monitor. Also, both left and right headphones work when I have a set plugged in.
Finally, just before installing Ubuntu, the on-board speakers worked in Windows 7.
How do I go about diagnosing why the right speaker isn't working? More importantly, how do I fix it?
Specs for machine:

Processor TypeIntel Core i3-370M
Processor Cores2
Processor Speed2.4 GHz
Processor Cache3 MB L3
Storage & Memory

Hard Drive Capacity750 GB
Hard Drive Speed (Revolutions Per Minute)5400 rpm
RAM Size6 GB
RAM Speed1066 MHz
RAM Slots2 (0 Available)
Optical Drive8X Super Multi Double-Layer DVD
Built-in Memory Card ReaderYes
Memory Card Reader - Compatible Memory TypeSD; MMC

Graphics ChipsetIntel HD Graphics
Video Memory ConfigurationIntegrated
Dedicated Video Memory SizeNot Applicable
Wireless Display (WiDi) CapableNo

Speaker Wattage2 Watts
Integrated MicrophoneYes
Microphone InputYes
Digital Audio OutputNo
Hardware Volume ControlNo

November 2nd, 2011, 01:46 PM
Okay, I've researched a little further and discovered that the laptop only has an integrated mono speaker (which is weird). See here (https://support.acer.com/acerpanam/notebook/2010/Acer/Aspire/Aspire5742/Aspire5742sp2.shtml)or here (http://laptops-specs.blogspot.com/2010/09/acer-aspire-5742-specifications.html).
My question now is, is there a way to make a dual-channel signal (YouTube, music from banshee, etc.) come out of a mono system? Particularly without screwing up my HDMI out and headphones—which are both stereo?