Link training fails and retries forever

[oblitzitate]

Description

When QEMU launches, it remains black screen and the debug log shows it's looping on "Link training failed... Retrying link training".

On the other hand, using kethen/edk2 + i440fx (not q35) actually works though.

Regardless, I'm more interested in trying to see if q35 works which is why I tried using the i915ovmf rom instead.

System Info

• Host OS(Distro/Version): Arch Linux (Kernel 5.15.8-zen1-1-zen)
• CPU: i5-7300HQ 2.5GHz (Kaby Lake)
• GPUs: Intel HD Graphics 630 + Nvidia Geforce GTX 1050Ti Mobile
• Guest OS: Windows 10
• GVT-D
• Display connections: eDP
• i915ovmfPkg Release version or Commit: Followed the 'Compiling' wiki

Qemu command

Used included scripts. Tried both i440fx and q35.

Logs

Driver starts!
i915: found device 8086-591B 0
i915: start
i915: set pci attrs
i915: made gop path
i915: installed child handle
i915: before QEMU shenanigans
BdsmSize=8388608
i915: vbt: 0x7FBFB400, bdb: 0x7FBFB430, sig: $B KLK    d0Øu0, bsig: BO_AABOKѧþ 
i915: finding section 2
i915: Boot display type: 0x0000
i915: Child device size: 38
i915: Child device count: 8
i915: SetupOpRegion: OpRegion @ 0x7FBFB000 size 0x2000 in 2 pages
SetupStolenMemory: : stolen memory @ 0x7DA00000 size 0x800000
i915: SetupFwcfgStuff returns 0
i915: after QEMU shenanigans
Port A VBT info: CRT:0 DVI:0 HDMI:0 DP:1 eDP:1 USB-Type-C:0 TBT:0 type:1806
VBT HDMI level shift for port A: 0
VBT DP max link rate for port A: 810000
Port B VBT info: CRT:0 DVI:0 HDMI:0 DP:0 eDP:0 USB-Type-C:0 TBT:0 type:0000
VBT HDMI level shift for port B: 3
VBT DP max link rate for port B: 810000
Port C VBT info: CRT:0 DVI:0 HDMI:0 DP:0 eDP:0 USB-Type-C:0 TBT:0 type:0000
VBT HDMI level shift for port C: 8
VBT DP max link rate for port C: 810000
More than one child device for port A in VBT, using the first.
Port E VBT info: CRT:0 DVI:0 HDMI:0 DP:0 eDP:0 USB-Type-C:0 TBT:0 type:0000
VBT HDMI level shift for port E: 0
VBT DP max link rate for port E: 810000
More than one child device for port A in VBT, using the first.
More than one child device for port A in VBT, using the first.
More than one child device for port A in VBT, using the first.
i915: power well enabled F00003FF
panel power sequencer register settings: PP_ON #x, PP_OFF #x, PP_DIV #x
PP_CTL:  00000000, PP_STAT  00000000 
PP_CTL:  00000003, PP_STAT  9000000A 
PP_CTL:  00000003, PP_STAT  90000009 
i915: CDCLK = 080002A1
i915: DBUF timeout
i915: _PLANE_BUF_CFG_1_A = 00000000
i915: _PLANE_BUF_CFG_1_A = 035B0000 (after)
i915: SFUSE_STRAP = 00000000
Port A VBT info: DVI:0 HDMI:0 DP:1 eDP:1
i915: Port Is Connected!
using AUX A for port A (VBT)
i915: Port is DP/EdP. Aux_ch is 0 
i915: trying DP aux 0
i915: reading DP aux 0
00 FF FF FF FF FF FF 00 
30 E4 90 05 00 00 00 00 
00 1B 01 04 95 22 13 78 
EA A1 C5 94 59 57 8F 27 
20 50 54 00 00 00 01 01 
01 01 01 01 01 01 01 01 
