Back in the day, grayscale monitors were significantly cheaper.
So I built a circuit with op amps to add the Red, Green, and Blue signals together, into one signal. It worked well. I still have it. I know it works up to 1024x1024x60Hz. I don't know how much higher above that it will work.
I noticed that cash registers only had monochrome displays. And I thought that while color was nice, it wasn't necessary for most tasks. I thought that monochrome would win out because it was significantly cheaper. I was wrong. People want color.
Anyway, build yourself a circuit with high speed op amps to add together the RGB signals into a monochrome signal.
Ken
On Friday, February 20, 2026 at 03:37:47 PM EST, Noth <noth@nineinchnetworks.ch> wrote:
Yes we had someone on IRC a while back (like at least 5 years ago) who
was complaining of this, grayscale doesn't work anymore in xenocara, and
that may be the case in regular Xorg too. I guess we have zero users who
use this mode?
Cheers,
Noth
On 20/02/2026 21:29, dan wrote:
> I also tried both -render gray and mono option of X or lauching startx
> but no luck..
>
> Dan
> bsd.numode.eu
>
>
> Crystal Kolipe <kolipe.c@exoticsilicon.com> wrote:
>
>> On Fri, Feb 20, 2026 at 02:27:45PM -0500, Allan Streib wrote:
>>> I'm interested in enabling a monocrome (greyscale) display mode,
>>> for use at night/in low lighting situations.
>>>
>>> Per some search results, I tried setting saturation with xrandr but
>>> got an error:
>>>
>>> $ xrandr --output DisplayPort-0 --set Saturation 0
>>> X Error of failed request: BadName (named color or font does
>>> not exist) Major opcode of failed request: 140 (RANDR)
>>> Minor opcode of failed request: 11 (RRQueryOutputProperty)
>>> Serial number of failed request: 38
>>> Current serial number in output stream: 38
>>>
>>> Is there a straightforward way to do this globally?
>> Dmesg?
>>
>> Depending on your graphics hardware, you might be able to run X11 in
>> 8-bit static grey, or some other greyscale visual.
>>
was complaining of this, grayscale doesn't work anymore in xenocara, and
that may be the case in regular Xorg too. I guess we have zero users who
use this mode?
Cheers,
Noth
On 20/02/2026 21:29, dan wrote:
> I also tried both -render gray and mono option of X or lauching startx
> but no luck..
>
> Dan
> bsd.numode.eu
>
>
> Crystal Kolipe <kolipe.c@exoticsilicon.com> wrote:
>
>> On Fri, Feb 20, 2026 at 02:27:45PM -0500, Allan Streib wrote:
>>> I'm interested in enabling a monocrome (greyscale) display mode,
>>> for use at night/in low lighting situations.
>>>
>>> Per some search results, I tried setting saturation with xrandr but
>>> got an error:
>>>
>>> $ xrandr --output DisplayPort-0 --set Saturation 0
>>> X Error of failed request: BadName (named color or font does
>>> not exist) Major opcode of failed request: 140 (RANDR)
>>> Minor opcode of failed request: 11 (RRQueryOutputProperty)
>>> Serial number of failed request: 38
>>> Current serial number in output stream: 38
>>>
>>> Is there a straightforward way to do this globally?
>> Dmesg?
>>
>> Depending on your graphics hardware, you might be able to run X11 in
>> 8-bit static grey, or some other greyscale visual.
>>
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