I'm not in front of my Mac right now, so I can't remember the exact name of the location. But launch Console app and it should be in the "logs" or "diagnostic reports" or something. Look around in that app.
Anonymous UUID: 4AB05091-79DF-FA9C-F041-ED2F2923180A
Tue Apr 24 09:17:39 2018
*** Panic Report ***
panic(cpu 0 caller 0xffffff7fa0d4dd7a): "bool IOAccelDisplayMachine2::display_mode_did_change(uint32_t): vendor driver returns false"@/BuildRoot/Library/Caches/com.apple.xbs/Sources/IOAcceleratorFamily_kexts/IOAcceleratorFamily-378.18.1/Kext2/IOAccelDisplayMachine.cpp:490
Backtrace (CPU 0), Frame : Return Address
0xffffff820c5fb580 : 0xffffff801e06e166
0xffffff820c5fb5d0 : 0xffffff801e196714
0xffffff820c5fb610 : 0xffffff801e188a00
0xffffff820c5fb690 : 0xffffff801e020180
0xffffff820c5fb6b0 : 0xffffff801e06dbdc
0xffffff820c5fb7e0 : 0xffffff801e06d99c
0xffffff820c5fb840 : 0xffffff7fa0d4dd7a
0xffffff820c5fb870 : 0xffffff7fa0d7a7d5
0xffffff820c5fb8b0 : 0xffffff7f9f072a46
0xffffff820c5fb960 : 0xffffff7f9f05fa10
0xffffff820c5fb9a0 : 0xffffff7f9f069f15
0xffffff820c5fb9c0 : 0xffffff7f9f064ad0
0xffffff820c5fba30 : 0xffffff7f9f0705e3
0xffffff820c5fba50 : 0xffffff7f9f070ede
0xffffff820c5fba90 : 0xffffff7f9f070cd0
0xffffff820c5fbad0 : 0xffffff801e6c2218
0xffffff820c5fbb20 : 0xffffff7f9f076f2b
0xffffff820c5fbb70 : 0xffffff801e6cae07
0xffffff820c5fbcb0 : 0xffffff801e144a84
0xffffff820c5fbdc0 : 0xffffff801e073680
0xffffff820c5fbe10 : 0xffffff801e0509dd
0xffffff820c5fbe60 : 0xffffff801e0634eb
0xffffff820c5fbef0 : 0xffffff801e1735ad
0xffffff820c5fbfa0 : 0xffffff801e020986
Kernel Extensions in backtrace:
com.apple.iokit.IOGraphicsFamily(519.15)[D5F2A20D-CAB0-33B2-91B9-E8755DFC34CB]@0xffffff7f9f056000->0xffffff7f9f09efff
dependency: com.apple.iokit.IOPCIFamily(2.9)[1850E7DA-E707-3027-A3AA-637C80B57219]@0xffffff7f9e894000
com.apple.iokit.IOAcceleratorFamily2(378.18.1)[BAA0383C-9650-3934-B04A-69008F757A2C]@0xffffff7fa0d43000->0xffffff7fa0dd9fff
dependency: com.apple.driver.AppleMobileFileIntegrity(1.0.5)[54CD88E5-9FD7-30FC-89A0-E4B2D0CE6F85]@0xffffff7f9f01b000
dependency: com.apple.iokit.IOSurface(211.12)[E998B85B-3174-3C25-B82B-C0D8BD9720E5]@0xffffff7fa0d27000
dependency: com.apple.iokit.IOPCIFamily(2.9)[1850E7DA-E707-3027-A3AA-637C80B57219]@0xffffff7f9e894000
dependency: com.apple.iokit.IOGraphicsFamily(519.15)[D5F2A20D-CAB0-33B2-91B9-E8755DFC34CB]@0xffffff7f9f056000
BSD process name corresponding to current thread: WindowServer
Mac OS version:
17E199
Kernel version:
Darwin Kernel Version 17.5.0: Mon Mar 5 22:24:32 PST 2018; root:xnu-4570.51.1~1/RELEASE_X86_64
Kernel UUID: 1B55340B-0B14-3026-8A47-1E139DB63DA3
