Public bug reported:
[Impact]
During the cold-boot stress test, DUT did cold boot 30 times successfully,
however, Checkbox found a System service,
systemd-backlight@backlight:1c008000.dsi0.0.service, loaded failed once at the
iteration 9th.
Panel: DSI panel
DTBO: default
[Fix]
(DSI + eDP) is fine because dsi and edp drivers are built-in. when panel driver
is probed, it would try to wake up the parent and since dsi and edp are already
built-in, the brightness function will work without any time gap.
(DSI + HDMI) has the probability to fail because when panel driver is probed,
it would try to wake up the parent, but hdmi driver is modularized, it will
need to wait the hdmi driver to be loaded. the time gap would cause
systemd-backlight service fails.
the workaround fix would be to make the hdmi module built-in.
[Test]
1. Flash genio-core-22-20240802-124.img image
2. Install Checkbox
```
sudo snap install checkbox22 --beta
sudo snap install checkbox-baoshan --edge --devmode
sudo snap install checkbox-ce-oem --channel="uc22/edge" --devmode
sudo snap stop --disable checkbox-ce-oem.remote-slave
sudo snap install bluez
sudo snap install genio-test-tool --devmode
sudo snap install bugit --devmode
```
3. Run cold-boot stress testing via Checkbox Control (Need another device as
Host to run checkbox remotely)
On Host, install and run the following command to test DUT via checkbox
control
```
# Install checkbox on host (suppose your host is jammy)
$ sudo snap install checkbox22 --beta
$ sudo snap install checkbox --channel="22.04/beta" --classic
# test-runner-G350 is a launcher file [1]
$ checkbox.checkbox-cli control <IP of DUT> test-runner-G700
# Choose "genio-baoshan - Stress tests for Ubuntu Core 22" plan
# Choose "Warm-boot Stress Test" plan
```
Checkbox Script [2]
```
sleep "${{STRESS_BOOT_WAIT_DELAY:-120}}"
reboot
```
[1]:
https://git.launchpad.net/~baoshan-team/baoshan/+git/checkbox-baoshan/tree/launchers/test-runner-G700
[2]:
https://github.com/canonical/checkbox/blob/6f1685379562d7076f233112f125478185dcb029/providers/base/units/stress/boot.pxu#L145
[Where problems could occur]
making the module to be built-in should be no harm for the system.
LP: #2076054
** Affects: linux-mtk (Ubuntu)
Importance: Undecided
Assignee: Jian Hui Lee (jianhuilee)
Status: In Progress
** Affects: linux-mtk (Ubuntu Jammy)
Importance: Undecided
Assignee: Jian Hui Lee (jianhuilee)
Status: In Progress
** Changed in: linux-mtk (Ubuntu)
Assignee: (unassigned) => Jian Hui Lee (jianhuilee)
** Also affects: linux-mtk (Ubuntu Jammy)
Importance: Undecided
Status: New
** Changed in: linux-mtk (Ubuntu Jammy)
Assignee: (unassigned) => Jian Hui Lee (jianhuilee)
** Changed in: linux-mtk (Ubuntu)
Status: New => In Progress
** Changed in: linux-mtk (Ubuntu Jammy)
Status: New => In Progress
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https://bugs.launchpad.net/bugs/2078763
Title:
[uc22][g700] systemd-backlight@backlight:1c008000.dsi0.0.service
loaded failed during cold boot stress test
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