[Guide] How to patch DSDT for working battery status

RehabMan · Apr 22, 2015

harryw said:
I'm in a similar position on a Dell E6420. Have instrumented using ACPI Debug and it reaches "Entering EISC" but never outputs "Acquired ECSX".

Code:

Method (EISC, 3, NotSerialized) { \RMDT.PUSH ("Entering EISC") Acquire (ECSX, 0xFFFF) \RMDT.PUSH ("Acquired ECSX")

Is Acquire known to be problematic!?

Thanks, Harry.

If ECSX is declared with a non-zero SyncLevel... yes.

harryw · Apr 22, 2015

sorry, you had mentioned that in your very first post. Applied the patch and could narrow down further:

Code:

 Method (SNVC, 1, NotSerialized)
        {
            \RMDT.PUSH ("Entering SNVC")
            OperationRegion (WWPR, SystemMemory, SMIB, 0x04)
            Field (WWPR, DWordAcc, Lock, Preserve)
            {
                SCDW,   32
            }


            Store (Arg0, SCDW)
            \RMDT.PUSH ("Exiting SNVC")
        }

It's entering SNVC but never exiting. Is my assumption correct that this 4-byte access has to be patched along the same lines as the other patches?

Thanks, Harry.

RehabMan · Apr 22, 2015

harryw said:
sorry, you had mentioned that in your very first post. Applied the patch and could narrow down further:

Code:

Method (SNVC, 1, NotSerialized) { \RMDT.PUSH ("Entering SNVC") OperationRegion (WWPR, SystemMemory, SMIB, 0x04) Field (WWPR, DWordAcc, Lock, Preserve) { SCDW, 32 } Store (Arg0, SCDW) \RMDT.PUSH ("Exiting SNVC") }

It's entering SNVC but never exiting. Is my assumption correct that this 4-byte access has to be patched along the same lines as the other patches?

Thanks, Harry.

Check into SMIB. SystemMemory fields do not need patching.

harryw · Apr 23, 2015

The patched DSDT shows a value of 0xCAF67000 but ACPIDebug shows {"SMIB =", 0x0, }. How would you diagnose this situation further?

Thanks, Harry.

Code:

    Scope (\)
    {
        Mutex (SMIX, 0x00)
        Name (SMIB, 0xCAF67000)
        Name (PSMI, 0xB2)
        Method (SNVC, 1, NotSerialized)
        {
            \RMDT.PUSH ("Entering SNVC")
            \RMDT.P2 ("SMIB = ", SMIB)
            OperationRegion (WWPR, SystemMemory, SMIB, 0x04)
            \RMDT.PUSH ("OperationRegion WWPR defined")
            Field (WWPR, DWordAcc, Lock, Preserve)
            {
                SCDW,   32
            }


            \RMDT.P2 ("Current value of SCDW =", SCDW)
            \RMDT.P2 ("Storing Arg0 in SCDW ", Arg0)
            Store (Arg0, SCDW)
            \RMDT.PUSH ("Exiting SNVC")
        }

RehabMan · Apr 23, 2015

harryw said:

The patched DSDT shows a value of 0xCAF67000 but ACPIDebug shows {"SMIB =", 0x0, }. How would you diagnose this situation further?

Thanks, Harry.

Code:

    Scope (\)
    {
        Mutex (SMIX, 0x00)
        Name (SMIB, 0xCAF67000)
        Name (PSMI, 0xB2)
        Method (SNVC, 1, NotSerialized)
        {
            \RMDT.PUSH ("Entering SNVC")
            \RMDT.P2 ("SMIB = ", SMIB)
            OperationRegion (WWPR, SystemMemory, SMIB, 0x04)
            \RMDT.PUSH ("OperationRegion WWPR defined")
            Field (WWPR, DWordAcc, Lock, Preserve)
            {
                SCDW,   32
            }


            \RMDT.P2 ("Current value of SCDW =", SCDW)
            \RMDT.P2 ("Storing Arg0 in SCDW ", Arg0)
            Store (Arg0, SCDW)
            \RMDT.PUSH ("Exiting SNVC")
        }

Something must have set SMIB to Zero. Any Name is read-write, so it can be the target of a Store.

iamjhayzt · Apr 23, 2015