Unrecognized Monitor

[Michael Butash]

It looks like the monitor simply isn't responding with the right
resolutions, like it doesn't actually do 1080p, or it would report it in
the xrandr -q.  I've run into this with old tv's and such that were
finicky, like crappy off-brand chinese tv's (ahem), and simply found
fighting them wasn't worth it to make work when usually a customer or
friends house to show something off.

If it doesn't report 1080p, it usually won't do 1080p.  Check your cable
too, I've just dealt with issues like this under windoze connected to our
noc displays.  Those were 75ft hdmi, but they wouldn't report right
resolutions until we replaced with higher-quality, shorter cables.  Yours
might just be toast.

You can get things like edid ghosters to override those sorts of things,
but it's usually dealing with some exotic hardware you're doing it.
Otherwise throw away the cable/tv, or put it in the kids room somewhere,
and get hardware that works right.

-mb

On Wed, Feb 28, 2018 at 11:08 PM, Victor Odhner <vodhner at 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 at 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 at 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 at MusicTeam ~ $ xrandr --newmode "1024x1080_60.00"  92.30  1024
> 1088 1200 1376  1080 1081 1084 1118  -HSync +Vsync
>
> vodhner at MusicTeam ~ $ xrandr --addmode DP1 "1920x1080_60.00"
> xrandr: cannot find mode "1920x1080_60.00"
>
> vodhner at MusicTeam ~ $ xrandr --output DP1 --mode "1920x1080_60.00"
> xrandr: cannot find mode 1920x1080_60.00
> vodhner at MusicTeam ~ $
>
> Thanks,
>
> Victor
> ___________
>
>
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