I built angstrom-qt5-x11-image of v2.7 for colibri T20
I ran successfully qml example on device.
I have a monitor with resolution 1920x1080
So I added custom mode in xrandr with cvt command
cvt 1920 1080 60
1920x1080 59.96 Hz (CVT 2.07M9) hsync: 67.16 kHz; pclk: 173.00 MHz
Modeline “1920x1080_60.00” 173.00 1920 2048 2248 2576 1080 1083 1088 1120 -hsync +vsync
xrandr --newmode “1920x1080_60.00” 173.00 1920 2048 2248 2576 1080 1083 1088 1120 -hsync +vsync
xrandr --addmode LVDS-1 1920x1080_60.00
xrandr --output LVDS-1 --mode 1920x1080_60.00
Xrandr change the mode but display showing horizontal lines on it.
I am connecting display with vga port with help of DVI to VGA converter
Please guide me.
Please have a look at the following article on our developer website concerning display output, resolution and timing configuration. Please note that NVIDIA’s proprietary X driver does NOT support xrandr newmode/addmode and such. DVI-A aka Parallel RGB resp. VGA would really need to be configured via vidargs U-Boot environment variable while DVI-D aka HDMI uses DDC/EDID.
With HDMI connected It is showing these available modes:
Screen 0: minimum 256 x 128, current 1440 x 576, maximum 2048 x 2048
LVDS-1 connected 640x480+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
640x480 60.99*+
HDMI-1 connected 1440x576+0+0 (normal left inverted right x axis y axis) 983mm x 576mm
1280x720 60.00 + 50.00
1920x1080 60.00 + 50.00
1680x1050 59.88
1600x900 60.00
1280x1024 60.02
1366x768 59.79 59.80
1440x576 50.00*
1024x768 60.00
1440x480 59.94
800x600 60.32 56.25
720x576 50.00
720x480 59.94
640x480 75.00 72.81 66.67 59.94
720x400 70.08
But when I select :
xrandr --output HDMI-1 --mode 1920x1080
tegradc tegradc.1: switching framebuffer to 1920x1080
tegradc tegradc.1: using mode 1920x1080 pclk=148500000 href=1 vref=1
then It is showing blank screen. But If I select 1280x720 resolution then it shows Qt SmartHome Application. How Can I use 1920 x 1080 resolution?
I guess you might have to adjust your Qt application accordingly (e.g. in QML).
but that is not related to Qt application… It is showing nothing … not even X cursor
Does colibri board support higher resolution like 1920x1080…?
Have you ever tried with our regular LXDE demo image? There it actually works just fine for me.
Works fine for me:
root@colibri-t20:~# xrandr
Screen 0: minimum 256 x 128, current 640 x 480, maximum 2048 x 2048
LVDS-1 connected 640x480+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
640x480 60.99*+
HDMI-1 connected 640x480+0+0 (normal left inverted right x axis y axis) 878mm x 485mm
2048x1080 59.99
1920x1080 50.00
1680x1050 59.88
1280x1024 75.02 60.02
1440x900 74.98 59.90
1280x960 60.00
1280x720 60.00 60.00 50.00
1024x768 75.03 60.00
800x600 75.00 60.32
720x576 50.00
720x480 59.94
640x480 75.00 72.81 66.67 59.94*
720x400 70.08
root@colibri-t20:~# xrandr --output HDMI-1 --mode 2048x1080
[ 51.498472] tegradc tegradc.1: switching framebuffer to 2048x1080
[ 51.498532] tegradc tegradc.1: using mode 2048x1080 pclk=147188000 href=1 vref=1
What exact hardware and software versions of things are you talking about? What strange HDMI screen with a native resolution of 1440 by 576 are you trying to use?
Please make sure to first try our regular latest BSP 2.7b4 with a somewhat sane (e.g. HD or full HD) HDMI screen. Then you may try your strange screen. And last but not least you may try your custom image. Ok?
Actually We are using 37" inch LCD i.e why resolution is strange. This type of LCD you can see in metro rail for route indication.
These are results I tested so far:
- Normal HD display with HDMI interface
1920x1080 - working
- 37" display with dell laptop using ubuntu
1920x1080 - working
- 37" display with colibri T20
1280x720 - working
1920x1080 - not working
what other log files you need to investigate where is problem?
Can you provide dump of EDID for that screen?
dump of EDID with xrandr --verboselink text
Looks like your screen has a rather broken EDID:
=> no serial number
=> unusual aspect ratio of 1.72
=> wants preferred timing mode
=> claims to support standard display mode with X resolution of 1920, X:Y pixel ratio 16:9 and vertical frequency 60 but does not actually display anything!
=> claims to only provide one single native DTD but that is not 1920x1080!
=> provides four DTDs two of which 1280x720p but no 1920x1080p one!
Another interesting log file may be /var/log/Xorg.0.log as it shows what the proprietary NVIDIA X driver does with that broken EDID.
A regular dmesg output may also be helpful.
