[Bug 109398] New: booting gives black screen [drm:intel_dp_start_link_train] [CONNECTOR:67:eDP-1] Link Training failed at link rate = 162000, lane count = 2

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109398

            Bug ID: 109398
           Summary: booting gives black screen
                    [drm:intel_dp_start_link_train] [CONNECTOR:67:eDP-1]
                    Link Training failed at link rate = 162000, lane count
                    = 2
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: blocker
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: seppe.hoogzaad at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 143169
  --> https://bugs.freedesktop.org/attachment.cgi?id=143169&action=edit
log files and computer information

Booting gives black screen with flickering. No recovery possible.


I am using the 5.0.0-rc2 kernel from:
> git clone git://anongit.freedesktop.org/drm-tip
I have incuded a WiFi driver and btrfs to the .config made with "make
defconfig".


I have used the "splash=silent quiet showopts drm.debug=0xe log_buf_len=4M"
kernel parameter to boot. The kernel boots into a flashing screen and the
computer can not be used. No image is visable. Text terminals (ctrl-alt-F1)
are also not visable. The flickering is mostly at the bottem of the screen,
once every two seconds (or something like that time).

The exact proces is the following:
- grub loads
- the kernel boots
- screen goes black, start flashing. White flashes about every second.
- the Opensuse tumblewheet logo appears which shows motion
- screen goes black with small flashes of white at the bottem of the screen.


This behavior is not present when running the opensuse leap 15.0 kernel :
kernel-default-4.12.14-lp150.11.4.x86_64.rpm
http://download.opensuse.org/distribution/leap/15.0/repo/oss/x86_64/kernel-default-4.12.14-lp150.11.4.x86_64.rpm.mirrorlist

I also made a commend about this bug at
https://bugzilla.suse.com/show_bug.cgi?id=1119621#c15
Since i have tested it on the drm-tip kernel, i have reported the (same?) bug
here.  

Note that the hardware i am using is a chromebook (Dell). The firmware is
having bugs, which i can not solve. This can also interfere here. 


In the logs is a file i made after the next (normal) boot:
# sudo journalctl --boot=-1 > journalctl_boot.txt

I could not make contact with the machine remotely, since wifi did not came
up. I therefore could only make a log afterwards. Additional log files are
therefore not included.

In the 'journalctl_boot.txt' i see the following line repeatetly:
[drm:intel_dp_start_link_train] [CONNECTOR:67:eDP-1] Link Training failed at
link rate = 162000, lane count = 2
This with a whole lot of other lines. There is no clear error or warning in
the log.


Included is also a file "dmesg_before.txt". This is from a boot when
additionaly
the "i915.fastboot=1" kernel parameter is set. Then the computer boots
correct. This file is the same as the file included in an other
bug-report. There the command "xset dpms force off" triggers the same
state. The file "dmesg_before.txt" is from before that command is given, thus
is from a normal running state.

Also includes are the machine info and lspci info, made when the machine is
running with the "i915.fastboot=1" kernel parameter set.


> inxi -bxx
System:    Host: linux-6axq Kernel: 5.0.0-rc2test-g1fb7b31e074e x86_64 bits: 64
compiler: gcc v: 8.2.1 Console: N/A 
           dm: LightDM Distro: openSUSE Tumbleweed 20190115 
Machine:   Type: Desktop System: GOOGLE product: Lulu v: Pilot serial:
123456789 Chassis: type: 3 serial: N/A 
           Mobo: N/A model: N/A serial: N/A BIOS: coreboot v: N/A date:
03/28/2016 
Battery:   ID-1: BAT0 charge: 41.2 Wh condition: 70.1/67.0 Wh (105%) volts:
11.6/11.4 model: SMP-LIS DELL MJ serial: 0340 
           status: Discharging 
CPU:       Dual Core: Intel Core i3-5005U type: MT MCP arch: Broadwell speed:
1743 MHz min/max: 500/2000 MHz 
Graphics:  Device-1: Intel HD Graphics 5500 driver: i915 v: kernel bus ID:
00:02.0 chip ID: 8086:1616 
           Display: server: X.org 1.20.3 driver: intel tty: 180x31 
           Message: Advanced graphics data unavailable in console for root. 
Network:   Device-1: Intel Wireless 7260 driver: iwlwifi v: kernel port: 1840
bus ID: 01:00.0 chip ID: 8086:08b1 
Drives:    Local Storage: total: 111.79 GiB used: 71.60 GiB (64.0%) 
Info:      Processes: 189 Uptime: N/A Memory: 3.78 GiB used: 410.2 MiB (10.6%)
Init: systemd v: 239 runlevel: 5 
           target: graphical.target Compilers: gcc: 8.2.1 alt: 8 Shell:
dump-info-befor inxi: 3.0.29

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