What had been working reliably after new cables attached, suddenly
dropped its right-hand screen.
But when I boot on a Mint live flash-drive, both screens come up.
So far I cannot seem to get it going again.
The Display driver only sees one screen.
I have an AMD graphics card. No Nvidia.
:( Alan
What had been working reliably after new cables attached, suddenly
dropped its right-hand screen.
But when I boot on a Mint live flash-drive, both screens come up.
So far I cannot seem to get it going again.
The Display driver only sees one screen.
I have an AMD graphics card. No Nvidia.
:( Alan
On 5/16/26 12:02 PM, pinnerite wrote:
What had been working reliably after new cables attached, suddenly
dropped its right-hand screen.
But when I boot on a Mint live flash-drive, both screens come up.
So far I cannot seem to get it going again.
The Display driver only sees one screen.
I have an AMD graphics card. No Nvidia.
:( Alan
What does the display menu tells you?
On Sat, 5/16/2026 6:02 AM, pinnerite wrote:
What had been working reliably after new cables attached, suddenly
dropped its right-hand screen.
But when I boot on a Mint live flash-drive, both screens come up.
So far I cannot seem to get it going again.
The Display driver only sees one screen.
I have an AMD graphics card. No Nvidia.
:( Alan
This command is a complement to what you see in the display panel.
xrandr -q
bullwinkle@PROGRESS:~$ xrandr -q
Screen 0: minimum 8 x 8, current 1280 x 1024, maximum 32767 x 32767
DVI-D-0 disconnected (normal left inverted right x axis y axis)
DP-0 disconnected (normal left inverted right x axis y axis)
DP-1 disconnected (normal left inverted right x axis y axis)
HDMI-0 connected primary 1280x1024+0+0 (normal left inverted right x axis y axis) 338mm x 270mm
1280x1024 60.02*+ 75.02
1280x720 60.00 59.94
1152x864 75.00
1024x768 75.03 70.07 60.00
800x600 75.00 72.19 60.32 56.25
640x480 75.00 72.81 59.94
DP-2 disconnected (normal left inverted right x axis y axis)
DP-3 disconnected (normal left inverted right x axis y axis)
DP-4 disconnected (normal left inverted right x axis y axis)
DP-5 disconnected (normal left inverted right x axis y axis)
(Card has HDMI, DP,DP,DP, DVI-D. HDMI to VGA adapter driving one 1280x1024 VGA LCD monitor. )
There are also some EDID commands ("readedid"), for dumping the EDID over the interface
on each display cable. HDMI/DP/VGA/DVI have EDID, signals with names like SDA,SCK.
The video card send SDA,SCK and the monitor reads back its EEPROM of stuff. Some poorly prepared monitors did not have a write-protect on
their EDID EEPROM and could be (accidentally) modified. With
various humorous results.
It is the reading of the EDID on my 20 year old LCD monitor, that
results in the six lines of resolution choices. XRandr then, also
has to read the EDID to get that info.
If you are using a KVM, that is another source of surprises
when it comes to monitor detection.
Paul
On Sat, 16 May 2026 12:07:36 +0200
Edmund <nomail@hotmail.com> wrote:
On 5/16/26 12:02 PM, pinnerite wrote:
What had been working reliably after new cables attached, suddenly dropped its right-hand screen.
But when I boot on a Mint live flash-drive, both screens come up.
So far I cannot seem to get it going again.
The Display driver only sees one screen.
I have an AMD graphics card. No Nvidia.
:( Alan
What does the display menu tells you?
Absolutely nothing helpful.
On Sat, 16 May 2026 15:48:56 +0100
pinnerite <pinnerite@gmail.com> wrote:
On Sat, 16 May 2026 12:07:36 +0200However, ChatGPT, ulike Google's AI hit the spot:
Edmund <nomail@hotmail.com> wrote:
On 5/16/26 12:02 PM, pinnerite wrote:Absolutely nothing helpful.
What does the display menu tells you?
What had been working reliably after new cables attached, suddenly
dropped its right-hand screen.
But when I boot on a Mint live flash-drive, both screens come up.
So far I cannot seem to get it going again.
The Display driver only sees one screen.
I have an AMD graphics card. No Nvidia.
:( Alan
sudo apt update
sudo apt install --reinstall \
linux-image-6.8.0-84-generic \
linux-modules-6.8.0-84-generic \
linux-modules-extra-6.8.0-84-generic
sudo update-initramfs -u
reboot
And I had two screens, except the desktop icons and panel were now on
the left-hand screen but I can live with that.
