How to debug weston fail on QXP B0 device

[nxf45220]

Hi Community team,

BACKGROUND: customer(HYUNDAI MOBIS) reported display issue on their module.

I found there is issue on weston service init during bootup, and this issue is Linux OS version dependency. When failure occurred, there is no display, but when log into system and use command 'systemctl restart weston' to reset weston service, the display is ok then.

Please check below table for more details.

Linux OS version	Failed log during boot	Failure rate
Linux version 4.14.78-imx_4.14.78_1.0.0_ga+g66620c3	Stopped User Manager for UID 0	7/10
Linux version 4.14.98-imx_4.14.98_2.0.0_ga+g5d6cbea	Good	0
Linux version 4.19.35-1.1.0+g0f9917c56d59	Good	0
Linux version 5.4.3-2.0.0+gfd263a3edd95	Good	0
Linux version 5.10.35-lts-5.10.y+gef3f2cfc6010	Failed to start Weston, a …mpositor, as a system service.	8/10

I am wondering if there is any timing issue for different drivers versions which can lead this problem, please kindly suggest.

If we can confirm there is a kind of workaround in SW to fix this issue(rather than a silicon defect), then we can give customer some advise to optimize their SW accordingly.

Contact me freely if any details needed, thanks in advance!

Daniel

[joanxie]

how to reproduce this issue? pls send the test steps to me, for 5.10.35 with weston issue, pls send the log file to me too

[nxf45220]

Hi Joan,

No more tests is needed to reproduce the failure. After system bootup, dumped weston service log(see attached), please kindly comment on that.

Based on our debug history, many issue customer reported can be fixed by higher OS version since we upgrade or optimize lots of settings in latest OS version. This is what I am trying to do to handle this case with your help, and I don't think you can reproduce this issue at your end. 

Feel free to share your comments.

Daniel

[joanxie]

I tested 4.14.78 with QXP B0 board, I couldn't reproduce your issue, see my logfile:

[ OK ] Started Getty on tty1.
[ OK ] Started Serial Getty on ttyLP0.
Starting Weston Wayland Compositor (on tty7)...
[ OK ] Started Save/Restore Sound Card State.
[ OK ] Started Load/Save Screen Backlight …ess of backlight:lvds_backlight@1.
[ OK ] Started Load/Save Screen Backlight …ess of backlight:lvds_backlight@0.
[ OK ] Started Weston Wayland Compositor (on tty7).
[ OK ] Started WPA supplicant.
[ OK ] Started Hostname Service.
[ OK ] Started Kernel Logging Service.
[ OK ] Created slice User Slice of root.
Starting User Manager for UID 0...
[ 7.972899] audit: type=1006 audit(1543187062.176:2): pid=3781 uid=0 old-auid=4294967295 auid=0 tty=(none) old-ses=4294967295 ses=1 res=1
[ OK ] Reached target Sound Card.
[ OK ] Started Session c1 of user root.
[ OK ] Started User Manager for UID 0.

NXP i.MX Release Distro 4.14-sumo imx8qxpmek ttyLP0