Optiplex 790 Pci Serial Port Driver
Waldemar Fischer
THe serial port driver, and something else called "PCI Simple Communications Controller" (possibly a modem on the motherboard) are listed as "other devices" in the device manager, with yellow exclamation marks in the icons meaning they have no drivers installed.
Dell does not list any drivers on their usual website where you enter your service tag. I am pretty sure this is a standard Intel Q## chipset. Does anybody know which one exactly, and where I can get the chipset drivers and particularly, the serial port drivers, for 64 bit Windows 7?
1) Install the latest chipset drivers from dell's site.2) If that doesn't work, install the latest networking drivers from dell's site.3) If that doesn't work, install the latest video card drivers from dell's site.
Go to Dell's support site and look up 745C drivers under "Chipset". Download the last 2 drivers and install them in your Dell driver directory under Intel PCI Driver Management. Use these to update the drivers in the Device Manager and problem fixed!
I have just bought a Dell Optiplex 5000 which immediately performed very poorly and had issues rendering a Dell screen properly (tiny white dots and blurred graphics). After a number of hours online with Dell I nailed down the issue as the Intel UHD 770 graphics driver. Uninstalling the driver from Display adapters within Device Manager immediately fixed screen rendering issues and performance issues. On reboot the graphics driver is reinstalled and I have to go and uninstall again. I have tried updating the latest version of the driver and looking for other drivers that may work better.
Has anyone else had similar issues and come up with a solution? I am quite happy just to bin the driver as it work miles better without it - just not sure how. Not a major issue as I can uninstall each time I reboot, but there has to be a better solution.
The driver came pre-loaded on my DELL. I then downloaded the generic driver from Intel and installed this. Both drivers give the same issue. I then had an event message "The start type of the igfxn service was changed from disabled to demand start." which has reinstalled the driver again, which I have had to uninstall again! All very confusing and annoying.
I have run the DELL and Intel driver updates and neither resolve the issue. The only way I can get the system working effectively is if I disable the Intel UHD Graphics 770 driver from Device Manager. Once disabled the system works perfectly. If I uninstall the driver it re-installs when rebooted and I have to disable. Once disabled it remains so even on reboot.
Yes this issue occurred as soon as I plugged in the monitor to the Optiplex. I have also tried another monitor which also has the same issues. I have tried various combinations of cables and all give the same issue.
I currently have the driver disabled and the system works fine - so it is just using the Microsoft default graphics driver. Not sure whether this has any knock-on effect but it does not seem to cause problems with anything I am currently doing, although the vast majority of work is static screens, no real video or games usage.
After reviewing this issue, it is very unlikely this issue is related to the graphics driver, especially since the same issue happens even when using the drivers provided by the OEM and on a different monitor. As well, if you need to disable the Intel UHD Graphics 770 and use the Microsoft display driver in order to get it to work, it points out to be a hardware related issue.
I have only used a cable connection to the monitor. The only cables I can use are DisplayPort to HDMI and USB to HDMI as I have no other ports available. I have two DisplayPort ports on my Optiplex and only one works - which possibly points at an issue with the hardware in the PC.
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I see that on my Surface Pro 6 the HDMI stops functioning on the current update.
I tried the Surface Diagnostic Toolkit and it once corrected the issues ( about 4 weeks back) but then the issue again resurfaced and the tool kit was of no use.
I then reset the device. The HDMI external monitor worked till the cumulative updates were applied and then it stopped again.
I'm unsure if this will help anyone, but on my laptop, in Device Manager, Windows 11 had disabled both of my Display adapters: AMD Radeon(TM) Graphics and NVIDIA GeFore RTX 3060 Laptop GPU. I right-clicked on them and clicked Enable, and instantly my monitors connected again.
Happened to me as well after latest win 11 update. Tried everything. Nothing worked. Still no HDMI output. It is win 11 as nothing described by others was the problem. Display adapters are on and working, etc, etc.Microsoft is negligent.
This bug is impervious to logic.
