[yocto] yocto touchscreen

Tue Apr 16 03:09:31 PDT 2019

Hello Zoran

I tried to change screen resolution with xrandr to change the screen resolution to 480x272 (it is the screen resolution of the touchscreen) but it’s changes nothing screen resolution seems to stay to 1024x768

I defined on the device tree the screen resolution but it’s like it was not taken in account

Here is the definition of the touchscreen resolution in the device tree :

                               display-timings {

                                               480x272 {

                                                               hactive                 = <480>;

                                                               vactive                 = <272>;

                                                               hback-porch      = <43>;

                                                               hfront-porch     = <8>;

                                                               hsync-len            = <4>;

                                                               vback-porch      = <12>;

                                                               vfront-porch     = <4>;

                                                               vsync-len            = <10>;

                                                               clock-frequency = <9000000>;

                                                               hsync-active      = <0>;

                                                               vsync-active      = <0>;

                                               };

I use a DTB file from krogoth version, because, I tried to use the DTB file generated for sumo thud and warrior version but it’s didn’t work.

I only update files in rootfs partition (with developed versions) and not boot partition

While boot process is running, the splashscreen appear correctly, but immediately when the terminal session appears, the touchscreen lock.

Here is what is in Xorg.0.log

root at am335x-evm:~# cat /var/log/Xorg.0.log

[    15.212]

X.Org X Server 1.20.4

X Protocol Version 11, Revision 0

[    15.212] Build Operating System: Linux 4.15.0-45-generic x86_64

[    15.212] Current Operating System: Linux am335x-evm 4.4.19-ge581bb1cac #1 PREEMPT Thu May 24 11:42:17 CEST 2018 armv7l

[    15.213] Kernel command line: console=ttyO0,115200 root=/dev/mmcblk0p2 rw

[    15.213] Build Date: 10 April 2019  08:15:46PM

[    15.213]

[    15.213] Current version of pixman: 0.38.0

[    15.213]    Before reporting problems, check http://wiki.x.org

        to make sure that you have the latest version.

[    15.213] Markers: (--) probed, (**) from config file, (==) default setting,

        (++) from command line, (!!) notice, (II) informational,

        (WW) warning, (EE) error, (NI) not implemented, (??) unknown.

[    15.213] (==) Log file: "/var/log/Xorg.0.log", Time: Thu Apr 11 15:51:53 2019

[    15.219] (==) Using config file: "/etc/X11/xorg.conf"

[    15.219] (==) Using system config directory "/usr/share/X11/xorg.conf.d"

[    15.235] (==) ServerLayout "Builtin Default Layout"

[    15.235] (**) |-->Screen "Builtin Default fbdev Screen 0" (0)

[    15.235] (**) |   |-->Monitor "Builtin Default Monitor"

[    15.237] (**) |   |-->Device "Builtin Default fbdev Device 0"

[    15.237] (==) Automatically adding devices

[    15.237] (==) Automatically enabling devices

[    15.237] (==) Automatically adding GPU devices

[    15.237] (==) Max clients allowed: 256, resource mask: 0x1fffff

[    15.238] (WW) The directory "/usr/share/fonts/X11/misc/" does not exist.

[    15.238]    Entry deleted from font path.

[    15.239] (WW) The directory "/usr/share/fonts/X11/TTF/" does not exist.