[Bug 105406] No internal display on kernels > 4.4.x

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105406

--- Comment #8 from Elizabeth <elizabethx.de.la.torre.mena at intel.com> ---
Created attachment 138133
  --> https://bugs.freedesktop.org/attachment.cgi?id=138133&action=edit
kernel_4-4-120_working_display

>From the 4.4.120 dmesg:

After the DP-2 is detected:

[   15.410309] [drm:intel_dp_detect] [CONNECTOR:39:DP-2]
[   15.410845] [drm:intel_dp_get_dpcd] DPCD: 10 0a 82 40 00 00 01 00 02 00 00
00 10 01 00
[   15.410850] [drm:intel_dp_get_dpcd] Display Port TPS3 support: source no,
sink no
[   15.410853] [drm:intel_dp_print_rates] source rates: 162000, 270000
[   15.410855] [drm:intel_dp_print_rates] sink rates: 162000, 270000
[   15.410858] [drm:intel_dp_print_rates] common rates: 162000, 270000

The modes of that connector are probed: 

[   15.424921] [drm:drm_helper_probe_single_connector_modes_merge_bits]
[CONNECTOR:39:DP-2] probed modes :
[   15.424926] [drm:drm_mode_debug_printmodeline] Modeline 43:"1024x768" 60
65000 1024 1048 1184 1344 768 772 778 806 0x48 0xa
[   15.424930] [drm:drm_mode_debug_printmodeline] Modeline 45:"1024x768" 85
94500 1024 1072 1168 1376 768 769 772 808 0x40 0x5
[   15.424934] [drm:drm_mode_debug_printmodeline] Modeline 44:"848x480" 60
33750 848 864 976 1088 480 486 494 517 0x40 0x5

And the connector detected as enable is the DP-2(39):

[   15.424970] [drm:drm_enable_connectors] connector 27 enabled? no
[   15.424972] [drm:drm_enable_connectors] connector 30 enabled? no
[   15.424974] [drm:drm_enable_connectors] connector 35 enabled? no
[   15.424976] [drm:drm_enable_connectors] connector 37 enabled? no
[   15.424986] [drm:drm_enable_connectors] connector 39 enabled? yes

Meanwhile, in the 4.15 dmesg:

After the dp-2 is detected:

[   14.988279] [drm:intel_dp_detect [i915]] [CONNECTOR:60:DP-2]
[   14.988821] [drm:intel_dp_read_dpcd [i915]] DPCD: 10 0a 82 40 00 00 01 00 02
00 00 00 10 01 00
[   14.989157] [drm:drm_helper_hpd_irq_event [drm_kms_helper]]
[CONNECTOR:60:DP-2] status updated from unknown to disconnected

The connector probed is VGA instead:

[   14.989251] [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]]
[CONNECTOR:48:VGA-1]
[   14.989298] [drm:intel_crt_detect [i915]] [CONNECTOR:48:VGA-1] force=1
[   14.989328] [drm:intel_crt_detect [i915]] ironlake hotplug adpa=0xa3f40018,
result 1
[   14.989349] [drm:intel_crt_detect [i915]] CRT detected via hotplug
[   15.027723] [drm:drm_add_display_info [drm]] non_desktop set to 0
[   15.027744] [drm:drm_add_display_info [drm]] non_desktop set to 0
[   15.027822] [drm:intel_connector_update_modes [i915]] ELD: no CEA Extension
found
[   15.027908] [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]]
[CONNECTOR:48:VGA-1] probed modes :
[   15.027927] [drm:drm_mode_debug_printmodeline [drm]] Modeline 65:"1280x1024"
60 108000 1280 1328 1440 1688 1024 1025 1028 1066 0x48 0x5
[   15.027943] [drm:drm_mode_debug_printmodeline [drm]] Modeline 71:"1280x1024"
75 135000 1280 1296 1440 1688 1024 1025 1028 1066 0x40 0x5
[   15.027959] [drm:drm_mode_debug_printmodeline [drm]] Modeline 66:"1152x864"
75 108000 1152 1216 1344 1600 864 865 868 900 0x40 0x5 ...

And the one detected as enable is the vga(48):

[   15.174252] [drm:drm_setup_crtcs [drm_kms_helper]] connector 48 enabled? yes
[   15.174264] [drm:drm_setup_crtcs [drm_kms_helper]] connector 51 enabled? no
[   15.174270] [drm:drm_setup_crtcs [drm_kms_helper]] connector 56 enabled? no
[   15.174275] [drm:drm_setup_crtcs [drm_kms_helper]] connector 58 enabled? no
[   15.174280] [drm:drm_setup_crtcs [drm_kms_helper]] connector 60 enabled? no

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