Has been working fine for months. Suddenly stopped yesterday.
Driver says it doesn't need updating.
Have updated every system option in sight.
As a last resort, I uninstalled the secondary HDMI monitor.
Windows 11 now does not detect it.
(It detected it just fine when I first brought up the computer,
lo these many months, so I suspect a bug in the latest Win 11 update.)
Thanks a lot! The "SOFT" vs "HARD" reboot, solved my problem too! Basically, I tried reinstalling drivers and whatnot but to no avail. However, I just did "Shut Down" instead of "Restart" and now the HDMI port is working again. My monitor is being detected!
Hi Eric, thank you so much for posting your solution! I tried all of the typical approaches described above and on other sites, but none of them actually worked :-( I was almost ready to give up and reinstall the entire system, when I came accross your post. Glad I found it! I then tried hard reset (long press of power button) and after fresh new start IT WORKS! Thank you, you made my day :-)
BRUH been updating drivers automatically, manually, every freaking thing I found for more than 4 hours and the HARD reboot was the only thing I probably had to do. You saved me hours and hours of frustration. Thank you.
Option 1.Try Rolling back if you have an option:
Go to Device Manager by typing in Devmgmt.msc in Run dialog box.
Navigate to Display devices and right click ATI Radeon HD or Similar device you have. Choose Properties.
On the Driver tab, hit rollback Driver to go back to the previous version.
Disclaimer:
Guru3d.com is a non-Microsoft website which would provide accurate and safe information. Watch out for ads on the site which are frequently classified as a PUP (Potentially Unwanted Products). There is no need to buy paid products to fix your computers as they do more harm than good sometimes.
As someone who had this problem early on, I can say that this is the best answer I have seen. I solved mine in a similar way but didn't have this at the time. For anyone encountering this issue, start with this.
Microsoft should just admit that the latest update sucks instead of letting ppl trying some useless stuff (tried everything with no luck). this happened right after the latest updates. now I bought a lightning to HDMI adapter for my iPhone, now my external monitor is working like a charm.
It can be issue with Display drivers as they are responsible to Multiscreen (Extended display) output from Windows I will suggest you uninstall Display drivers from vendor's website and download latest drivers and install it on your Surface device.
Setting up a Samsung monitor is straightforward, yet maximizing its quality goes beyond mere cable connection. For an optimal experience, consider the types of physical connections, necessary drivers, and picture settings. Once connected and powered on, you can fine-tune these settings according to your preferences.
If your device and monitor ports don't match, an adapter or dongle is necessary. The adapter's quality dictates connection quality; for example, a VGA to HDMI adapter can only transmit VGA-quality signals. For laptops, verify if you need a "micro" or "mini" version of the port and choose the appropriate adapter.
Position your monitor away from heat sources and potential liquid spills. Most models require assembling the stand, as detailed in the user manual. Without needing to power off your computer, connect the monitor to a power source and then to your computer using the chosen cable and adapter if necessary.
Monitors typically do not require manual driver installation, as modern operating systems manage this. For specific features or troubleshooting, refer to the user manual or manufacturer's support. Adjust the refresh rate and picture settings, such as enabling Eye Saver mode, for optimal performance and comfort.
These first few steps may seem trivial; however, it is easy to forget the troubleshooting basics during times of frustration. Before you start any significant repairs to your device, please check the following:
Batteries are nefarious. They often fail due to their "consumable" nature. Although they typically die slowly and with diminishing power on time, a bunk battery might refuse to be recognized or charged.
NOTE: Depending on the age and operating system on your laptop, Dell designs the BIOS to block 3rd party batteries from charging at the firmware level. This is most notably found to affect newer models such as the E series and poor clones of the OEM battery until good clones which trick the BIOS are readily available. If the system detects a 3rd party battery and the laptop shuts charging down, the resolutions will vary somewhat. Some laptops can be disconnected and reconnected if it occrus while others require you to remove and reinstall the ACPI Windows driver if it is also blocked in Windows due to a BIOS level block.
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