2013 MBP Backlight Issue

[motormayhem]

Hello,
I have an early 2013 15in MBP running Mojave 10.14.6. It has an issue where when it awakens from sleep or sometimes while running the backlight will turn off. The screen is still working as you can shine a light though the logo and see the screen. The keyboard lights work still. Sometimes a reboot or a reset of the pram will correct the issue. Since I can fix the issue with a pram reset it makes me think its not a hardware issue. I also noticed that when the issue is occurring and I hit the buttons on the keyboard to adjust the brightness the window showing the brightness level does not appear on the screen (looking at the screen with a flashlight through the logo). So it seems the software is aware the screen has no backlight as that window will show up normally when the screen is working (backlight on). What should I be checking to troubleshoot? Apple just said it was probably something hardware and wasn't worth fixing when I brought it in.

 

[motormayhem]

This seems to be the crash report from when I restart and the screen turns back on

*** Panic Report *** panic(cpu 2 caller 0xffffff7fa9264681): GPU Panic: mux-regs 4 0 a0 99 0 8 severity 3 WS-ready 1 switch-state 3 IG FBs 1 EG FBs 0:0 power-state 3 3D idle HDA idle : AGC GPU REGISTER RESTORE FAILED with 1 reset, VendorID invalid Backtrace (CPU 2), Frame : Return Address 0xffffff921454bab0 : 0xffffff80265ae5ad 0xffffff921454bb00 : 0xffffff80266ea1f5 0xffffff921454bb40 : 0xffffff80266db92a 0xffffff921454bbb0 : 0xffffff802655b9d0 0xffffff921454bbd0 : 0xffffff80265adfc7 0xffffff921454bcf0 : 0xffffff80265ade13 0xffffff921454bd60 : 0xffffff7fa9264681 0xffffff921454bdc0 : 0xffffff7fa926079d 0xffffff921454be00 : 0xffffff7fa92640de 0xffffff921454be20 : 0xffffff8026c5e0b7 0xffffff921454be90 : 0xffffff8026c5dfd9 0xffffff921454bec0 : 0xffffff80265ed7e5 0xffffff921454bf40 : 0xffffff80265ed385 0xffffff921454bfa0 : 0xffffff802655b0ce Kernel Extensions in backtrace: com.apple.driver.AppleMuxControl(3.50.16)[C7F3A5B6-5E74-3C4C-A78F-A4FA28FB90D7]@0xffffff7fa9255000->0xffffff7fa9268fff dependency: com.apple.driver.AppleGraphicsControl(3.50.16)[256CB3F2-6F11-3E6E-85DB-E12CB1DFD9B8]@0xffffff7fa9252000 dependency: com.apple.iokit.IOACPIFamily(1.4)[8775297B-2CDC-324B-9EA2-C4873760FA04]@0xffffff7fa7423000 dependency: com.apple.iokit.IOPCIFamily(2.9)[2328355E-F574-3D2A-A77D-A69917B3ED1D]@0xffffff7fa6e95000 dependency: com.apple.iokit.IOGraphicsFamily(530.68)[66927C1E-F32E-392C-A201-783942CFC7A0]@0xffffff7fa88a5000 dependency: com.apple.AppleGraphicsDeviceControl(3.50.16)[DF914081-B742-306B-8D32-A1DB779CDAAD]@0xffffff7fa8935000 BSD process name corresponding to current thread: kernel_task Mac OS version: 18G7016 Kernel version: Darwin Kernel Version 18.7.0: Tue Nov 10 00:07:31 PST 2020; root:xnu-4903.278.51~1/RELEASE_X86_64 Kernel UUID: 0F94ABBC-EB06-3DEE-A01B-6F82102C1848 Kernel slide: 0x0000000026200000 Kernel text base: 0xffffff8026400000 __HIB text base: 0xffffff8026300000 System model name: MacBookPro10,1 (Mac-C3EC7CD22292981F) System uptime in nanoseconds: 68316631712 last loaded kext at 46781035508: com.apple.driver.AppleHWSensor 1.9.5d0 (addr 0xffffff7fa9eb2000, size 28672)