01 01 01 01 01 01 2E 36 
80 A0 70 38 1F 40 30 20 
35 00 58 C2 10 00 00 1A 
00 00 00 00 00 00 00 00 
00 00 00 00 00 00 00 00 
00 00 00 00 00 FE 00 4C 
47 20 44 69 73 70 6C 61 
79 0A 20 20 00 00 00 FE 
00 4C 50 31 35 36 57 46 
36 2D 53 50 4B 36 00 5E 
i915: ReadEDIDDP returned 0 
I915: DUsing Connector Mode: 3, On Port 0Reading PP_STATUS: 2415919113 
i915: got EDID:
00 FF FF FF FF FF FF 00 
30 E4 90 05 00 00 00 00 
00 1B 01 04 95 22 13 78 
EA A1 C5 94 59 57 8F 27 
20 50 54 00 00 00 01 01 
01 01 01 01 01 01 01 01 
01 01 01 01 01 01 2E 36 
80 A0 70 38 1F 40 30 20 
35 00 58 C2 10 00 00 1A 
00 00 00 00 00 00 00 00 
00 00 00 00 00 00 00 00 
00 00 00 00 00 FE 00 4C 
47 20 44 69 73 70 6C 61 
79 0A 20 20 00 00 00 FE 
00 4C 50 31 35 36 57 46 
36 2D 53 50 4B 36 00 5E 
i915: bar ranges - 812000000 1000000, 800000000 10000000
i915: aperture at 800000000
i915: gmadr = 00000000, size = 00000000, hgmadr = 00000000, hsize = 00000000
i915: 1920x1080 clock=138700
i915: ggtt_base at 812800000, entries: 044A2001 044A2001, backing fb: 7D200000, 7F9E00 bytes
i915: progressed to mline 673, status is 0
i915: set mode 0
i915: DPLL 1 not locked
Link Rate: 0
i915: DPLL_CTRL1 = 00000543
i915: _DPLL1_CFGCR1 = 00000000
i915: _DPLL1_CFGCR2 = 00000000
i915: DPLL 1 locked
i915: port is 0
i915: DPLL_CTRL2 = 00A00003
PP_CTL:  00000003, PP_STAT  90000009 
Using LINK_BW_SET value 10
this_v:1 v:0  this_p:0  p:0 
this_v:1 v:1  this_p:0  p:0 
v:1  p:0 
TrainSet[0]: 1 
TrainSet[1]: 1 
TrainSet[2]: 1 
TrainSet[3]: 1 
Using signal levels 02000000
this_v:2 v:0  this_p:0  p:0 
this_v:2 v:2  this_p:0  p:0 
v:6  p:0 
TrainSet[0]: 6 
TrainSet[1]: 6 
TrainSet[2]: 6 
TrainSet[3]: 6 
Using signal levels 04000000
Max Voltage Swing reached
 Link Training failed at link rate = 270000, lane count = 2Mode: 416100, Max:324000
Retrying Link training for eDP with same parameters
i915: DPLL 1 not locked
Link Rate: 270000
i915: DPLL_CTRL1 = 000004C3
i915: _DPLL1_CFGCR1 = 00000000
i915: _DPLL1_CFGCR2 = 00000000
i915: DPLL 1 locked
i915: port is 0
i915: DPLL_CTRL2 = 00A00003
Using LINK_BW_SET value 10
this_v:2 v:0  this_p:0  p:0 
this_v:2 v:2  this_p:0  p:0 
v:6  p:0 
TrainSet[0]: 6 
TrainSet[1]: 6 
TrainSet[2]: 6 
TrainSet[3]: 6 
Using signal levels 04000000
Max Voltage Swing reached
 Link Training failed at link rate = 270000, lane count = 2Mode: 416100, Max:324000
Retrying Link training for eDP with same parameters
i915: DPLL 1 not locked
Link Rate: 270000
i915: DPLL_CTRL1 = 000004C3
i915: _DPLL1_CFGCR1 = 00000000
i915: _DPLL1_CFGCR2 = 00000000
i915: DPLL 1 locked
i915: port is 0
i915: DPLL_CTRL2 = 00A00003
Using LINK_BW_SET value 10
this_v:2 v:0  this_p:0  p:0 
this_v:2 v:2  this_p:0  p:0 
v:6  p:0 
TrainSet[0]: 6 
TrainSet[1]: 6 
TrainSet[2]: 6 
TrainSet[3]: 6 
Using signal levels 04000000
Max Voltage Swing reached
 Link Training failed at link rate = 270000, lane count = 2Mode: 416100, Max:324000