Randomly black screen on boot
Submitted by Andriy Sa
Assigned to Manasi Navare @mdnavare
Link to original bug (#107033)
Description
Created attachment 140328
dmesg fail drm-tip
Hello,
The machine randomly start with black screen (there are park of this machines. Some of them work OK, some have issue and some have issue more often)
after again reboot it may be Ok or may be fail and start only after 3-th time
some times every restart is ok (10..20 in a row)
System work and I have access over ssh
According to dmesg, the eDP port can not turn on the power and switch to HDMI-A-2
[ 2.418002] [drm:intel_dp_init_panel_power_sequencer_registers [i915]] panel power sequencer register settings: PP_ON 0x87d00001, PP_OFF 0x1f40001, PP_DIV 0x270f06
[ 2.418059] [drm:edp_panel_vdd_on [i915]] Turning eDP port C VDD on
[ 2.418114] [drm:edp_panel_vdd_on [i915]] PP_STATUS: 0x80000008 PP_CONTROL: 0xabcd000b
[ 2.420630] [drm:intel_dp_aux_xfer [i915]] dp_aux_ch timeout status 0x70150064
[ 2.423130] [drm:intel_dp_aux_xfer [i915]] dp_aux_ch timeout status 0x70150064
...
[ 2.498094] [drm:drm_dp_dpcd_access [drm_kms_helper]] Too many retries, giving up. First error: -110
[ 2.498096] [drm] failed to retrieve link info, disabling eDP
-- chipset: Intel(R) Celeron(R) CPU N3060
Gigabyte Technology Co., Ltd. N3060TN-EM
Intel Corporation Device 22b1 (rev 35) (prog-if 00 [VGA controller])
-- system architecture: x86_64
-- kernel: 4.10 4.16 4.18(drm-tip/2018-06-23)
-- Linux distribution: Ubuntu 16.04
-- Display connector: eDP
cat /sys/class/drm/card0/error - is empty
On normal boot
ls -l /sys/class/drm/card0/
total 0
drwxr-xr-x 5 root root 0 Jun 25 14:07 card0-DP-1
drwxr-xr-x 6 root root 0 Jun 25 14:07 card0-eDP-1
drwxr-xr-x 3 root root 0 Jun 25 14:07 card0-HDMI-A-1
...
On black screen
ls -l /sys/class/drm/card0/
total 0
drwxr-xr-x 5 root root 0 Jun 25 13:04 card0-DP-1
drwxr-xr-x 3 root root 0 Jun 25 13:04 card0-HDMI-A-1
drwxr-xr-x 3 root root 0 Jun 25 13:04 card0-HDMI-A-2
...
Attachment 140328, "dmesg fail drm-tip":
dmesg_4.18_fail