Question Keyboard key presses are very delayed or entirely unresponsive

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Troika

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Oct 17, 2014
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I have a Dell Precision M6800 that I've had for several years now and its given me very few issues to complain about. This one is by far the most annoying and I can't figure out what's causing it. Any time you press a key, its very slow to respond and typing at a regular pace doesn't yield several delayed keystrokes, often it just doesn't register any keystrokes at all. This behavior presists in bios as well.

Things I've already tried:
Reinstalling Windows 10
Trying a different OS (Win 7 & 11, Ububtu)
Replacing keyboard
Replacing motherboard
Replacing cpu
Replacing gpu (I happen to have other MXM cards just lying around)
Replacing/removing storage devices
Removing other add-on cards (WiFi module/Cellular Modem/etc)

I'm genuinely just stuck. Anyone else come across this issue before?

System Specs:
Intel i7 4910MQ (Undervolted with Throttlestop)
32GB DDR3-1600 Ram
AMD Radeon Pro WX 7100 Mobile 8GB (Modified vBios for lower power consumption and consisitent clock speed)
2TB Orico ZH-10 mSata
3x1TB Teamgroup T-Force Vulcan Z
Intel Wireless AC-7260
240w power adapter
 
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COLGeek said:
Does this behavior occur when using an external keyboard?

Also, if you booted the system with a Live Linux distro (from a USB drive, you don't need to install it) does the behavior happen then?

Intent is to isolate whether a hardware or software issue.
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No, when using an external keyboard (usb or bluetooth) it functions normally.

And yes, the behavior is present when using a portable OS. I have a Windows live image as well as a Ubuntu one, both have the same issue when using the laptop's keyboard. As I stated, the behavior is also present when interacting with bios so it shouldn't be a driver related issue.
 
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COLGeek said:
I agree, you have a hardware issue. When you replaced the keyboard, did that include the ribbon cables to attach to the motherboard as well?
Click to expand...
Yes, I even replaced the cable with a new one incase there was an internal break that wasn't obviously visible. I took everything out of the laptop other than a single stick of ram and removing the gpu and all other expansion cards. The same issue still persists. I genuinely have no clue what could possibly be causing this. The only thing I haven't replaced at this point is the display panel and I REALLY rather not do that.

I'm just gonna shelve my Dell Precision and swap over to a old Clevo laptop that I picked up last year.
 
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