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#1 2018-04-07 09:23:19

v112112112
Member
Registered: 2018-04-07
Posts: 11

4K Screen overscan

My 4k screen is displaying incorrectly, with the image spilling over the edge by a large amount. I have tried editing overscan in config.txt but it does nothing. If i put the resolution at standard HD 1920 by 1080 in the setup it fills correctly but the image is slightly blurry.

By large I mean probably half the screen has been cut off.

I am using raspberry pi 3B. With windows 64 version of nano dlp it displays perfectly.

Also if this is a lost cause would you recommend any other linux / arm board like asus tinker/ orange pi or do you think windows will be just as good?

Last edited by v112112112 (2018-04-07 09:27:55)

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#2 2018-04-07 12:24:15

v112112112
Member
Registered: 2018-04-07
Posts: 11

Re: 4K Screen overscan

I fixed the issue myself  - still curious how the other boards perform though

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#3 2018-06-06 15:46:16

Sint
Member
Registered: 2018-06-06
Posts: 25

Re: 4K Screen overscan

Can you share how you fixed this problem?
Currently I have the same issue. 4K projector, displayed calibration image is to big. It looks zoomed in. It is in focus though.

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#4 2018-07-05 09:44:41

v112112112
Member
Registered: 2018-04-07
Posts: 11

Re: 4K Screen overscan

Hi Sint, Sorry for taking so long to reply.

this solution worked for my 12 inch screen

[root@boombox ~]# cat /boot/config.txt 
# See /boot/overlays/README for all available options

force_turbo=1
gpu_mem=512
dtparam=audio=on

hdmi_group=2
hdmi_mode=87
hdmi_cvt 3840 2160 24
disable_overscan=1
max_framebuffer_width=3840
max_framebuffer_height=2160
hdmi_pixel_freq_limit=400000000
hvs_priority=0x32ff

framebuffer_depth=32
framebuffer_ignore_alpha=1

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#5 2018-07-05 09:45:48

v112112112
Member
Registered: 2018-04-07
Posts: 11

Re: 4K Screen overscan

[root@boombox ~]# cat /boot/config.txt 
# See /boot/overlays/README for all available options

force_turbo=1
gpu_mem=192
dtparam=audio=on

hdmi_group=2
hdmi_mode=87
hdmi_cvt 2160 3840 24
This one for my z5 4k screen (mipi to dsi)

disable_overscan=1
max_framebuffer_width=2160
max_framebuffer_height=3840
hdmi_pixel_freq_limit=400000000
hvs_priority=0x32ff

framebuffer_depth=16
framebuffer_ignore_alpha=1

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#6 2018-07-06 18:20:54

Sint
Member
Registered: 2018-06-06
Posts: 25

Re: 4K Screen overscan

Thank you for your reply. I also got it working on my own. I use 4K projector.

Here is what I use. Maybe people can use what you have or maybe mine works.


disable_overscan=1
framebuffer_width=3840
framebuffer_height=2160
max_framebuffer_width=3840
max_framebuffer_height=2160
#display_rotate=3
hdmi_ignore_edid=0xa5000080
hdmi_pixel_freq_limit=400000000
hdmi_group=2
hdmi_mode=87
hdmi_timings=3840 1 48 32 80 2160 1 3 5 54 0 0 0 24 0 211190000 3
#hdmi_timings=3840 1 48 32 80 2160 1 3 5 54 0 0 0 28 0 248140000 3
#hdmi_timings=3840 1 48 32 80 2160 1 3 5 54 0 0 0 25 0 220430000 3
gpu_mem=256

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#7 2018-10-12 17:27:02

colgeocol
Member
Registered: 2016-09-14
Posts: 23

Re: 4K Screen overscan

@v112112112

Yesterday I entered a 4K calibration question in Help and Support.

Could you read it and let me know if you have the same problems?

If you were able to solve both questions could you respond.

I have a z5 4k screen (mipi to dsi) as well.

My X/Y Resolution is set to 31.732 microns.  Could this be the cause of the problem?

Also, thank you for your config.txt because it suddenly allowed me to use the display.

Have a good day.

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