Does this ring any bells with anyone? Is there anything else I should
have tried?
On 13/08/2022 18:49, Daniel James wrote:
Does this ring any bells with anyone? Is there anything else I should
have tried?
My memory of when multiple monitor support came out, was that the motherboard/display adapter manual would list supported configurations.
A VGA only monitor sounds very old, does it support HDMI too?
In article <td948m$2tqr0$1@dont-email.me>, Pancho wrote:
My memory of when multiple monitor support came out, was that the motherboard/display adapter manual would list supported configurations.
The PC was bought refurbished ... the manuals I've found online aren't
that specific about combinations of displays, but does say that two
monitors are supported.
A VGA only monitor sounds very old, does it support HDMI too?
It's not that the monitors require VGA (they have VGA, DVI-D, HDMI, and
DP) but that the PC has one VGA and one DP port, so to use two monitors
one of them would have to be VGA.
As the PC is a "Tiny" model there's no room for any expansion card.
Lenovo did sell these with an additional HDMI port (there's a blanking
plate on the back of the case where this would go) but I don't know
whether it was ever sold as an upgrade - I certainly haven't been able to find one.
If I can't get VGA+DP to work the only option left would seem to be a USB display adaptor (or a new PC) but we'd rather not spend the money!
My question, really, was: The H81 chipset appears to support two
displays, so is the fact that it's not working here
a) A Lenovo hardware design limitation
b) A Lenovo firmware limitation
c) A Windows10/driver limitation
I don't think it's a hardware limitation, as I've seen discussion online about getting a *third* display working (you can't, but two apparently
worked for them, under Windows 7)
As I said, I've already updated the BIOS to the latest (from 4th Jan this year) ... so I don't think it's a firmware limitation.
I don't know much about Windows 10, though. I'm more of a Linux guy these days. We appear to have the latest drivers (according to Device Manager)
but is there anything else I need to get dual-monitor support?
Thanks for your help.
My memory of when multiple monitor support came out, was that the motherboard/display adapter manual would list supported configurations.
A VGA only monitor sounds very old, does it support HDMI too?
I don't know much about Windows 10, though. I'm more of a Linux guy these days. We appear to have the latest drivers (according to Device Manager)
but is there anything else I need to get dual-monitor support?
It's not that the monitors require VGA (they have VGA, DVI-D, HDMI, and
DP) but that the PC has one VGA and one DP port, so to use two monitors
one of them would have to be VGA.
On 13/08/2022 22:15, Pancho wrote:
On 13/08/2022 18:49, Daniel James wrote:
Does this ring any bells with anyone? Is there anything else I should
have tried?
My memory of when multiple monitor support came out, was that the
motherboard/display adapter manual would list supported configurations.
A VGA only monitor sounds very old, does it support HDMI too?
more likely to support DVI ?
Thinkcentre M73
On 14/08/2022 13:24, Daniel James wrote:
It's not that the monitors require VGA (they have VGA, DVI-D, HDMI, and
DP) but that the PC has one VGA and one DP port, so to use two monitors
one of them would have to be VGA.
AIUI, you can daisy-chain DP monitors. You can connect multiple monitors
from a single DP port/cable.
SWMBO has one of those very small desktop PCs that's basically laptop hardware in an old sandwich packet.
It's a Lenovo Thinkcentre M73 Tiny. A fairly vanilla Core i3 box with
an intel H81 chipset. It has VGA and DisplayPort outputs (there's an
option available for an HDMI or second DP output, but not fitted to her
PC).
She's just bought a second monitor. I wired it up to the DP connector
as her old monitor is on the VGA ... and the desktop comes up nicely on
the new monitor, but the old one complains of "No signal" and goes to
sleep. If I unplug the new monitor, the old one works as before.
Windows 10 offers to look for a second display, but says there isn't
one.
The Intel Ark pages for the H81 say that it can support two monitors operating independently at once.
I thought the BIOS might have an option to enable a second monitor, but
it didn't. I updated the BIOS (which was quite old) and it still
doesn't.
I swapped the monitors round (they're the same model) and still the one
on VGA went to sleep if the DP one was connected.
Does this ring any bells with anyone? Is there anything else I should
have tried?
Risking getting shot down here, as this isn't a subject I know comprehensively, but ...
I wonder if there's anything in these articles which might help you
spot the problem?
https://bit.ly/3pghs5x
https://www.computerhope.com/issues/ch000801.htm
In particular, note the existence of a Function key on most laptops
which controls the display when a secondary display is connected
(allows you to blank and enable a projector, for example). Google
(images) "laptop display function key" for examples of what this
looks like.
Have you had a dive through the
BIOS to see if there's a setting to allow dual? And updated the BIOS?
What's the resolution of the monitor in DP mode? It's possible
there's a bandwidth limitation and you can only run two if they're
at the same,
Why is Windows 10 making the VGA monitor go to sleep when it detects
that there is a DisplayPort monitor attached?
In article <tdct49$3hkce$1@dont-email.me>, Chris wrote:
What's the resolution of the monitor in DP mode? It's possible
there's a bandwidth limitation and you can only run two if they're
at the same,
Good thought ... but these are 1920x1200 monitors which is about the
limit for VGA but no great shakes for DP.
They run fine together at that resolution under Linux, so this looks
like a Windows problem.
Daniel James <daniel@me.invalid> wrote:
Why is Windows 10 making the VGA monitor go to sleep when it detects
that there is a DisplayPort monitor attached?
Just a thought, but I wonder if you have appropriate drivers installed?
SWMBO has one of those very small desktop PCs that's basically laptop hardware in an old sandwich packet.
It's a Lenovo Thinkcentre M73 Tiny. A fairly vanilla Core i3 box with
an intel H81 chipset. It has VGA and DisplayPort outputs (there's an
option available for an HDMI or second DP output, but not fitted to her
PC).
She's just bought a second monitor. I wired it up to the DP connector
as her old monitor is on the VGA ... and the desktop comes up nicely on
the new monitor, but the old one complains of "No signal" and goes to
sleep. If I unplug the new monitor, the old one works as before.
Windows 10 offers to look for a second display, but says there isn't
one.
The Intel Ark pages for the H81 say that it can support two monitors operating independently at once.
I thought the BIOS might have an option to enable a second monitor, but
it didn't. I updated the BIOS (which was quite old) and it still
doesn't.
I swapped the monitors round (they're the same model) and still the one
on VGA went to sleep if the DP one was connected.
Does this ring any bells with anyone? Is there anything else I should
have tried?
Mm. I hadn't expected it to be a Windows side issue, but those Intel
drivers are awful so it certainly could be. And the OEM repackages of
them are always even worse, and usually years out of date.
- see if the chipset is in there.
Try the two key combination "Windows key" and letter "P" and see
if that breaks through the problem.
In article <tdesi8$3s0tp$1@dont-email.me>, GlowingBlueMist wrote:
Try the two key combination "Windows key" and letter "P" and see
if that breaks through the problem.
No, that just told me I only had one monitor. It was a driver issue and Jaimie pointed me in the direction of a solution. All working nicely,
now; but thanks.
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