[8086:0416] i915 Inability to drive internal (eDP) panel since 4.7 final

[Tony Vroon]

Good morning,

Could you please CC me on any replies as I am not subscribed to this
mailing list.

Recent i915 development appears to have stopped my eDP panel from being
driven correctly. The last working release was 4.6.7; any 4.7 kernel
will not drive the screen and 4.8-RC3 does not drive the screen either.
I have both 4.6.7 and 4.8.0-rc3 kernel images available and am happy to
run any debug/troubleshooting that you require.

The video card in question is:
00:02.0 VGA compatible controller [0300]: Intel Corporation 4th Gen Core
Processor Integrated Graphics Controller [8086:0416] (rev 06) (prog-if
00 [VGA controller])
	Subsystem: Fujitsu Limited. 4th Gen Core Processor Integrated Graphics
Controller [10cf:17aa]
	Flags: bus master, fast devsel, latency 0, IRQ 24
	Memory at f0000000 (64-bit, non-prefetchable) [size=4M]
	Memory at e0000000 (64-bit, prefetchable) [size=256M]
	I/O ports at 3000 [size=64]
	[virtual] Expansion ROM at 000c0000 [disabled] [size=128K]
	Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
	Capabilities: [d0] Power Management version 2
	Capabilities: [a4] PCI Advanced Features
	Kernel driver in use: i915

It is in a Fujitsu E744 with a 1366x768 panel, which does not appear to
have EDID information if I am reading this right:
amalthea tmp # xrandr --verbose
Screen 0: minimum 8 x 8, current 3440 x 2208, maximum 32767 x 32767
eDP1 connected 1366x768+0+1440 (0x4f) normal (normal left inverted right
x axis y axis) 293mm x 165mm
	Identifier: 0x43
	Timestamp:  15668
	Subpixel:   unknown
	Gamma:      1.0:1.0:1.0
	Brightness: 1.0
	Clones:
	CRTC:       0
	CRTCs:      0 1 2
	Transform:  1.000000 0.000000 0.000000
	            0.000000 1.000000 0.000000
	            0.000000 0.000000 1.000000
	           filter:
	BACKLIGHT: 5022
		range: (0, 5022)
	Backlight: 5022
		range: (0, 5022)
	scaling mode: Full aspect
		supported: None, Full, Center, Full aspect
	Broadcast RGB: Automatic
		supported: Automatic, Full, Limited 16:235
	audio: auto
		supported: force-dvi, off, auto, on
  1366x768 (0x4f) 70.000MHz -HSync -VSync *current +preferred
        h: width  1366 start 1402 end 1438 total 1476 skew    0 clock
47.43KHz
        v: height  768 start  772 end  780 total  790           clock
60.03Hz
  1280x720 (0x50) 74.480MHz -HSync +VSync
        h: width  1280 start 1336 end 1472 total 1664 skew    0 clock
44.76KHz
        v: height  720 start  721 end  724 total  746           clock
60.00Hz
  1024x768 (0x51) 65.000MHz -HSync -VSync
        h: width  1024 start 1048 end 1184 total 1344 skew    0 clock
48.36KHz
        v: height  768 start  771 end  777 total  806           clock
60.00Hz
  1024x576 (0x52) 46.995MHz -HSync +VSync
        h: width  1024 start 1064 end 1168 total 1312 skew    0 clock
35.82KHz
        v: height  576 start  577 end  580 total  597           clock
60.00Hz
  960x540 (0x53) 40.784MHz -HSync +VSync
        h: width   960 start  992 end 1088 total 1216 skew    0 clock
33.54KHz
        v: height  540 start  541 end  544 total  559           clock
60.00Hz
  800x600 (0x54) 40.000MHz +HSync +VSync
        h: width   800 start  840 end  968 total 1056 skew    0 clock
37.88KHz
        v: height  600 start  601 end  605 total  628           clock
60.32Hz
  800x600 (0x55) 36.000MHz +HSync +VSync
        h: width   800 start  824 end  896 total 1024 skew    0 clock
35.16KHz
        v: height  600 start  601 end  603 total  625           clock
56.25Hz
  864x486 (0x56) 32.901MHz -HSync +VSync
        h: width   864 start  888 end  976 total 1088 skew    0 clock
30.24KHz
        v: height  486 start  487 end  490 total  504           clock
60.00Hz
  640x480 (0x57) 25.175MHz -HSync -VSync
        h: width   640 start  656 end  752 total  800 skew    0 clock
31.47KHz
        v: height  480 start  490 end  492 total  525           clock
59.94Hz
  720x405 (0x58) 22.176MHz -HSync +VSync
        h: width   720 start  728 end  800 total  880 skew    0 clock
25.20KHz
        v: height  405 start  406 end  409 total  420           clock
60.00Hz
  680x384 (0x59) 19.677MHz -HSync +VSync
        h: width   680 start  688 end  752 total  824 skew    0 clock
23.88KHz
        v: height  384 start  385 end  388 total  398           clock
60.00Hz
  640x360 (0x5a) 17.187MHz -HSync +VSync
        h: width   640 start  640 end  704 total  768 skew    0 clock
22.38KHz
        v: height  360 start  361 end  364 total  373           clock
60.00Hz

The panel backlight is on, but the screen is black. The kernel is
running normally and behaves as if the output is being driven.

Thank you in advance for any assistance you can provide.

Regards,
Tony V.

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