Kernel slide: 0x000000001de00000
Kernel text base: 0xffffff801e000000
__HIB text base: 0xffffff801df00000
System model name: MacPro6,1 (Mac-F60DEB81FF30ACF6)
System uptime in nanoseconds: 30425444292009
last loaded kext at 244252161813: com.apple.filesystems.msdosfs 1.10 (addr 0xffffff7f9f0b1000, size 69632)
loaded kexts:
com.bitdefender.TMProtection 5.0.0
com.bitdefender.FileProtect 1
com.bitdefender.SelfProtect 1.2.10
com.malwarebytes.mbam.rtprotection 3.2.36
com.apple.filesystems.msdosfs 1.10
com.apple.driver.AGPM 110.23.33
com.apple.driver.ApplePlatformEnabler 2.7.0d0
com.apple.driver.X86PlatformShim 1.0.0
com.apple.filesystems.autofs 3.0
com.apple.driver.AppleHDAHardwareConfigDriver 281.51
com.apple.driver.AppleHDA 281.51
com.apple.driver.AppleUpstreamUserClient 3.6.5
com.apple.driver.AppleMCCSControl 1.5.4
com.apple.kext.AMDFramebuffer 1.6.6
com.apple.kext.AMDRadeonX4000 1.6.6
com.apple.driver.AppleGraphicsDevicePolicy 3.18.48
com.apple.AGDCPluginDisplayMetrics 3.18.48
com.apple.driver.AppleHV 1
com.apple.iokit.IOUserEthernet 1.0.1
com.apple.iokit.IOBluetoothSerialManager 6.0.5f3
com.apple.driver.ACPI_SMC_PlatformPlugin 1.0.0
com.apple.driver.eficheck 1
com.apple.driver.pmtelemetry 1
com.apple.Dont_Steal_Mac_OS_X 7.0.0
com.apple.driver.AppleLPC 3.1
com.apple.driver.AppleFIVRDriver 4.1.0
com.apple.driver.AppleIntelMCEReporter 107
com.apple.driver.AppleMGPUPowerControl 3.18.48
com.apple.kext.AMD7000Controller 1.6.6
com.apple.driver.AppleOSXWatchdog 1
com.apple.driver.AudioAUUC 1.70
com.apple.driver.AppleIntelSlowAdaptiveClocking 4.0.0
com.apple.driver.AppleThunderboltIP 3.1.1
com.apple.iokit.IOBluetoothUSBDFU 6.0.5f3
com.apple.iokit.SCSITaskUserClient 404.30.2
com.apple.driver.AppleFileSystemDriver 3.0.1
com.apple.filesystems.hfs.kext 407.50.6
com.apple.AppleFSCompression.AppleFSCompressionTypeDataless 1.0.0d1
com.apple.BootCache 40
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib 1.0.0
com.apple.filesystems.apfs 748.51.0
com.apple.iokit.AppleBCM5701Ethernet 10.3.1
com.apple.driver.AirPort.BrcmNIC 1240.29.1a7
com.apple.driver.AppleAHCIPort 329.50.2
com.apple.driver.AppleACPIEC 6.1
com.apple.driver.AppleACPIButtons 6.1
com.apple.driver.AppleRTC 2.0
com.apple.driver.AppleHPET 1.8
com.apple.driver.AppleSMBIOS 2.1
com.apple.driver.AppleAPIC 1.7
com.apple.driver.AppleIntelCPUPowerManagementClient 220.50.1
com.apple.nke.applicationfirewall 183
com.apple.security.TMSafetyNet 8
com.apple.security.quarantine 3
com.apple.driver.AppleIntelCPUPowerManagement 220.50.1
com.apple.kext.triggers 1.0
com.apple.driver.DspFuncLib 281.51
com.apple.kext.OSvKernDSPLib 526
