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Dell mobile Precision 7510 Intel hd530, black screen


ss2sameer

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If you suspect a CMOS reset by the OS, there are 2 things you can try:

 

1) patch your DSDT RTC device from:

       Device (RTC)
       {
           Name (_HID, EisaId ("PNP0B00"))  // _HID: Hardware ID
           Name (_CRS, ResourceTemplate ()  // _CRS: Current Resource Settings
           {
               IO (Decode16,
                   0x0070,             // Range Minimum
                   0x0070,             // Range Maximum
                   0x01,               // Alignment
                   0x02,               // Length          ---> Set to 2 by default
                   )
           })
       }

to:

       Device (RTC)
       {
           Name (_HID, EisaId ("PNP0B00"))  // _HID: Hardware ID
           Name (_CRS, ResourceTemplate ()  // _CRS: Current Resource Settings
           {
               IO (Decode16,
                   0x0070,             // Range Minimum
                   0x0070,             // Range Maximum
                   0x01,               // Alignment
                   0x08,               // Length          ---> Changed to 8
                   )
           })
       }

2) Install the pre-patched AppleRTC kext

 
You may try either/or as well as both at the same time but it may not fix your issue.
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