[Bug 215003] apple_gmux fails to initialize and iGPU unclaimed on MacBook Pro 16" 2019

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=215003

--- Comment #4 from Xiaolei Yu (dreifachstein at gmail.com) ---
gpu-switch does not work because `EFI runtime services are disabled`.

[    0.371791] ------------[ cut here ]------------
[    0.371822] [Firmware Bug]: Page fault caused by firmware at PA:
0xffffb6ee80068000
[    0.371872] WARNING: CPU: 0 PID: 75 at arch/x86/platform/efi/quirks.c:734
efi_crash_gracefully_on_page_fault+0x49/0xc0
[    0.371942] Modules linked in:
[    0.371963] CPU: 0 PID: 75 Comm: kworker/u24:4 Not tainted 5.14.17+ #9
[    0.372006] Hardware name: Apple Inc. MacBookPro16,1/Mac-E1008331FDC96864,
BIOS 1554.120.19.0.0 (iBridge: 18.16.14663.0.0,0) 05/07/2021
[    0.372083] Workqueue: efi_rts_wq efi_call_rts
[    0.372114] RIP: 0010:efi_crash_gracefully_on_page_fault+0x49/0xc0
[    0.372154] Code: 48 89 fd e8 09 8d 02 00 48 81 fd ff 0f 00 00 76 08 48 3d
50 a0 61 b1 74 02 5d c3 48 89 ee 48 c7 c7 40 bf 6c b0 e8 f5 22 7e 00 <0f> 0b 83
3d 7e 0e fa 01 0a 0f 84 17 1e 7e 00 e8 53 19 00 00 48 8b
[    0.372271] RSP: 0000:ffffb6ee8033ab30 EFLAGS: 00010086
[    0.372305] RAX: 0000000000000000 RBX: 0000000000000000 RCX:
ffffffffb0cb4a08
[    0.372350] RDX: 0000000000000000 RSI: 00000000ffffefff RDI:
ffffffffb0c5ca00
[    0.372395] RBP: ffffb6ee80068000 R08: 0000000000000000 R09:
ffffb6ee8033a958
[    0.372440] R10: ffffb6ee8033a950 R11: ffffffffb0ccca48 R12:
ffffb6ee8033abc8
[    0.374667] R13: 0000000000000000 R14: 0000000000000000 R15:
0000000000000000
[    0.376933] FS:  0000000000000000(0000) GS:ffff9fc8aea00000(0000)
knlGS:0000000000000000
[    0.379162] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    0.381422] CR2: ffffb6ee80068000 CR3: 00000001001a8006 CR4:
00000000003706f0
[    0.383698] Call Trace:
[    0.385899]  page_fault_oops+0x9c/0x240
[    0.388141]  exc_page_fault+0xcc/0x150
[    0.390313]  asm_exc_page_fault+0x1e/0x30
[    0.392540] RIP: 0010:0xfffffffeefc440c5
[    0.394703] Code: 31 c9 48 29 f9 48 83 e1 0f 74 0c 4c 39 c1 49 0f 47 c8 49
29 c8 f3 a4 4c 89 c1 49 83 e0 0f 48 c1 e9 04 74 2c f3 0f 7f 44 24 18 <f3> 0f 6f
06 66 0f e7 07 48 83 c6 10 48 83 c7 10 e2 ee 0f ae f0 66
[    0.397081] RSP: 0000:ffffb6ee8033ac78 EFLAGS: 00010286
[    0.399456] RAX: fffffffeefc921e5 RBX: ffffffffb0709ce2 RCX:
0000000000000035
[    0.401753] RDX: ffffb6ee80067d48 RSI: ffffb6ee80067ff3 RDI:
fffffffeefc92490
[    0.404119] RBP: ffffb6ee8033ad00 R08: 000000000000000c R09:
ffffb6ee8006834e
[    0.406426] R10: 0000000000000000 R11: 00000000005ef3bd R12:
0000000000000000
[    0.408788] R13: ffffb6ee80067dd0 R14: ffffb6ee80067d01 R15:
0000000000000607
[    0.411101]  ? __efi_call+0x28/0x30
[    0.413426]  ? switch_mm_irqs_off+0x19a/0x3b0
[    0.415753]  ? efi_call_rts+0x17c/0x6c0
[    0.418001]  ? process_one_work+0x1ec/0x390
[    0.420289]  ? worker_thread+0x53/0x3e0
[    0.422515]  ? process_one_work+0x390/0x390
[    0.424780]  ? kthread+0x127/0x150
[    0.426991]  ? set_kthread_struct+0x40/0x40
[    0.429254]  ? ret_from_fork+0x22/0x30
[    0.431488] ---[ end trace d9718208699f023a ]---

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