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Does the headphone socket work by any chance .. ie. do you get audio through headphones plugged into the mini jack plug socket ?Can you also post the output from:Code: [Select]aplay -l
sudo gedit /etc/default/grub
How do I save the file when I've altered the line please, is it obvious?
QuoteHow do I save the file when I've altered the line please, is it obvious? Yes it's obvious just click "SAVE" at the top of the screenGood luckGraeme
OK, I want to confirm this is an ACPI issue.Open a terminal and run:Code: [Select]sudo gedit /etc/default/grubenter your password when prompted, an hit enter.When gedit opens, look for the line:-GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"and change it toGRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi=off"SAVE the file, and exit gedit.Back in the terminal run:Code: [Select]sudo update-grubNow REBOOT.Is sound now working ?Be Aware, turning off ACPI will likely result in the system fans running flat out all the time .. but rarely it can result in the fans not coming on at all, keep an eye out for the fans not coming on when the laptop gets warm - if this happens, close down the laptop before it gets too hot and let me know.
There's probably no EASY fix for the fans.There is a problem with the BIOS's ACPI function that was probably worked around elsewhere in WindowsWe could dig out the DSDT and experiment with making changes, but if the above scared you this will scare you sh**less (it does me) .. this would also be extremely hit and miss, and mean going through about 8000 lines of hex code.
Yeah, ACPI handles the shutdown procedure too, so disabling it will almost certainly affect shutdown too. I'm not sure if it's possible to have 2 lines in the GRUB boot menu, to select either acpi=off or not. It's a bit early in the morning for me to be recommending changes to your boot loader And yeah, upgrading is probably best covered in a new thread (although I'll be amazed if Mark doesn't write a sticky post about it!)
sudo cat /sys/firmware/acpi/tables/DSDT > dsdt.dat
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