Waveshare 7inch HDMI LCD (C) panel

I bought a 7inch HDMI LCD (C) panel

http://www.waveshare.com/7inch-HDMI-LCD-C.htm
and trying to use it with Orange Pi One. All is right, but:

1. the image constantly flickers

2. when the brightness changes, a "ghost" of the old image appears

I use power from PC power supply, yellow line, armbian image is Armbian_5.30_Orangepione_Ubuntu_xenial_default_3.4.113_desktop

Can I do something with my configs, or this panel is a piece of shit?

My fex:

[boot_disp]
advert_disp = 0
auto_hpd = 1
output_type = 4
hdmi_channel = 0
hdmi_mode = 4
cvbs_channel = 1
cvbs_mode = 11
output_full = 1
hdmi_mode_check = 1
screen0_out_color_range = 1

[disp_init]
disp_init_enable = 1
disp_mode = 0
screen0_out_color_range = 1
screen0_output_type = 3
screen0_output_mode = 5
screen1_output_type = 3
screen1_output_mode = 5
fb0_framebuffer_num = 3
fb0_format = 10
fb0_scaler_mode_enable = 1
fb0_width = 1024
fb0_height = 600
fb1_framebuffer_num = 3
fb1_format = 10
fb1_scaler_mode_enable = 1
fb1_width = 1024
fb1_height = 600
hdcp_enable = 0

[hdmi_para]
hdmi_used = 1
hdmi_power = "vcc-hdmi-18"
hdmi_cts_compatibility = 1
hdcp_enable = 0