Unable to change display resolution

I suceeded in changing the screen resolution (first disabling graphicsx second disabling display0, then changing resolution and enabling displayx and graphicsx). But i still have a black screen !

I don't remember where but i read something about impossibility to use hdmi output throught a DVI screen, is that true ?

Bat

if DVI interface is connected to on-chip HDMI, it is very possible that the DVI monitor can not detect signal from on-chip HDMI. We are aware this problem and actively working on this issue.

Do you monitor has HDMI interface? Could you try that?

Regards,

yihe

Thank you Yihe for your reply,

What do you mean by "the DVI monitor can not detect signal from on-chip HDMI" ? should i understand that there is no way to use the HDMI output from board with a HDMI/DVI wire ?

Because i tried using graphics0 as output from HDMI to DVO2, and then, while changing timings, i have a warning message from my LCD screen, which said : bad value.

So now i am sure that LCD screen detects signals from DVI, as a results 3 differents states: black screen, warning message and no signals message (when HDMI/DVI wire is unplugged).

What should i do to have my LCD screen working with the EVM ?

Bat

Bat,

connecting DVI monitor to on-chip HDMi may not work now.

Could you provide the warning message?  There are three graphics pipeline in the silicon, by default, graphics1 is connected to DVO2 port. so you can open /dev/fb1 to output to dvo2 port

Check the VPSS Video User Guide to get instructions about changing the resolution.

Regards,

yihe 

Yihe,

I don't have anymore problem to change resolution as long as i worked on HDMI.

In VPSS user Guide, it is written: "Tied VENC function does not work." - I confirmed tied function never worked, in my case.

You said to me that : "connecting DVI monitor to on-chip HDMI may not work now." - I confirmed, in my case, DVI monitor don't work with on-chip HDMI.

So... what can i do, are my DVI screens useless ? if a bought an hdmi adaptator to DVI will the problem be solved ?

Correct me, but i think by default graphics1 is connected to hdcomp. I will try using fb1, but if fb0 is not working there is no way fb1 could work !

Do you know if next PSP version will correct tied venc function and dvi output ? when will the new PSP version be available ?

Thanks,

Bat

Bat,

Tied Venc support has been added since PSP 04.00.01.13 release.

In the next PSP release(04.00.02.14), DVI monitor is supported, which is around end of Dec or early jan.

Yes, for DM816X, fb1 is default to HDCOMP. but you can easily redirct to DVO2 by the below command;

echo 1:dvo2 > /sys/devices/platform/vpss/graphics1/nodes.

you may need configure var.xres/yres/vxres/vyres properly to match the resolution of DVO2 since fbdev can not auto detect the resoltion changes now.

Regards,

yihe

I just download the PSP 04.00.01.13 but i have some problems (see).

I will be back when corrected.

Thanks,

Bat

EDIT: link corrected

Bat,

What's your problem?

I  can not see it from the link.

Regards

yihe

Yihe,

Thank you again...

I corrected the broken link about error in compilation of PSP 04.00.01.13.

Bat