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papadeltasierra
The issue is that a laptop with an HDMI port fails to recognise a Dell monitor connected via either an HDMI/DVI cable or an HDMI/HDMI cable plus HDMI/DVI adapter. This has worked for over a year but recent Windows updates seem to have broken this and now only monitors directly corrected via an HDMI port are recognised.
Can Microsoft please explain how to workaround this and when a fix will be available?
I have tried to debug this as far as I can and can provide this information:
For your info, these are the monitors and TV involved; all worked fine with the laptop until recently:
I'm happy to help with diagnosing this as far as possible (I write software for a living) but I cannot do stuff like reinstalling this laptop as it is being used by my daughter who is doing "university from home" because of Covid.
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Can Microsoft please explain how to workaround this and when a fix will be available?
I have tried to debug this as far as I can and can provide this information:
- For over a year, external DVI monitors connected to my laptop worked fine
- I haven't used an external monitor for about a month, during which there were Windows changes updated; now when I plug in the same monitors, they are not recognised by Windows.
- Windows does not "ping" for new hardware found
- The "Display settings" "Detect" claims there is no external monitor despite the monitor noticing that it is plugged into something
- I originally suspected a graphics driver issue (this is an Intel 920 UHD driver) or a laptop manufacturer driver issue but...
- I have tried various Intel driver releases, including old ones, and the DVI monitors are recognised
- I have tried the manufacturer's own display drivers (it's a Lenovo), including old releases, but the DVI monitors are not recognised
- I have borrowed a recent HP laptop that also uses Intel 920 UHD hardware and this laptop also cannot see the DVI monitors
- Both my TV and a more recent Dell HDMI monitor are immediately recognised and work without any issues.
For your info, these are the monitors and TV involved; all worked fine with the laptop until recently:
- Dell monitor #1, E22WFPc, DVI
- Dell monitor #2, P2317H, HDMI
- Dell monitor #3, P2314H, DVI
- Dell monitor #4, 1704FTPs, DVI
- Panasonic TV, TX-L32E6B, HDMI
I'm happy to help with diagnosing this as far as possible (I write software for a living) but I cannot do stuff like reinstalling this laptop as it is being used by my daughter who is doing "university from home" because of Covid.
Continue reading...