Error occurred when run application with -platform eglfs

victor wang · wrote on 4 Dec 2018, 06:26

I'm using Yocto Project 2.4 with QT 5.8 and i.MX6 Quad sabreSD platform.

After I build image with no wayland and X11, I tried to run my application with below command.

./Qt5_CinematicExperience -platform eglfs

Unfortunately, I had occurred an error like below.

root@imx6qsabresd:/home# Qt5_CinematicExperience -platform eglfs
QEglFSVivIntegration will set environment variable FB_MULTI_BUFFER=2 to     enable d
ouble buffering and vsync.
 If this is not desired, you can override this via: export     QT_EGLFS_IMX6_NO_FB_M
ULTI_BUFFER=1
forenex victor ldb diabled LVDS backlight get = 0
ldb_disable(687) forenex victor  LVDS ldb->ctrl=[693]
ldb_disable(688) forenex victor  LVDS ldb->spl_mode=[1]
ldb_disable(689) forenex victor  LVDS ldb->dual_mode=[0]
ldb_disable(690) forenex victor  LVDS ldb->ctrl_reg=[8]
ldb_disable(703) forenex victor  LVDS ldb->ctrl=[688]
/mnt/raid/forenex/yocto2.4/build-wayland-q/tmp/work-    shared/imx6qsabresd/kernel-s
ource/drivers/video/fbdev/mxc/ldb.c_ldb_enable(623) forenex victor  LVDS     tmp_ctr
l=[2b0]
/mnt/raid/forenex/yocto2.4/build-wayland-q/tmp/work-    shared/imx6qsabresd/kernel-s
ource/drivers/video/fbdev/mxc/ldb.c_ldb_enable(658) forenex victor  LVDS     ldb->ct
rl=[2b5]
[     1] Failed to open device: No such file or directory, Try again...
[     2] Failed to open device: No such file or directory, Try again...
[     3] Failed to open device: No such file or directory, Try again...
[     4] Failed to open device: No such file or directory, Try again...
[     5] _OpenDevice(1090): FATAL: Failed to open device, errno=No such file     or
directory.
forenex victor ldb diabled LVDS backlight get = 0
ldb_disable(687) forenex victor  LVDS ldb->ctrl=[693]
ldb_disable(688) forenex victor  LVDS ldb->spl_mode=[1]
ldb_disable(689) forenex victor  LVDS ldb->dual_mode=[0]
ldb_disable(690) forenex victor  LVDS ldb->ctrl_reg=[8]
ldb_disable(703) forenex victor  LVDS ldb->ctrl=[688]
/mnt/raid/forenex/yocto2.4/build-wayland-q/tmp/work-    shared/imx6qsabresd/kernel-s
ource/drivers/video/fbdev/mxc/ldb.c_ldb_enable(623) forenex victor  LVDS     tmp_ctr
l=[2b0]
/mnt/raid/forenex/yocto2.4/build-wayland-q/tmp/work-    shared/imx6qsabresd/kernel-s
ource/drivers/video/fbdev/mxc/ldb.c_ldb_enable(658) forenex victor  LVDS     ldb->ct
rl=[2b5]
[     6] Failed to open device: No such file or directory, Try again...
[     7] Failed to open device: No such file or directory, Try again...
[     8] Failed to open device: No such file or directory, Try again...
[     9] Failed to open device: No such file or directory, Try again...
[    10] _OpenDevice(1090): FATAL: Failed to open device, errno=No such file     or
directory.
root@imx6qsabresd:/home#

It failed to open some devices.

I also export some parameter with below command.

export QT_QPA_EGLFS_FB=/dev/fb0

And it still show the same error.

How can I solve this problem?