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kernel 3.14.28, double lvds issue

Question asked by Angelo Dureghello on Jul 7, 2015
Latest reply on Aug 17, 2015 by Angelo Dureghello

Dear all,

 

i am using double LVDS in a similar sabre-auto board. Upgrading from 3.10.17 to 3.14.28, double (using separate fb's) LVDS (one fb for each LVDS) seems corrupted.

 

In particular

1) seems kernel bootargs as

 

setenv bootargs 'console=ttymxc3,115200 rootwait root=/dev/sda2 \
video=mxcfb0:dev=ldb,1024x768,if=RGB666,bpp=16 \
video=mxcfb1:off video=mxcfb2:dev=ldb,1280x800,if=RGB666,bpp=16'

 

are not taking effect.

 

 

2) Even if i used different IPU for each LVDS channel, LVDS1 at Kernel init phase, seems to impact previously inited LVDS0 destroying the image content, and adding flickering.

 

There are no errors in dmesg, /sys/class/graphic/fb modes seems correct.

 

[user@localhost ~]$ cat /sys/class/graphics/fb0/mode

U:1024x768p-65

 

[user@localhost ~]$ cat /sys/class/graphics/fb2/mode

U:1280x800p-52

 

Is there any known issue with ldb and kernel 3.14 ?

 

Thanks,

Best regards

angelo

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