Bug 109336 - gma500_gfx misdetects LVDS-1 as connected causing black screen
Summary: gma500_gfx misdetects LVDS-1 as connected causing black screen
Status: RESOLVED MOVED
Alias: None
Product: DRI
Classification: Unclassified
Component: DRM/other (show other bugs)
Version: unspecified
Hardware: x86-64 (AMD64) Linux (All)
: medium minor
Assignee: Default DRI bug account
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Reported: 2019-01-13 12:32 UTC by Dominik 'Rathann' Mierzejewski
Modified: 2019-11-19 08:53 UTC (History)
0 users

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Description Dominik 'Rathann' Mierzejewski 2019-01-13 12:32:49 UTC
On a Thecus N5550 NAS box (Intel Atom D2550/Cedarview platform), the gma500_gfx driver detects LVDS-1 output as connected (it's not):

Jan 13 13:15:09 kernel: [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:36:LVDS-1] status updated from unknown to connected

Only VGA-1 is connected, but that's detected correctly. This causes black screen after kernel loads the driver. Adding video=LVDS-1:d to the kernel command line works around the issue.

The kernel version is 4.19.13-300.fc29.x86_64 (Fedora 29). Kernel output with drm.debug=0xe:

Jan 13 13:15:08 kernel: [drm:psb_intel_opregion_setup [gma500_gfx]] Public ACPI methods supported
Jan 13 13:15:08 kernel: [drm:psb_intel_opregion_setup [gma500_gfx]] ASLE supported
Jan 13 13:15:08 kernel: [drm:psb_intel_init_bios [gma500_gfx]] Using VBT from OpRegion: $VBT CEDARVIEW      d
Jan 13 13:15:08 kernel: [drm:drm_mode_debug_printmodeline [drm]] Modeline 0:"1024x768" 0 65000 1024 1048 1184 1344 768 771 777 806 0x8 0xa
Jan 13 13:15:08 kernel: [drm:psb_intel_init_bios [gma500_gfx]] No SDVO device info is found in VBT
Jan 13 13:15:08 kernel: [drm:psb_intel_init_bios [gma500_gfx]] EDP timing in vbt t1_t3 2000 t8 10 t9 2000 t10 500 t11_t12 5000
Jan 13 13:15:08 kernel: [drm:psb_intel_init_bios [gma500_gfx]] VBT reports EDP: Lane_count 1, Lane_rate 6, Bpp 18
Jan 13 13:15:08 kernel: [drm:psb_intel_init_bios [gma500_gfx]] VBT reports EDP: VSwing  0, Preemph 0
Jan 13 13:15:08 kernel: [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
Jan 13 13:15:08 kernel: [drm] No driver support for vblank timestamp query.
Jan 13 13:15:08 kernel: [drm:drm_do_probe_ddc_edid [drm]] drm: skipping non-existent adapter intel drm LVDSDDC_C
Jan 13 13:15:08 kernel: [drm:cdv_intel_dp_init [gma500_gfx]] i2c_init DPDDC-B
Jan 13 13:15:08 kernel: [drm:cdv_intel_dp_aux_ch [gma500_gfx]] dp_aux_ch timeout status 0x51440064
Jan 13 13:15:08 kernel: [drm:cdv_intel_dp_i2c_aux_ch [gma500_gfx]] aux_ch failed -110
Jan 13 13:15:08 kernel: [drm:cdv_intel_dp_aux_ch [gma500_gfx]] dp_aux_ch timeout status 0x51440064
Jan 13 13:15:08 kernel: [drm:cdv_intel_dp_i2c_aux_ch [gma500_gfx]] aux_ch failed -110
Jan 13 13:15:08 kernel: [drm:drm_setup_crtcs [drm_kms_helper]] 
Jan 13 13:15:08 kernel: [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:34:VGA-1]
Jan 13 13:15:08 kernel: [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:34:VGA-1] status updated from unknown to connected
Jan 13 13:15:09 kernel: [drm:drm_add_display_info [drm]] non_desktop set to 0
Jan 13 13:15:09 kernel: [drm:drm_add_edid_modes [drm]] ELD: no CEA Extension found
