Tslib - ts_calibrate sometimes shows blank screen, sometimes shows crosshairs screen

I followed the routine listed at the following link to calibrate my Toradex resistive touch display.
https://www.toradex.com/community/questions/12437/using-resistve-touch-on-qt-for-device-creation-59.html

And it worked, mostly.

Some calls to ts_calibrate (from a bash shell) will return the proper crosshair screen shown and discussed at:

Other times it will yield a blank screen with no crosshairs. However, when the screen is blank it does seem to be doing something because it updates the calibration file after the standard 5 touches to the screen (one in each corner and one in the middle).

Any thoughts on what is happening?

Please provide Boot2Qt image version number.

I am using Boot2Qt 5.15.0 Toradex Apalis iMX6.

If Qt appcontroller is running it will interfere with ts_calibrate .
Do a

root@b2qt-apalis-imx6:~# appcontroller --stop

before ts_calibrate

That didn’t seem to help. I still sometimes get a blank screen after stopping the appcontroller.

However, as before, the process seems to be running to some degree. I see the following updates at the bash shell if I blindly press the four corners and the center of the screen. (UL, UR, LR, LL, C)

root@b2qt-apalis-imx6:/usr/bin# ts_calibrate

xres = 800, yres = 480

Took 7 samples…

Top left : X = 289 Y = 3525

Took 8 samples…

Top right : X = 3806 Y = 3528

Took 8 samples…

Bot right : X = 3762 Y = 692

Took 6 samples…

Bot left : X = 321 Y = 485

Took 4 samples…

Center : X = 2189 Y = 2010

-16.201782 0.200911 -0.000179

496.649170 0.003792 -0.129156

Calibration constants: -1061800 13166 -11 32548400 248 -8464 65536

Hi @rkPolarDev

Can you show the ouptut of “ps auxf”?

ps auxf

Also try to stop qtlauncher entirely:

systemctl stop qtlauncher
systemctl disable qtlauncher
reboot

If you are done with calibration you can enable it again:

systemctl enable qtlauncher
reboot

Regards,
Stefan

ps auxf yields:

