Hello,
I have a Latitude E7440 and I've been dual booting Ubuntu and Windows for a while now.
A few days ago I installed Windows 8.1 Pro and the drivers for the notebook.
Although the problem that I am experiencing was first noticed after this, I'm not sure it was caused by installing the drivers or Windows 8.1.
The problem is that in Ubuntu my speakers are not working. When I plugin headphones they work. Unplug headphones, and I still have no sound. The interface stays active and is not being muted.
(I did notice that with unplugin the headphones the volume on them became very high quickly, so the volume I heard over the headphones during unplugging was probably the speaker volume setting)
After noticing this issue I went into diagnostics mode via the bootmenu to run the audio check and again. no sound.
While in Windows 8.1 the sound works fine (when the drivers are installed)
When I plug in my headphones the annoying popup comes up and asks me if I have *** headphones or normal ones. ( and headphones work after clicking OK).
When I unplug my headphones the sound comes back to the speakers, expected behaviour.
I have tried:
uninstalling the drivers.
result: No sound on speakers in Windows.. Headphones work
note: I have been using Windows 7 without audio drivers for quiet a while without issues. Because previously when in windows 7 with the drivers installed my headphones did not work after plugin in and clicking OK on the headphone selection dialog.
reinstalling older drivers (REALTEK_ALC3226-HD-AUDIO_A01_66DTV_SETUP_ZPE)
result: system works normal. sound on speakers and headphones.
resetting Bios. by removing the primary battery and the cmos battery.
after putting those back I booted and had to set my settings in setup again because they where gone,(clock boot sequence etc.)
result: issue persists.. still no sound in diagnostics or Ubuntu. Windows still fine.
TLDR: No speaker sound but yes headphones sound in Ubuntu (and win 8.1 w/o drivers). No sound in diagnostics. and normal behaviour in Win8.1 with drivers installed.
I hope that anyone is able to help me and solve this weird issue.
Thanks in advance and kind regards,