Yes, I have, and they still do not work. Only one works, and when I unplug that, the other one begins to work. I have a dual monitor with one attached to each, and one connected to the headphone jack, and one connected to the speaker out.
I too have this problem. Both speakers work. I have ran a 3.5MM speaker wire to them directly from the CPU, but only one at a time works. I can either get the left one operational or the right, but not both. I have disabled the audio coming over the HDMI to the NVIDA card thinking that I can then activate the audio out ports. I ran a 3.5MM cable with a splitter from the CPU to the monitors, but only one works. I then removed the splitter and plugged each speaker cable directly in to the CPU, but to no avail.
How can I/we get both our speakers to work?
What happens if you plug headphones into the laptop's audio jack socket? If the headphones have audio through both channels then I would say the jack is functioning normally and is configured correctly.
Another test would be to attach a music player or some audio source other than the laptop to the monitors and see if music plays okay. (I don't have a monitor with internal speakers and don't know if this test is possible to perform or not.)