Jan 13 13:15:09 kernel: [drm:drm_add_display_info [drm]] non_desktop set to 0
Jan 13 13:15:09 kernel: [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:34:VGA-1] probed modes :
Jan 13 13:15:09 kernel: [drm:drm_mode_debug_printmodeline [drm]] Modeline 46:"1920x1200" 60 154000 1920 1968 2000 2080 1200 1203 1209 1235 0x48 0x9
Jan 13 13:15:09 kernel: [drm:drm_mode_debug_printmodeline [drm]] Modeline 48:"1600x1200" 60 162000 1600 1664 1856 2160 1200 1201 1204 1250 0x40 0x5
Jan 13 13:15:09 kernel: [drm:drm_mode_debug_printmodeline [drm]] Modeline 50:"1680x1050" 60 146250 1680 1784 1960 2240 1050 1053 1059 1089 0x40 0x6
Jan 13 13:15:09 kernel: [drm:drm_mode_debug_printmodeline [drm]] Modeline 55:"1280x1024" 75 135000 1280 1296 1440 1688 1024 1025 1028 1066 0x40 0x5
Jan 13 13:15:09 kernel: [drm:drm_mode_debug_printmodeline [drm]] Modeline 47:"1280x1024" 60 108000 1280 1328 1440 1688 1024 1025 1028 1066 0x40 0x5
Jan 13 13:15:09 kernel: [drm:drm_mode_debug_printmodeline [drm]] Modeline 49:"1152x864" 75 108000 1152 1216 1344 1600 864 865 868 900 0x40 0x5
Jan 13 13:15:09 kernel: [drm:drm_mode_debug_printmodeline [drm]] Modeline 56:"1024x768" 75 78750 1024 1040 1136 1312 768 769 772 800 0x40 0x5
Jan 13 13:15:09 kernel: [drm:drm_mode_debug_printmodeline [drm]] Modeline 57:"1024x768" 60 65000 1024 1048 1184 1344 768 771 777 806 0x40 0xa
Jan 13 13:15:09 kernel: [drm:drm_mode_debug_printmodeline [drm]] Modeline 58:"800x600" 75 49500 800 816 896 1056 600 601 604 625 0x40 0x5
Jan 13 13:15:09 kernel: [drm:drm_mode_debug_printmodeline [drm]] Modeline 51:"800x600" 60 40000 800 840 968 1056 600 601 605 628 0x40 0x5
Jan 13 13:15:09 kernel: [drm:drm_mode_debug_printmodeline [drm]] Modeline 52:"640x480" 75 31500 640 656 720 840 480 481 484 500 0x40 0xa
Jan 13 13:15:09 kernel: [drm:drm_mode_debug_printmodeline [drm]] Modeline 53:"640x480" 60 25175 640 656 752 800 480 490 492 525 0x40 0xa
Jan 13 13:15:09 kernel: [drm:drm_mode_debug_printmodeline [drm]] Modeline 54:"720x400" 70 28320 720 738 846 900 400 412 414 449 0x40 0x6
Jan 13 13:15:09 kernel: [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:36:LVDS-1]
Jan 13 13:15:09 kernel: [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:36:LVDS-1] status updated from unknown to connected
Jan 13 13:15:09 kernel: [drm:drm_do_probe_ddc_edid [drm]] drm: skipping non-existent adapter intel drm LVDSBLC_B
Jan 13 13:15:09 kernel: [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:36:LVDS-1] probed modes :
Jan 13 13:15:09 kernel: [drm:drm_mode_debug_printmodeline [drm]] Modeline 59:"1024x768" 60 65000 1024 1048 1184 1344 768 771 777 806 0x8 0xa
Jan 13 13:15:09 kernel: [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:39:DVI-D-1]
Jan 13 13:15:09 kernel: [drm:drm_do_probe_ddc_edid [drm]] drm: skipping non-existent adapter intel drm HDMIB
Jan 13 13:15:09 kernel: [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:39:DVI-D-1] status updated from unknown to disconnected
Jan 13 13:15:09 kernel: [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:39:DVI-D-1] disconnected
Jan 13 13:15:09 kernel: [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:41:DP-1]
Jan 13 13:15:09 kernel: [drm:cdv_intel_dp_aux_ch [gma500_gfx]] dp_aux_ch timeout status 0x51440064
