Hdmi 1280 x 800 display


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Hi,

 

There is a lot of cheap 10.1 inches lcd on market, often have a resolution of 1280 x 800.
I connected this lcd with h3disp using  the mode of 1280 x 720 (720i).
Everything works, but aspect ratio is wrong.  (800->720)
Is there a fast and simply possibility to set 1280x800 resolution in  Armbian?
 
 
 

 

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Armbian is a community driven open source project. Do you like to contribute your code?

Nope. Calculation, kernel patching, recompilation, testing, recompilation, testing, ...

https://forum.armbian.com/index.php/topic/2991-opi-pc-2e-h3disp-1680x1050-dvi-display-issues/

 

Hi,
I'm leaving for a few days , so given parameters it might be someone needed.
For these parameters, display works with 1280x800 , but I do not know if these values are optimum values.
I'll do some more tests after returning, but but for now it works correctly   :)
 
{HDMI1280x800_60, 0,83460000, 0, 1280, 800, 1680, 200, 64, 136, 828, 24, 1, 3, 1, 1, 0, 0, 0}
{{Video ID  ,4 , 0, 96, 5, 3, 3,  1,   1, 0,  0,  0, 144, 64, 136, 32, 28, 1,  1 }}
 PLL_VIDEO 334
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Nope. Calculation, kernel patching, recompilation, testing, recompilation, testing, ...

https://forum.armbian.com/index.php/topic/2991-opi-pc-2e-h3disp-1680x1050-dvi-display-issues/

 

I tested already 1280x800 resolution and works properly with my previous calculations.
 
{HDMI1280x800_60, 0,83460000, 0, 1280, 800, 1680, 200, 64, 136, 828, 24, 1, 3, 1, 1, 0, 0, 0},
{{Video ID  , 4 , 0,    96,  5,   3,  3,  1,   1,  0,  0,  0, 144,  64, 136, 32, 28, 1,  1 }}, 
PLL_VIDEO 334
In addition, I did the calculation in a different location and width of sync pulses (another school :) ) - it also works properly.
 
{HDMI1280x800_60, 0,83910000, 0, 1280, 800, 1656, 32, 32, 312, 841, 17, 16, 8, 1, 1, 0, 0, 0},
{{Video ID  ,  4 ,   0,  96,     5,   8,     3,  1,   16,  0, 1,   0,  120,    64,    56, 32,  41,  1,  1 }}, 
PLL_VIDEO 336
Personally, I am use this second setting.
 
Can you add it to Armbian? :)
 
post-1292-0-85775400-1484050106_thumb.jpg
post-1292-0-09882500-1484050108_thumb.jpg
post-1292-0-66267200-1484050108_thumb.jpg
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As I promised, I published helper tool. Please check this comment: https://github.com/igorpecovnik/lib/issues/594#issuecomment-272992961

Good afternoon. I also have to connect the monitor 1280x800. But I did not understand how to do it - you can write detailed instructions?

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Hello,

finally I understood what do I have to do. I have checked timings with .bin via fex. Then I recompiled kernel and installed to SD card. But I have problem: when I check via fex I get resolution 1280x720 instead of monitor's 1280x800. I have compiled with 720p, but the picture isn't sharp, but when I change 720 with 800 I don't get picture. Please help. 

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Hi tomter

does your timing correspond to this?

http://tinyvga.com/vga-timing/1280x800@60Hz

you have to check the lines in the kernel, and in h3disp (which sets fex) you will setup the pll_video.

it works for me if the value of the pll_video / divisor from kernel = pixel frequency. I had a problem with

wrong value in h3disp.

see also my question at: https://forum.armbian.com/index.php?/topic/4094-vesa-1280x1024-with-h3disp/

 

Disclaimer: I do not know what I am doing but I hope this helps,

 

gnasch

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On 1/10/2017 at 2:21 PM, mariuszb said:

 

I tested already 1280x800 resolution and works properly with my previous calculations.

{HDMI1280x800_60, 0,83910000, 0, 1280, 800, 1656, 32, 32, 312, 841, 17, 16, 8, 1, 1, 0, 0, 0},
{{Video ID  ,  4 ,   0,  96,     5,   8,     3,  1,   16,  0, 1,   0,  120,    64,    56, 32,  41,  1,  1 }}, 
PLL_VIDEO 336

 

I would like to confirm that the above video settings work for me too on a samsung laptop pannel 1280x800 using a tsum v29 universal lcd controller, BUT i had to set PLL_VIDEO=330 to get correct colors. Using 336 or from 332 to 338 results in blurry mostly green screen. PLL 330 nad 331 worked for me so i havent tested anything else.

 

P.S. :

I tested first option and it works too whithout changing pll using the stated 334.

I made a patch for those that want to try it but dont know how and where to add the modlines. To activate resolution change screen0_output_mode = 38 screen1_output_mode = 38 and pll_video = 334 in script.bin

Or add :

                38|1280x800) # res
                        HDMIMode=38
                        pll_video=334
                        ;;

in /usr/bin/h3disp and use h3disp to set changes.

 

If you want to risc it and trust me you can try my precompiled packages for OrangePi_PC.

https://drive.google.com/drive/folders/0B40z5IEobXstb0g0am9NMHkwWTQ?usp=sharing

 

z-0004-add_1280x800.patch

 

And a big THANK YOU to mariuszb for finding the correct values for this resolution.

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Hello, I also have the 1280x800 monitor. The patch z-004-add-addonal-2048x1536.txt didn't work for me. The monitor works well with Armbian based on mainline kernel, but I need to continue with 3.4.113 kernel. I was unable to download the u-boot-h3-video-helper.bin file - the site can't be reached. Where can I find the file? Thanks,

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Hello, I've just tried to apply the z-0004-add_1280x800.patch file from the above link and was able to see in the new compilation

 

[warn] z-0004-add_1280x800.patch [failed]

 

I've compared the files in an older compilation and indeed, the patch was not fully applied. What is a good way to solve this problem (I assume that editing the source files is not a good way). Thanks,

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1 hour ago, perfstr said:

I assume that editing the source files is not a good way


If the patch doesn't apply you need to add those values manually. Pay attention that you don't add things that are already in the sources. CREATE_PATCHES="yes" is a build parameter that you need. Next is precies copy from z-0004-add_1280x800.patch/paste operation and when you have a patch that works, send it upstream: https://www.armbian.com/get-involved

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The bad background color is the pll value but not only that (for me atleast). There is some other problem because i use pll 334 and the picture is perfect but often if i turn off the display and turn it on again it gets this color problem as if the pll is wrong. This happens when i boot the board also. its like 50/50 chance to get this problem and cycling the display on and off fixes it for me but is really annoying. Since i use a laptop panel and a universal controller board i think it may be the lcd controller but it does not happen on other resolutions. Anyway since i got another display i haven't looked into this any further.

 

Hope its only pll value for you.

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Hello, the patch I've published earlier, worked for me fine until the last OS version update (apt-get upgrade). After the update I get black screen. I have a development environment with Full HD display. The display is able to adapt to 120x800 resolution.  If I switch display mode to Full HD using h3disp, the system works fine. The h3disp still shows 1280x800 resolution in the list, but switching to that mode causes again black screen. I understand that some updated module doesn't support this resolution. How can I fix the problem without rebuilding all the system again?

 

Thanks in advance.

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