Screen Resolution


5 posts
by spamurai » Thu Jun 28, 2012 9:51 pm
Hi,

I'm having trouble with my screen resolution.
I've been through loads and loads of threads but still can not find a solution.

As i'm a beginner, maybe i'm doing something stupid, i don't know.

My Tv is 1920x1080i.

I've fixed the overscan so it fits my screen properly. I did that in the "sudo nano /boot/config.txt".
However, my txt is a tiny bit too small and slightly blurry, i'm assuming its the resolution.

Looking on the RPi Config file page, i can not see a group/mode that is suitable for my screen resolution.
I've tried a few that i thought were logical choices, but still looks the same :(
(I've even had to put the SD card in my mac to remove a certain mode as after the reboot it wouldn't even boot up again. I guessing it didn't like the hdmi mode :lol: )

Anyone else had this problem or know how to fix it?
I can't really do anything as it is because after 30mins of using it the text gives me a headache :roll:

Thanks
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by dom » Thu Jun 28, 2012 10:33 pm
/opt/vc/bin/tvservice -m CEA
/opt/vc/bin/tvservice -m DMT
Will list the supported resolutions.

720p60 is pretty widely supported, so would be a good choice.

hdmi_group=1
hdmi_mode=4

(from http://elinux.org/RPi_config.txt)
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by spamurai » Thu Jun 28, 2012 10:43 pm
dom wrote:/opt/vc/bin/tvservice -m CEA
/opt/vc/bin/tvservice -m DMT
Will list the supported resolutions.

720p60 is pretty widely supported, so would be a good choice.

hdmi_group=1
hdmi_mode=4

(from http://elinux.org/RPi_config.txt)


Yeh i've been trying many different ones from both CEA and DMT.
Do you know what the difference is between the two?

group 1 mode 4 is not supported.

I'm assuming i should stick to 60Hz if thats what the TV's default is?

The only ones my TV support @ 60Hz are:

1) Group 1 Mode 5 (1920x1080) interlaced
2) Group 1 Mode 16 (1920x1080) progressive
3) Group 2 Mode 16 (1024x768) progressive

And whats the difference between interlaced and progressive?

1) and 2) are too small and 3) is too big :cry:
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by dom » Thu Jun 28, 2012 11:07 pm
Progressive is better than interlaced (interlaced alternates displaying odd and even lines each frame, and tends to be more flickery).

Use 1080 progressive and add:
framebuffer_width=1280
framebuffer_height=720
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by spamurai » Thu Jun 28, 2012 11:36 pm
dom wrote:Progressive is better than interlaced (interlaced alternates displaying odd and even lines each frame, and tends to be more flickery).

Use 1080 progressive and add:
framebuffer_width=1280
framebuffer_height=720


Awesome, thats handy to know. Thanks.

I used overscan_left=-20 etc. Is that the same as frame buffer?
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