Jan 13 13:15:09 kernel: [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:41:DP-1] status updated from unknown to disconnected
Jan 13 13:15:09 kernel: [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:41:DP-1] disconnected
Jan 13 13:15:09 kernel: [drm:drm_setup_crtcs [drm_kms_helper]] connector 34 enabled? yes
Jan 13 13:15:09 kernel: [drm:drm_setup_crtcs [drm_kms_helper]] connector 36 enabled? yes
Jan 13 13:15:09 kernel: [drm:drm_setup_crtcs [drm_kms_helper]] connector 39 enabled? no
Jan 13 13:15:09 kernel: [drm:drm_setup_crtcs [drm_kms_helper]] connector 41 enabled? no
Jan 13 13:15:09 kernel: [drm:drm_setup_crtcs [drm_kms_helper]] looking for cmdline mode on connector 34
Jan 13 13:15:09 kernel: [drm:drm_setup_crtcs [drm_kms_helper]] looking for preferred mode on connector 34 0
Jan 13 13:15:09 kernel: [drm:drm_setup_crtcs [drm_kms_helper]] found mode 1920x1200
Jan 13 13:15:09 kernel: [drm:drm_setup_crtcs [drm_kms_helper]] looking for cmdline mode on connector 36
Jan 13 13:15:09 kernel: [drm:drm_setup_crtcs [drm_kms_helper]] looking for preferred mode on connector 36 0
Jan 13 13:15:09 kernel: [drm:drm_setup_crtcs [drm_kms_helper]] found mode 1024x768
Jan 13 13:15:09 kernel: [drm:drm_setup_crtcs [drm_kms_helper]] picking CRTCs for 4096x4096 config
Jan 13 13:15:09 kernel: [drm:drm_setup_crtcs [drm_kms_helper]] desired mode 1920x1200 set on crtc 29 (0,0)
Jan 13 13:15:09 kernel: [drm:drm_setup_crtcs [drm_kms_helper]] desired mode 1024x768 set on crtc 31 (0,0)
Jan 13 13:15:09 kernel: [drm:cdv_get_max_backlight [gma500_gfx]] LVDS Panel PWM value is 0!
Jan 13 13:15:09 kernel: [drm:cdv_get_max_backlight [gma500_gfx]] LVDS Panel PWM value is 0!
Jan 13 13:15:09 kernel: [drm] Initialized gma500 1.0.0 20140314 for 0000:00:02.0 on minor 0
Jan 13 13:16:17 kernel: [drm:drm_helper_hpd_irq_event [drm_kms_helper]] [CONNECTOR:34:VGA-1] status updated from connected to connected
Jan 13 13:16:17 kernel: [drm:drm_helper_hpd_irq_event [drm_kms_helper]] [CONNECTOR:39:DVI-D-1] status updated from disconnected to connected
Jan 13 13:16:17 kernel: [drm:cdv_intel_dp_aux_ch [gma500_gfx]] dp_aux_ch timeout status 0x51440064
Jan 13 13:16:17 kernel: [drm:drm_helper_hpd_irq_event [drm_kms_helper]] [CONNECTOR:41:DP-1] status updated from disconnected to disconnected
Jan 13 13:16:37 kernel: [drm:drm_helper_hpd_irq_event [drm_kms_helper]] [CONNECTOR:34:VGA-1] status updated from connected to connected
Jan 13 13:16:37 kernel: [drm:drm_helper_hpd_irq_event [drm_kms_helper]] [CONNECTOR:39:DVI-D-1] status updated from connected to connected
Jan 13 13:16:37 kernel: [drm:cdv_intel_dp_aux_ch [gma500_gfx]] dp_aux_ch timeout status 0x51440064
Jan 13 13:16:37 kernel: [drm:drm_helper_hpd_irq_event [drm_kms_helper]] [CONNECTOR:41:DP-1] status updated from disconnected to disconnected
Comment 1 Dominik 'Rathann' Mierzejewski 2019-01-13 21:52:16 UTC
Downstream (Fedora) bug report: https://bugzilla.redhat.com/show_bug.cgi?id=1665766 .
Comment 2 Martin Peres 2019-11-19 08:53:40 UTC
-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been closed from further activity.

You can subscribe and participate further through the new bug through this link to our GitLab instance: https://gitlab.freedesktop.org/drm/misc/issues/3.


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