The DSM failures,
 klog: HIGH Kernel message: [ 9.231078] ACPI Warning: \_SB_.PCI0.GFX0._DSM: 
Argument #4 type mismatch - Found [Integer], ACPI requires [Package] 
(20130517/nsarguments-95)
 klog: HIGH Kernel message: [ 9.237756] ACPI Warning: \_SB_.PCI0.GFX0._DSM: 
Argument #4 type mismatch - Found [Buffer], ACPI requires [Package] 
(20130517/nsarguments-95)

Seems to the mismatch Argument#4 that the graphic driver invokes the ACPI _DSM 
method,
>From the ACPI spec, the arg3 type should be Package, but graphic driver 
>calling _DSM method with Integer and Buffer, 
So kernel complain about the mismatch the type of arg3.
Fortunately, checking the  Device-Specific Method _DSM that firmware implement, 
the Arg3 doesn't be used on firmware.
So it should not be a problem of these mismatch if there are no any graphic 
functions fail.
            Method (_DSM, 4, Serialized)  // _DSM: Device-Specific Method
            {
                Name (DRET, Buffer (0x04)
                {
                     0x00
                })
                If (LEqual (Arg0, Buffer (0x10)
                        {
                            /* 0000 */   0xE1, 0x75, 0x39, 0x6F, 0x82, 0x7A, 
0x67, 0x4F,
                            /* 0008 */   0x8B, 0x97, 0x15, 0xBE, 0xE0, 0x60, 
0xBE, 0xDF
                        }))
                {
                    If (LEqual (Arg2, Zero))
                    {
                        CreateWordField (DRET, Zero, F0SS)
                        Store (0x02, F0SS)
                        Return (DRET)
                    }

                    If (LEqual (Arg2, One))
                    {
                        If (LEqual (^^PEG0.PEGP.LNKV, 0x03))
                        {
                            Return (Zero)
                        }

                        Return (One)
                    }
                }

                Return (DRET)
            }
        }

** Changed in: linux-lts-saucy (Ubuntu)
       Status: New => Won't Fix

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https://bugs.launchpad.net/bugs/1281966

Title:
  [Dell Inspiron 3421] CRITICAL / HIGH failures found in fwts report

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