I also tried booting with:

acpi_osi=                    [Yes, it ends at the equal sign.]
acpi_osi="Linux"
acpi_osi="!Linux"        [I think this is the default but for the sake of 
completeness.]

None of it worked.

I disassembled the dsdt and found pearls like these:

                    Method (_BQC, 0, NotSerialized)
                    {
                        If (IGDS)
                        {
                            Return (BRTL)
                        }
                        Else
                        {
                            If (LAnd (LEqual (SPSG, One), LEqual (DPMD, One))) 
{}
                            Else
                            {
                            }
                        }
                    }

-- 
resume from suspend doesn't work (powers off instead) for Acer Timeline 3810t
https://bugs.launchpad.net/bugs/405120
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