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Custom modeline calculation -> monitor “artefact”

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1

I am trying to get a custom resolution to run on my 4k, 60Hz TV. I am mostly working on a Thinkpad that only supports 4k@30Hz via Display Port. I would much rather work on a lower resolution with a higher refresh rate, so I set out to generate a custom modeline (1440p @60Hz).
This is necessary since the TVs edid information only forwards 4k and 1080p resolutions.

The first tool I was using is cvt:

> cvt 2560 1440 60
# 2560x1440 59.96 Hz (CVT 3.69M9) hsync: 89.52 kHz; pclk: 312.25 MHz
Modeline "2560x1440_60.00" 312.25 2560 2752 3024 3488 1440 1443 1448 1493 -hsync +vsync

I added the mode to xrandr and started the output to my TV.
The following artefact is appearing now:

The left side of everything on my monitor gets replicated on the right side and overlaps a significant part of the right side of the monitor. This overlap is clearly only happening on the monitor level since I can move my mouse "below" the overlap on the right side.

What I did next was trying to understand this webpage about modeline calculation: Modeline Details.

I used the Modelines in my TVs edid and based on that information recalculated the clocks etc. for my specific resolution and my TV. However, it does not work. I cannot move the overlap an inch to the right or left regardless of the value I change in the given Modeline (except of course by changing the resolution itself). I need to be pointed into the right direction to understand where this artefact is coming from and how to resolve it.

xrandr resolution edid

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edited 2 days ago

Invarianz

asked Apr 13 at 15:20

InvarianzInvarianz

62

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add a comment | 

1

I am trying to get a custom resolution to run on my 4k, 60Hz TV. I am mostly working on a Thinkpad that only supports 4k@30Hz via Display Port. I would much rather work on a lower resolution with a higher refresh rate, so I set out to generate a custom modeline (1440p @60Hz).
This is necessary since the TVs edid information only forwards 4k and 1080p resolutions.

The first tool I was using is cvt:

> cvt 2560 1440 60
# 2560x1440 59.96 Hz (CVT 3.69M9) hsync: 89.52 kHz; pclk: 312.25 MHz
Modeline "2560x1440_60.00" 312.25 2560 2752 3024 3488 1440 1443 1448 1493 -hsync +vsync

I added the mode to xrandr and started the output to my TV.
The following artefact is appearing now:

The left side of everything on my monitor gets replicated on the right side and overlaps a significant part of the right side of the monitor. This overlap is clearly only happening on the monitor level since I can move my mouse "below" the overlap on the right side.

What I did next was trying to understand this webpage about modeline calculation: Modeline Details.

I used the Modelines in my TVs edid and based on that information recalculated the clocks etc. for my specific resolution and my TV. However, it does not work. I cannot move the overlap an inch to the right or left regardless of the value I change in the given Modeline (except of course by changing the resolution itself). I need to be pointed into the right direction to understand where this artefact is coming from and how to resolve it.

xrandr resolution edid

share|improve this question

edited 2 days ago

Invarianz

asked Apr 13 at 15:20

InvarianzInvarianz

62

New contributor

Invarianz is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

add a comment | 

I am trying to get a custom resolution to run on my 4k, 60Hz TV. I am mostly working on a Thinkpad that only supports 4k@30Hz via Display Port. I would much rather work on a lower resolution with a higher refresh rate, so I set out to generate a custom modeline (1440p @60Hz).
This is necessary since the TVs edid information only forwards 4k and 1080p resolutions.

The first tool I was using is cvt:

> cvt 2560 1440 60
# 2560x1440 59.96 Hz (CVT 3.69M9) hsync: 89.52 kHz; pclk: 312.25 MHz
Modeline "2560x1440_60.00" 312.25 2560 2752 3024 3488 1440 1443 1448 1493 -hsync +vsync

I added the mode to xrandr and started the output to my TV.
The following artefact is appearing now:

The left side of everything on my monitor gets replicated on the right side and overlaps a significant part of the right side of the monitor. This overlap is clearly only happening on the monitor level since I can move my mouse "below" the overlap on the right side.

What I did next was trying to understand this webpage about modeline calculation: Modeline Details.

I used the Modelines in my TVs edid and based on that information recalculated the clocks etc. for my specific resolution and my TV. However, it does not work. I cannot move the overlap an inch to the right or left regardless of the value I change in the given Modeline (except of course by changing the resolution itself). I need to be pointed into the right direction to understand where this artefact is coming from and how to resolve it.

xrandr resolution edid

share|improve this question

edited 2 days ago

Invarianz

asked Apr 13 at 15:20

InvarianzInvarianz

62

New contributor

Invarianz is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

> cvt 2560 1440 60
# 2560x1440 59.96 Hz (CVT 3.69M9) hsync: 89.52 kHz; pclk: 312.25 MHz
Modeline "2560x1440_60.00" 312.25 2560 2752 3024 3488 1440 1443 1448 1493 -hsync +vsync

share|improve this question

edited 2 days ago

Invarianz

asked Apr 13 at 15:20

InvarianzInvarianz

62

New contributor

Invarianz is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this question

edited 2 days ago

Invarianz

asked Apr 13 at 15:20

InvarianzInvarianz

62

New contributor

Invarianz is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked Apr 13 at 15:20

InvarianzInvarianz

62

New contributor

Invarianz is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked Apr 13 at 15:20

InvarianzInvarianz

62