root@b2qt-apalis-imx6:/usr/bin# ps auxf
USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
root         2  0.0  0.0      0     0 ?        S    10:35   0:00 [kthreadd]
root         3  0.0  0.0      0     0 ?        I    10:35   0:00  \_ [kworker/0:0]
root         5  0.0  0.0      0     0 ?        I    10:35   0:00  \_ [kworker/u8:0]
root         6  0.0  0.0      0     0 ?        I<   10:35   0:00  \_ [mm_percpu_wq]
root         7  0.0  0.0      0     0 ?        S    10:35   0:00  \_ [ksoftirqd/0]
root         8  0.0  0.0      0     0 ?        I    10:35   0:00  \_ [rcu_sched]
root         9  0.0  0.0      0     0 ?        I    10:35   0:00  \_ [rcu_bh]
root        10  0.0  0.0      0     0 ?        S    10:35   0:00  \_ [migration/0]
root        11  0.0  0.0      0     0 ?        S    10:35   0:00  \_ [cpuhp/0]
root        12  0.0  0.0      0     0 ?        S    10:35   0:00  \_ [cpuhp/1]
root        13  0.0  0.0      0     0 ?        S    10:35   0:00  \_ [migration/1]
root        14  0.0  0.0      0     0 ?        S    10:35   0:00  \_ [ksoftirqd/1]
root        17  0.0  0.0      0     0 ?        S    10:35   0:00  \_ [cpuhp/2]
root        18  0.0  0.0      0     0 ?        S    10:35   0:00  \_ [migration/2]
root        19  0.0  0.0      0     0 ?        S    10:35   0:00  \_ [ksoftirqd/2]
root        22  0.0  0.0      0     0 ?        S    10:35   0:00  \_ [cpuhp/3]
root        23  0.0  0.0      0     0 ?        S    10:35   0:00  \_ [migration/3]
root        24  0.0  0.0      0     0 ?        S    10:35   0:00  \_ [ksoftirqd/3]
root        26  0.0  0.0      0     0 ?        I<   10:35   0:00  \_ [kworker/3:0H]
root        27  0.0  0.0      0     0 ?        S    10:35   0:00  \_ [kdevtmpfs]
root        28  0.0  0.0      0     0 ?        I<   10:35   0:00  \_ [netns]
root        29  0.0  0.0      0     0 ?        I    10:35   0:00  \_ [kworker/1:1]
root        30  0.0  0.0      0     0 ?        I    10:35   0:00  \_ [kworker/0:1]
root        31  0.0  0.0      0     0 ?        I    10:35   0:00  \_ [kworker/2:1]
root        32  0.0  0.0      0     0 ?        I    10:35   0:00  \_ [kworker/3:1]
root        33  0.0  0.0      0     0 ?        S    10:35   0:00  \_ [oom_reaper]
root        34  0.0  0.0      0     0 ?        I<   10:35   0:00  \_ [writeback]
root        35  0.0  0.0      0     0 ?        S    10:35   0:00  \_ [kcompactd0]
root        36  0.0  0.0      0     0 ?        I<   10:35   0:00  \_ [crypto]
root        37  0.0  0.0      0     0 ?        I<   10:35   0:00  \_ [kblockd]
root        38  0.0  0.0      0     0 ?        I<   10:35   0:00  \_ [ata_sff]
root        39  0.0  0.0      0     0 ?        S    10:35   0:00  \_ [irq/197-stmpe]
root        40  0.0  0.0      0     0 ?        S    10:35   0:00  \_ [ipu1_task]
root        41  0.0  0.0      0     0 ?        S    10:35   0:00  \_ [ipu1_task]
root        42  0.0  0.0      0     0 ?        S    10:35   0:00  \_ [ipu2_task]
root        43  0.0  0.0      0     0 ?        S    10:35   0:00  \_ [ipu2_task]
root        44  0.0  0.0      0     0 ?        I<   10:35   0:00  \_ [watchdogd]
root        45  0.0  0.0      0     0 ?        S    10:35   0:00  \_ [cfinteractive]
root        46  0.0  0.0      0     0 ?        I<   10:35   0:00  \_ [rpciod]
root        47  0.0  0.0      0     0 ?        I<   10:35   0:00  \_ [xprtiod]
root        48  0.0  0.0      0     0 ?        S    10:35   0:00  \_ [kswapd0]
root        49  0.0  0.0      0     0 ?        I<   10:35   0:00  \_ [nfsiod]
root        50  0.0  0.0      0     0 ?        I<   10:35   0:00  \_ [cifsiod]
root        51  0.0  0.0      0     0 ?        I<   10:35   0:00  \_ [cifsoplockd]
root       101  0.0  0.0      0     0 ?        S    10:35   0:00  \_ [scsi_eh_0]
root       102  0.0  0.0      0     0 ?        I<   10:35   0:00  \_ [scsi_tmf_0]
root       106  0.0  0.0      0     0 ?        I<   10:35   0:00  \_ [ci_otg]
root       107  0.0  0.0      0     0 ?        I<   10:35   0:00  \_ [ci_power_lost]
root       108  0.0  0.0      0     0 ?        I<   10:35   0:00  \_ [ci_power_lost]
root       109  0.0  0.0      0     0 ?        S    10:35   0:00  \_ [irq/71-mmc0]
root       110  0.0  0.0      0     0 ?        S    10:35   0:00  \_ [irq/207-2190000]
root       111  0.0  0.0      0     0 ?        S    10:35   0:00  \_ [irq/72-mmc2]
root       112  0.0  0.0      0     0 ?        I    10:35   0:00  \_ [kworker/2:2]
root       113  0.0  0.0      0     0 ?        I<   10:35   0:00  \_ [vpu_wq]
root       114  0.0  0.0      0     0 ?        I    10:35   0:00  \_ [kworker/1:2]
root       115  0.0  0.0      0     0 ?        I<   10:35   0:00  \_ [kworker/1:1H]
root       116  0.0  0.0      0     0 ?        I<   10:35   0:00  \_ [kworker/0:1H]
root       171  0.0  0.0      0     0 ?        I<   10:35   0:00  \_ [ipv6_addrconf]
root       172  0.0  0.0      0     0 ?        S    10:35   0:00  \_ [irq/56-imx_ther]
root       174  0.0  0.0      0     0 ?        I<   10:35   0:00  \_ [kworker/1:2H]
