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MX6Q HDMI failed to support SXGA(1280x1024@60Hz)

Question asked by Robbie Jiang on Dec 7, 2014
Latest reply on Mar 11, 2016 by Gary Bisson



My MX6Q board is basically based on SABRELITE platform.

The HDMI port works well with "1920x1080@60HZ",

with the following kernel cmd line:

setenv hdmiargs  'video=mxcfb0:dev=hdmi,1920x1080@60,if=RGB24,bpp=24'

setenv bootargs_nfs_video 'setenv bootargs ${console} root=/dev/nfs ip=${ipaddr} nfsroot=${nfs_svr}:${nfs_dir},v3,tcp ${hdmiargs}'

setenv bootcmd_video 'run bootargs_nfs_video; tftpboot ${loadaddr} ${kernel}; bootm'


However, if I change the hdmiargs to 1280x1024:

setenv hdmiargs  'video=mxcfb0:dev=hdmi,1280x1024@60,if=RGB24,bpp=24'


nothing is output on the HDMI display with the command "dd if=/dev/urandom of=/dev/fb0".


And according to section "33.4.3 Supported Video Mode" in MX6Q RM,

this sxga mode ( 1280x1024@60Hz) is not included in the supported mode.


Does this mean that the sxga mode can not be supported by the HDMI port?


But in driver/video/mxc_hdmi.c, sxga mode(1280x1024@60Hz)  IS added to the supported video mode list.


Any idea?