| Summary: | [drm][amdgpu][CIK] drm_sysfs_connector - BUG: unable to handle kernel NULL pointer dereference at 0000000000000038 | ||||||||||
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| Product: | DRI | Reporter: | Shawn Starr <shawn.starr> | ||||||||
| Component: | DRM/AMDgpu | Assignee: | Default DRI bug account <dri-devel> | ||||||||
| Status: | RESOLVED FIXED | QA Contact: | |||||||||
| Severity: | normal | ||||||||||
| Priority: | medium | ||||||||||
| Version: | unspecified | ||||||||||
| Hardware: | Other | ||||||||||
| OS: | All | ||||||||||
| Whiteboard: | |||||||||||
| i915 platform: | i915 features: | ||||||||||
| Attachments: |
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Adding some debug when not using Switchable Graphics: [ 10.048669] [drm] amdgpu_connector_add(): dp bridge encoder name: 0x1e [ 10.048672] [drm] amdgpu_connector_add() no dp_bridge: connecter_type found: 7 [ 10.048684] [drm] forcing LVDS-1 connector OFF [ 10.048721] [drm] amdgpu_connector_add(): dp bridge encoder name: 0x20 [ 10.048724] [drm] amdgpu_connector_add() no dp_bridge: connecter_type found: 10 [ 10.048811] [drm] amdgpu_connector_add(): dp bridge encoder name: 0x20 [ 10.048814] [drm] amdgpu_connector_add() no dp_bridge: connecter_type found: 10 [ 10.048877] [drm] amdgpu_connector_add(): dp bridge encoder name: 0x21 [ 10.048880] [drm] amdgpu_connector_add() no dp_bridge: connecter_type found: 10 [ 10.048933] [drm] amdgpu_connector_add(): dp bridge encoder name: 0x15 [ 10.048937] [drm] amdgpu_connector_add() no dp_bridge: connecter_type found: 1 When using Switchable Graphics: [ X.XXXXXXX] [drm] amdgpu_connector_add(): dp bridge encoder name: 0x1e [ X.XXXXXXX] [drm] amdgpu_connector_add() no dp_bridge: connecter_type found: -16345243 Then we panic/deadlock. amdgpu_atombios_get_connector_info_from_object_table() vs radeon_get_atom_connector_info_from_object_table() Perhaps there's a bug in the parsing? This works fine with radeon.ko. Created attachment 126010 [details] [review] workaround This patch should work around the crash. No idea why the bios is broken in amdgpu and fine on radeon in the switchable gfx case. Created attachment 126011 [details] [review] additional workaround Skip analog TV and CV connectors as the hw doesn't support them. This patch worksaround issue for me thank you Alex for your help on IRC debugging this today *** Bug 96470 has been marked as a duplicate of this bug. *** Workaround committed. |
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Created attachment 125990 [details] Dmesg of kernel bootup - 4.7.0 kernel When trying to enable Switchable Graphics, I am unable to bootup. With 4.7.0 it booted but no X display could start With 4.8-rcX it deadlocks on bootup now. 1) If the LCD (LVDS) display lid is open, no such kernel panic message is displayed and deadlocks bootup. 2) It the lid is closed, a panic message is shown (and deadlocks bootup). Trying to enable PRIME on AMDGPU with CIK experimental enabled fails. attached to this BZ is dmesg of oops from 4.7.0 kernel, the stack is the same for 4.8-rcX. PRIME has never worked for me on AMDGPU it has worked on regular radeon however.