Alan
On Sat, 5/16/2026 12:02 PM, pinnerite wrote:
On Sat, 16 May 2026 15:48:56 +0100
pinnerite <pinnerite@gmail.com> wrote:
On Sat, 16 May 2026 12:07:36 +0200However, ChatGPT, ulike Google's AI hit the spot:
Edmund <nomail@hotmail.com> wrote:
On 5/16/26 12:02 PM, pinnerite wrote:Absolutely nothing helpful.
What does the display menu tells you?
What had been working reliably after new cables attached, suddenly
dropped its right-hand screen.
But when I boot on a Mint live flash-drive, both screens come up.
So far I cannot seem to get it going again.
The Display driver only sees one screen.
I have an AMD graphics card. No Nvidia.
:( Alan
sudo apt update
sudo apt install --reinstall \
linux-image-6.8.0-84-generic \
linux-modules-6.8.0-84-generic \
linux-modules-extra-6.8.0-84-generic
sudo update-initramfs -u
reboot
And I had two screens, except the desktop icons and panel were now on
the left-hand screen but I can live with that.
Alan
So it is indicating you should reinstall your kernel (in so many words) ?
There must have been some comment text, indicating why
it thought that was necessary. Video card driver via DKMS ?
Does that mean something happened the last time you build
some driver or something ? The TV tuner probably isn't
on your Daily Driver, but maybe it is.
*******
Doing a Google search, the results are filled with forums cases
where a monitor goes missing.
In this example of a response to the problem, they blame both
a kernel versus driver version mismatch, but I found one thread
where someone "tried every kernel version under the sun" and it
didn't help. This article also mention reinstalling Xorg. It would
be unusual today, for /etc/X11 to have an xorg.conf, as the "automation"
is supposed to generate the xorg.conf on the fly. I used to generate
custom xorg.conf, but it was because of the crappy virtual machine environment which had no end of problems with video (wrong res, small res).
https://www.2bytes.org/poleznyashki-i-zametki-it/linux/how-to-revive-your-second-monitor-in-manjaro-when-the-system-doesnt-detect-it/
We're still not getting an explanation of what the root cause is,
whether AMD and NVidia know about this, are causing this, or
it's an XWayland problem, or whatever. Without root cause we
are swatting at flies with an inadequate fly swatter.
Paul
On Sat, 16 May 2026 12:36:56 -0400
Paul <nospam@needed.invalid> wrote:
On Sat, 5/16/2026 12:02 PM, pinnerite wrote:
On Sat, 16 May 2026 15:48:56 +0100
pinnerite <pinnerite@gmail.com> wrote:
On Sat, 16 May 2026 12:07:36 +0200However, ChatGPT, ulike Google's AI hit the spot:
Edmund <nomail@hotmail.com> wrote:
On 5/16/26 12:02 PM, pinnerite wrote:Absolutely nothing helpful.
What does the display menu tells you?
What had been working reliably after new cables attached, suddenly >>>> dropped its right-hand screen.
But when I boot on a Mint live flash-drive, both screens come up.
So far I cannot seem to get it going again.
The Display driver only sees one screen.
I have an AMD graphics card. No Nvidia.
:( Alan
sudo apt update
sudo apt install --reinstall \
linux-image-6.8.0-84-generic \
linux-modules-6.8.0-84-generic \
linux-modules-extra-6.8.0-84-generic
sudo update-initramfs -u
reboot
And I had two screens, except the desktop icons and panel were now on
the left-hand screen but I can live with that.
Alan
So it is indicating you should reinstall your kernel (in so many words) ?
There must have been some comment text, indicating why
it thought that was necessary. Video card driver via DKMS ?
Does that mean something happened the last time you build
some driver or something ? The TV tuner probably isn't
on your Daily Driver, but maybe it is.
*******
Doing a Google search, the results are filled with forums cases
where a monitor goes missing.
In this example of a response to the problem, they blame both
a kernel versus driver version mismatch, but I found one thread
where someone "tried every kernel version under the sun" and it
didn't help. This article also mention reinstalling Xorg. It would
be unusual today, for /etc/X11 to have an xorg.conf, as the "automation"
is supposed to generate the xorg.conf on the fly. I used to generate
custom xorg.conf, but it was because of the crappy virtual machine environment which had no end of problems with video (wrong res, small res).
https://www.2bytes.org/poleznyashki-i-zametki-it/linux/how-to-revive-your-second-monitor-in-manjaro-when-the-system-doesnt-detect-it/
We're still not getting an explanation of what the root cause is,
whether AMD and NVidia know about this, are causing this, or
it's an XWayland problem, or whatever. Without root cause we
are swatting at flies with an inadequate fly swatter.
Paul
What is weird about this is that it had been working for some time
using the amd gpu driver. Why it lost the plot is an unknown.
Alan
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