Re: Unrecognized Monitor

Victor,

I made some notes on a similar issue some time ago when I had an issue with
a monitor that would come up correctly as 1280x1024 if I used a DVI cable,
but would come up with 1024x768 if I used a VGA cable. Here's what I have
-- this was for Dedora a few releases ago:

------------------------------------------------
On SouthPole, if the screen resolution doesn't come up as 1280x1024, then
as root: use xrandr to get the display name:

# xrandr
Screen 0: minimum 320 x 200, current 1024 x 768, maximum 2048 x 2048
VGA1 connected 1024x768+0+0 (normal left inverted right x axis y axis) 0mm
x 0mm
   1024x768       60.0
   800x600        60.3     56.2
   640x480        59.9

use cvt to get new mode settings:

# cvt 1280 1024
# 1280x1024 59.89 Hz (CVT 1.31M4) hsync: 63.67 kHz; pclk: 109.00 MHz
Modeline "1280x1024_60.00" 109.00 1280 1368 1496 1712 1024 1027 1034
1063 -hsync +vsync

Then enter the following both interactively (to test it) and add it to
/etc/gdm/Init/Default for reboots.

xrandr --newmode "1280x1024_60.00" 109.00 1280 1368 1496 1712 1024 1027
1034 1063 -hsync +vsync xrandr --addmode VGA1 1280x1024_60.00
xrandr --output VGA1 --mode 1280x1024_60.00

These get added right after the PATH and OLD_IFS lines in the Default file.

-----------------------------------------------------

I found with a later version of Fedora that the file to which to add this
is no longer at that location, but I don't know what the correct one is,
since I no longer have the issue.

More recently I am also using a TV as a monitor -- I had to jump through
some hoops to disable overscanning on the HDMI port used by my computer.
Oversanning apparently improves a broadcast picture, but for a computer you
lose the edges of the display if it's enabled.

I hope this helps you out.

Richard Wilson

On Wed, Feb 28, 2018 at 11:08 PM, Victor Odhner <vodhner@cox.net> wrote:

> I'm trying to bring an unknown monitor up to full resolution.
> It's a Visio E241-A1 (TV set), claiming 1920x1080.
> I’m running Linux Mint 18.3 Sylvia, with Mate.
> The computer (a new desktop) also drives an HDMI cable to a projector, but
> that’s turned off right now.
>
> I used --newmode with xrandr and it seemed to accept that,
> but then the --addmode said it didn’t know the new mode:
>

>     xrandr: cannot find mode 1920x1080_60.00

>
> Details below.
> *So, is there a way to make this work?*
>
> *The Details:*
>
> xrandr: cannot find mode 1920x1080_60.00
>
> Here's the advice I've been working for:
>
> https://unix.stackexchange.com/questions/227876/how-to-
> set-custom-resolution-using-xrandr-when-the-resolution-is-not-available-i
>
> Original source: https://gist.github.com/debloper/2793261
>

> vodhner@MusicTeam ~ $ xrandr -q
> Screen 0: minimum 8 x 8, current 1024 x 768, maximum 32767 x 32767
> DP1 connected 1024x768+0+0 (normal left inverted right x axis y axis) 0mm
> x 0mm
>    1024x768      60.00*
>    800x600       60.32    56.25
>    848x480       60.00
>    640x480       59.94
> HDMI1 disconnected (normal left inverted right x axis y axis)
> HDMI2 disconnected (normal left inverted right x axis y axis)
> HDMI3 disconnected (normal left inverted right x axis y axis)
> VIRTUAL1 disconnected (normal left inverted right x axis y axis

>
> vodhner@MusicTeam ~ $ gtf 1020 1080 60
>
> # 1024x1080 @ 60.00 Hz (GTF) hsync: 67.08 kHz; pclk: 92.30 MHz
> Modeline "1024x1080_60.00" 92.30 1024 1088 1200 1376 1080 1081 1084
> 1118 -HSync +Vsync
>
> vodhner@MusicTeam ~ $ xrandr --newmode "1024x1080_60.00" 92.30 1024
> 1088 1200 1376 1080 1081 1084 1118 -HSync +Vsync
>
> vodhner@MusicTeam ~ $ xrandr --addmode DP1 "1920x1080_60.00"
> xrandr: cannot find mode "1920x1080_60.00"
>
> vodhner@MusicTeam ~ $ xrandr --output DP1 --mode "1920x1080_60.00"
> xrandr: cannot find mode 1920x1080_60.00
> vodhner@MusicTeam ~ $
>
> Thanks,
>
> Victor
> ___________
>
>
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