com.apple.driver.AppleSMBusController 1.0.18d1
com.apple.kext.AMDRadeonX4030HWLibs 1.0
com.apple.iokit.IOAcceleratorFamily2 378.18.1
com.apple.kext.AMDRadeonX4000HWServices 1.6.6
com.apple.iokit.IOAVBFamily 675.6
com.apple.plugin.IOgPTPPlugin 675.12
com.apple.driver.AppleSSE 1.0
com.apple.iokit.IOSurface 211.12
com.apple.iokit.IOSerialFamily 11
com.apple.driver.IOPlatformPluginLegacy 1.0.0
com.apple.driver.X86PlatformPlugin 1.0.0
com.apple.iokit.IOUSBHIDDriver 900.4.1
com.apple.driver.IOPlatformPluginFamily 6.0.0d8
com.apple.driver.AppleHDAController 281.51
com.apple.iokit.IOHDAFamily 281.51
com.apple.driver.AppleSMBusPCI 1.0.14d1
com.apple.driver.AppleGraphicsControl 3.18.48
com.apple.driver.AppleBacklightExpert 1.1.0
com.apple.iokit.IONDRVSupport 519.15
com.apple.kext.AMDSupport 1.6.6
com.apple.AppleGPUWrangler 3.18.48
com.apple.AppleGraphicsDeviceControl 3.18.48
com.apple.iokit.IOGraphicsFamily 519.15
com.apple.iokit.IOSlowAdaptiveClockingFamily 1.0.0
com.apple.driver.AppleThunderboltEDMSink 4.1.4
com.apple.driver.AppleThunderboltDPOutAdapter 5.5.3
com.apple.driver.AppleUSBAudio 312.6
com.apple.iokit.IOAudioFamily 206.5
com.apple.vecLib.kext 1.2.0
com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport 6.0.5f3
com.apple.iokit.IOBluetoothHostControllerUSBTransport 6.0.5f3
com.apple.iokit.IOBluetoothHostControllerTransport 6.0.5f3
com.apple.iokit.IOBluetoothFamily 6.0.5f3
com.apple.driver.AppleHIDKeyboard 205
com.apple.driver.usb.IOUSBHostHIDDevice 1.2
com.apple.driver.usb.cdc 5.0.0
com.apple.driver.usb.networking 5.0.0
com.apple.driver.usb.AppleUSBHostCompositeDevice 1.2
com.apple.driver.usb.AppleUSBHub 1.2
com.apple.filesystems.hfs.encodings.kext 1
com.apple.driver.AppleThunderboltDPInAdapter 5.5.3
com.apple.driver.AppleThunderboltDPAdapterFamily 5.5.3
com.apple.driver.AppleThunderboltPCIDownAdapter 2.1.3
com.apple.driver.AppleXsanScheme 3
com.apple.iokit.IOAHCIBlockStorage 301.40.2
com.apple.driver.AppleThunderboltNHI 4.7.2
com.apple.iokit.IOThunderboltFamily 6.7.8
com.apple.driver.AppleUSBMergeNub 900.4.1
com.apple.driver.usb.AppleUSBXHCIPCI 1.2
com.apple.driver.usb.AppleUSBXHCI 1.2
com.apple.iokit.IOEthernetAVBController 1.1.0
com.apple.iokit.IO80211Family 1200.12.2
com.apple.driver.mDNSOffloadUserClient 1.0.1b8
com.apple.driver.corecapture 1.0.4
com.apple.iokit.IOAHCIFamily 288
com.apple.driver.usb.AppleUSBEHCIPCI 1.2
com.apple.driver.usb.AppleUSBEHCI 1.2
com.apple.driver.usb.AppleUSBHostPacketFilter 1.0
com.apple.iokit.IOUSBFamily 900.4.1
com.apple.driver.AppleUSBHostMergeProperties 1.2
com.apple.driver.AppleEFINVRAM 2.1
com.apple.iokit.IOSMBusFamily 1.1
com.apple.iokit.IOHIDFamily 2.0.0
