Hi,
Since 6.8-rc1 the internal eDP display on the Lenovo ThinkPad X13s does
not always show up on boot.
The logs indicate problems with the runtime PM and eDP rework that went
into 6.8-rc1:
[ 6.006236] Console: switching to colour dummy device 80x25
[ 6.007542] [drm:dpu_kms_hw_init:1048] dpu hardware
revision:0x80000000
[ 6.007872] [drm:drm_bridge_attach [drm]] *ERROR* failed to attach
bridge /soc@0/phy@88eb000 to encoder TMDS-31: -16
[ 6.007934] [drm:dp_bridge_init [msm]] *ERROR* failed to attach
panel bridge: -16
[ 6.007983] msm_dpu ae01000.display-controller:
[drm:msm_dp_modeset_init [msm]] *ERROR* failed to create dp bridge: -16
[ 6.008030] [drm:_dpu_kms_initialize_displayport:588] [dpu
error]modeset_init failed for DP, rc = -16
[ 6.008050] [drm:_dpu_kms_setup_displays:681] [dpu
error]initialize_DP failed, rc = -16
[ 6.008068] [drm:dpu_kms_hw_init:1153] [dpu error]modeset init
failed: -16
[ 6.008388] msm_dpu ae01000.display-controller:
[drm:msm_drm_kms_init [msm]] *ERROR* kms hw init failed: -16
and this can also manifest itself as a NULL-pointer dereference:
[ 7.339447] Unable to handle kernel NULL pointer dereference at
virtual address 0000000000000000
[ 7.643705] pc : drm_bridge_attach+0x70/0x1a8 [drm]
[ 7.686415] lr : drm_aux_bridge_attach+0x24/0x38 [aux_bridge]
[ 7.769039] Call trace:
[ 7.771564] drm_bridge_attach+0x70/0x1a8 [drm]
[ 7.776234] drm_aux_bridge_attach+0x24/0x38 [aux_bridge]
[ 7.781782] drm_bridge_attach+0x80/0x1a8 [drm]
[ 7.786454] dp_bridge_init+0xa8/0x15c [msm]
[ 7.790856] msm_dp_modeset_init+0x28/0xc4 [msm]
[ 7.795617] _dpu_kms_drm_obj_init+0x19c/0x680 [msm]
[ 7.800731] dpu_kms_hw_init+0x348/0x4c4 [msm]
[ 7.805306] msm_drm_kms_init+0x84/0x324 [msm]
[ 7.809891] msm_drm_bind+0x1d8/0x3a8 [msm]
[ 7.814196] try_to_bring_up_aggregate_device+0x1f0/0x2f8
[ 7.819747] __component_add+0xa4/0x18c
[ 7.823703] component_add+0x14/0x20
[ 7.827389] dp_display_probe+0x47c/0x568 [msm]
[ 7.832052] platform_probe+0x68/0xd8
Users have also reported random crashes at boot since 6.8-rc1, and I've
been able to trigger hard crashes twice when testing an external display
(USB-C/DP), which may also be related to the DP regressions.
I've opened an issue here:
https://gitlab.freedesktop.org/drm/msm/-/issues/51
but I also want Thorsten's help to track this so that it gets fixed
before 6.8 is released.
#regzbot introduced: v6.7..v6.8-rc1
The following series is likely the culprit:
https://lore.kernel.org/all/[email protected]/
Johan
