Comment # 7
on bug 98505
from Peter Wu
Created attachment 127678 [details] [review] amdgpu patch that checks whether the new interface can be used for PM PCIe port PM is not enabled because this BIOS is pre-2015: 12/04/2014 The BIOS seems to be able to report support for lots of things (can you post a fuller dmesg that include the supported functions?): Scope (\_SB.PCI0.GFX0) { Method (ATPX, 2, Serialized) { // ... If (Arg0 == One) { Name (TMP2, Buffer (0x0100) { 0x00 }) CreateWordField (TMP2, Zero, F1SS) CreateDWordField (TMP2, 0x02, F1VM) CreateDWordField (TMP2, 0x06, F1FG) F1SS = 0x0A F1VM = 0x7FC0 If ((\_SB.PCI0.RP05.PXSX.SGMD & 0x0F) == 0x02) { // ... If (\_SB.PCI0.RP05.PXSX.PXDY == One) { F1FG |= 0x80 /* ATPX_DYNAMIC_PX_SUPPORTED */ F1VM |= 0x80 } // If (\_SB.PCI0.RP05.PXSX.FDPD == One) { F1FG |= 0x0400 /* ATPX_DYNAMIC_DGPU_POWER_OFF_SUPPORTED */ F1VM |= 0x0400 If (OSYS >= 0x07DC) { F1FG |= 0x0800 /* ATPX_DGPU_REQ_POWER_FOR_DISPLAYS */ F1VM |= 0x0800 } } // ... If (OSYS >= 0x07DD) { F1FG |= 0x4000 /* ATPX_MS_HYBRID_GFX_SUPPORTED */ F1VM |= 0x4000 } amdgpu (and radeon) needs to check whether PCIe port PM is really supported. Possible patch is attached (there should probably be a pci_d3cold_disable call somewhere, see commit 279cf3f23870f7eb8ca071115e06d3d5ca0a2b9e for nouveau).
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