root       175  0.0  0.0      0     0 ?        I<   10:35   0:00  \_ [kworker/0:2H]
root       176  0.0  0.0      0     0 ?        S    10:35   0:00  \_ [jbd2/mmcblk2p2-]
root       177  0.0  0.0      0     0 ?        I<   10:35   0:00  \_ [ext4-rsv-conver]
root       184  0.0  0.0      0     0 ?        I<   10:35   0:00  \_ [kworker/2:1H]
root       190  0.0  0.0      0     0 ?        I<   10:35   0:00  \_ [kworker/3:2H]
root       191  0.0  0.0      0     0 ?        I<   10:35   0:00  \_ [kworker/2:2H]
root       212  0.0  0.0      0     0 ?        I<   10:35   0:00  \_ [galcore workque]
root       233  0.0  0.0      0     0 ?        S    10:35   0:00  \_ [Vivante Kernel ]
root       234  0.0  0.0      0     0 ?        S    10:35   0:00  \_ [galcore deamon ]
root       235  0.0  0.0      0     0 ?        S    10:35   0:00  \_ [galcore deamon ]
root       236  0.0  0.0      0     0 ?        S    10:35   0:00  \_ [galcore deamon ]
root       238  0.0  0.0      0     0 ?        I    10:35   0:00  \_ [kworker/3:2]
root       243  0.0  0.0      0     0 ?        S    10:35   0:00  \_ [spi0]
root       244  0.0  0.0      0     0 ?        S    10:35   0:00  \_ [spi1]
root       289  0.0  0.0      0     0 ?        S    10:35   0:00  \_ [irq/121-2188000]
root       388  0.0  0.0      0     0 ?        I    10:40   0:00  \_ [kworker/u8:2]
root       392  0.0  0.0      0     0 ?        I    10:47   0:00  \_ [kworker/0:2]
root       401  0.0  0.0      0     0 ?        I<   10:49   0:00  \_ [kworker/3:1H]
root       404  0.0  0.0      0     0 ?        I    10:49   0:00  \_ [kworker/u8:1]
root         1  0.4  0.4  25396  5024 ?        Ss   10:35   0:04 /sbin/init ro,noatime
root       196  0.0  0.0   1624   388 ?        Ss   10:35   0:00 /usr/sbin/rngd -f -r /dev/hwrng
root       198  0.0  0.4  13532  4624 ?        Ss   10:35   0:00 /lib/systemd/systemd-journald
root       215  0.0  0.2  11484  2192 ?        Ss   10:35   0:00 /lib/systemd/systemd-udevd
systemd+   229  0.0  0.1  14740  1476 ?        Ssl  10:35   0:00 /lib/systemd/systemd-timesyncd
root       264  0.0  0.0   2240   432 ?        Ss   10:35   0:00 /sbin/klogd -n
root       265  0.0  0.0   2240   436 ?        Ss   10:35   0:00 /sbin/syslogd -n
message+   266  0.0  0.2   3364  2104 ?        Ss   10:35   0:00 /usr/bin/dbus-daemon --system --address=systemd: --nofork --nopidfile --systemd-activation --syslo
root       275  0.0  0.3   8704  4084 ?        Ss   10:35   0:00 /usr/sbin/connmand -n
root       277  0.0  0.1   5200  1292 ?        Ss   10:35   0:00 /lib/systemd/systemd-logind
root       288  0.0  0.3   8392  3552 ?        Ss   10:35   0:00 /usr/sbin/wpa_supplicant -u
root       294  0.0  0.1   3544  1100 tty1     Ss+  10:35   0:00 /sbin/agetty -o -p -- \u --noclear tty1 linux
root       295  0.0  0.1   1496  1100 ttymxc0  Ss+  10:35   0:00 /sbin/agetty -8 -L ttymxc0 115200 xterm
root       298  0.0  0.4   6336  4444 ?        Ss   10:35   0:00 /lib/systemd/systemd --user
root       299  0.0  0.1   8148  1288 ?        S    10:35   0:00  \_ (sd-pam)
root       322  0.0  0.7  68756  7760 ?        Sl   10:35   0:00 /usr/bin/qdbd --usb-ethernet-function-name rndis.usb0
systemd+   341  0.0  0.2   5688  2676 ?        Ss   10:35   0:00 /lib/systemd/systemd-networkd
root       365  0.0  0.1   2040  1476 ?        Ss   10:36   0:00 /usr/sbin/dropbear -i -r /etc/dropbear/dropbear_rsa_host_key -B
root       366  0.0  0.6  41104  6180 ?        S    10:36   0:00  \_ /usr/bin/appcontroller /opt/serial-Muxv4/bin/serial-Muxv4
root       369  2.3  4.1 290888 42952 ?        Sl   10:36   0:18      \_ /opt/serial-Muxv4/bin/serial-Muxv4
root       381  0.0  0.1   2040  1484 ?        Ss   10:36   0:00 /usr/sbin/dropbear -i -r /etc/dropbear/dropbear_rsa_host_key -B
root       382  0.0  0.2   2620  2104 pts/0    Ss   10:36   0:00  \_ -sh
root       405  0.0  0.1   2472  1356 pts/0    R+   10:49   0:00      \_ ps auxf
root       395  0.4  0.1   2040  1416 ?        Ss   10:48   0:00 /usr/sbin/dropbear -i -r /etc/dropbear/dropbear_rsa_host_key -B
root       396  0.0  0.2   2620  2108 pts/1    Ss+  10:48   0:00  \_ -sh

Also, I did try stopping qtlauncher and rebooting. The unit kicked me out after I entered “reboot”. After it reboot, I ssh’d back into the unit, entered ts_calibrate, got the crosshairs the first time, but blank screen the second two times after that.

The Boot2QT image provided by QT company. Did you try to search for similar problem on their sites/docs?

https://wiki.qt.io/
https://doc.qt.io/qt-5/gettingstarted.html

@alex.tx - I have looked a bit (searched “ts_calibrate”) but have yet to find anything specific to my problem. Given how common this occurs, I am surprised no one else has stumbled across it.

Tried twice to attach my “ps auxf” print but the site removes my response and states the comment needs to be reviewed by a moderator.

Until then, are there specific details in the printout you are looking for that I could examine?

You can download file to our share server and provide a link here.