com.apple.driver.AppleEFIRuntime 2.1
com.apple.security.sandbox 300.0
com.apple.kext.AppleMatch 1.0.0d1
com.apple.driver.DiskImages 480.50.10
com.apple.driver.AppleFDEKeyStore 28.30
com.apple.driver.AppleEffaceableStorage 1.0
com.apple.driver.AppleKeyStore 2
com.apple.driver.AppleUSBTDM 439.50.6
com.apple.driver.AppleMobileFileIntegrity 1.0.5
com.apple.iokit.IOUSBMassStorageDriver 140.50.3
com.apple.iokit.IOSCSIBlockCommandsDevice 404.30.2
com.apple.iokit.IOSCSIArchitectureModelFamily 404.30.2
com.apple.iokit.IOStorageFamily 2.1
com.apple.driver.AppleCredentialManager 1.0
com.apple.driver.KernelRelayHost 1
com.apple.iokit.IOUSBHostFamily 1.2
com.apple.driver.usb.AppleUSBCommon 1.0
com.apple.driver.AppleBusPowerController 1.0
com.apple.driver.AppleSEPManager 1.0.1
com.apple.driver.IOSlaveProcessor 1
com.apple.iokit.IOReportFamily 31
com.apple.iokit.IOTimeSyncFamily 675.12
com.apple.iokit.IONetworkingFamily 3.4
com.apple.driver.AppleACPIPlatform 6.1
com.apple.driver.AppleSMC 3.1.9
com.apple.iokit.IOPCIFamily 2.9
com.apple.iokit.IOACPIFamily 1.4
com.apple.kec.pthread 1
com.apple.kec.Libm 1
com.apple.kec.corecrypto 1.0
EOF
System Profile:
Network Service: Wi-Fi, AirPort, en2
Thunderbolt Bus: Mac Pro, Apple Inc., 19.2
Thunderbolt Bus: Mac Pro, Apple Inc., 19.2
Thunderbolt Bus: Mac Pro, Apple Inc., 19.2
Boot Volume File System Type: apfs
PCI Card: AMD FirePro D300, Display Controller, Slot-1
PCI Card: AMD FirePro D300, Display Controller, Slot-2
Memory Module: DIMM1, 4 GB, DDR3 ECC, 1866 MHz, 0x80AD, 0x484D54343531553741465238432D52442020
Memory Module: DIMM2, 4 GB, DDR3 ECC, 1866 MHz, 0x80AD, 0x484D54343531553741465238432D52442020
Memory Module: DIMM3, 4 GB, DDR3 ECC, 1866 MHz, 0x80AD, 0x484D54343531553741465238432D52442020
Memory Module: DIMM4, 4 GB, DDR3 ECC, 1866 MHz, 0x80AD, 0x484D54343531553741465238432D52442020
USB Device: USB 2.0 Bus
USB Device: Hub
USB Device: BRCM20702 Hub
USB Device: Bluetooth USB Host Controller
USB Device: USB 3.0 Bus
USB Device: Hub
USB Device: Hub
USB Device: P9223 Slim
USB Device: Hub
USB Device: Hub
USB Device: USB Receiver
USB Device: Cruzer Mini
USB Device: MM-1
USB Device: USB2.0 Hub
USB Device: Matias Backlit Keyboard
Serial ATA Device: APPLE SSD SM0256G, 251 GB
Model: MacPro6,1, BootROM MP61.0123.B00, 4 processors, Quad-Core Intel Xeon E5, 3.7 GHz, 16 GB, SMC 2.20f18
Graphics: AMD FirePro D300, AMD FirePro D300, PCIe
Graphics: AMD FirePro D300, AMD FirePro D300, PCIe
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x135), Broadcom BCM43xx 1.0 (7.77.37.29.1a7)
Bluetooth: Version 6.0.5f3, 3 services, 27 devices, 1 incoming serial ports