Can't set to 1366x768 resolution in UDOObuntu 1.0

Using UDOO Quad on latest UDOObuntu release 1.0, hooked up to an HP w1858 monitor that supports up to 1366x768 resolution via HDMI to DVI cable. the only resolution the monitor settings will let me set is 1280x1024.

I have tried:

Code:

cvt 1366 768 60

which outputs:

Code:

# 1368x768 59.88 Hz (CVT) hsync: 47.79 kHz; pclk: 85.25 MHz
Modeline "1368x768_60.00"   85.25  1368 1440 1576 1784  768 771 781 798 -hsync +vsync

Then I enter:

Code:

sudo xrandr --newmode "1366x768_60.00"  85.25  1368 1440 1576 1784  768 771 781 798 -hsync +vsync

and I get:

Code:

xrandr: Failed to get size of gamma for output default
X Error of failed request:  BadName (named color or font does not exist)
  Major opcode of failed request:  150 (RANDR)
  Minor opcode of failed request:  16 (RRCreateMode)
  Serial number of failed request:  19
  Current serial number in output stream:  19

Then:

Code:

xrandr --addmode default 1360x768_60

which gives:

Code:

xrandr: Failed to get size of gamma for output default

and finally i type:

Code:

xrandr --output default --mode 1366x768_60

and I get:

Code:

xrandr: cannot find mode 1366x768_60

After all of this, i can see 1366x768 in the monitor settings options, but selecting and applying just crashes the settings screen without error, and it stays on 1280x1024

 

Hi SoundChaos,

You should try to set the correct resolution in the U-Boot video environment variable. Follow the guide to connect the board via serial:
http://www.udoo.org/ProjectsAndTutorials/connecting-via-serial-cable/?portfolioID=1394

and set the video resolution using the "setenv" command
e.g.

Code:

setenv video mxcfb0:dev=hdmi,1368x768M@60,bpp=32

Let us know if this work

 

In U-Boot via serial connection I just tried:

Code:

setenv video mxcfb0:dev=hdmi,1366x768M@60,bpp=32
saveenv

But now, after the UDOO splash/info screen, it goes to a black screen, and it still wont come back after:

Code:

setenv video mxcfb0:dev=hdmi,1280x1024M@60,bpp=32

EDIT: I got it working, browsed the HDMI issues forum and used this code in this order:

Code:

setenv bootargs console=ttymxc1,115200 root=/dev/mmcblk0p1 rootwait rw fbmem=24M video=mxcfb0:dev=hdmi,1366x768@60,bpp=32

setenv mmcargs setenv bootargs console=ttymxc1,115200 root=/dev/mmcblk0p1 rootwait rw fbmem=24M video=mxcfb0:dev=hdmi,1366x768@60,bpp=32

setenv videomode video=mxcfb0:dev=hdmi,1366x768@60,bpp=32

saveenv

boot

Thanks so much for the help and pointing me to the U-Boot / setenv!