Choppy Sound, Video and DPC Latency Issues

[craigmanutd]

Thanks for the replies again... I've got to say that unfortunately (and unbelievably!) I'm still having these issues! I'm not wanting to accept defeat with this but with the amount of uni work I have on i'm struggling to find the time to really fix this (without bricking my computer trying haha).

In reply to Deep Dose its at least reassuring that I'm not alone in this, in that at least we both know our laptops aren't broke in some way!! I feel your frustration though! This is meant to be a high spec laptop, but this one at the minute struggles to do anything! I still haven't found an Nvidia driver that agrees with this thing. As a bit more help, I suggest you try downloading a program called latencymon.. its like dpclat but better because it shows you which drivers are actually causing the problems! If you could let me know what your problem drivers are that would be a huge help!

And to ttomorad, its interesting you say that! I actually tried that about a month back! One of the problem drivers with me is ACPI.sys at something ridiculous like 3.2 ms on latencymon!! I disabled the ACPI-Compliant Control Method Battery and it did help!.. but it isn't the only driver causing fault. Obviously the nvidia driver nvlddmkm.sys had an execution of 1.4 ms, ndis.sys was at 2.2 ms and something called ataport.sys was also at 1.4.

This meant that although it helped, it wasn't enough and it was more trouble than it was worth turning it off.. whenever I forgot to plug my laptop back in it just shut off without warning because I didn't know the battery level haha!!

So (very) long story short I just don't know where to go anymore! There's too many drivers causing problems and since the time of the first post i've had the hard drive changed and obviously a fresh Windows install, proving that its not a dodgy install. I'm clueless, any help is great!

[ttomorad]

I had major problems with my DPC spikes on my 7720G and I did a lot of research about this. Today I still have high DPC's but not as frequent as before, the biggest improvement was after BIOS update and latest chipset drivers. Also, disabling Wi-Fi card in Device Manager shows a very big difference, some users said that disabling your CD/DVD drive also has major effect, I didn't see any in my case. Try disabling everything you can in Device Manager and see what happens; Bluetooth, Wi-Fi, FireWire, webcam, anything you can find, but get the latest chipset drivers!

[craigmanutd]

Hi again, right I've practically finished uni now and my next big thing is getting this laptop working properly without spending any money on it!! So I just thought I'd bump this thread to help me fix it, hopefully thats ok!

I must have tried every suggestion in this thread at least twice and loads of my own ideas to sort this problem out so any and all suggestions from anyone (especially with the same laptop) would be massively helpful

I'm so determined to sort this!!! Thanks for any help!

[ttomorad]

The best you can do with this machine is to get your DPC spikes to a minimum, but you can forget about eliminating them 100%, i'm sorry to say but it looks impossible after all I tried with mine.

Sent from my GT-I9300

[craigmanutd]

Your right I really am so close now to accepting defeat on this one, I never thought I'd get rid of all the spikes but some of the major ones that make videos and music playback such a nightmare drive me insane! I might even get on the phone to acer now and their wonderful Indian help desk to see if that gets me anywhere haha! Last time they took my old laptop off me for 3 weeks and sent it back unfixed but desperate times, desperate measures they might be better this time!!

Thanks!

[ttomorad]

I was dealing with DPC spikes for about 4 years in total, the best you can do is to disable as much as you can in device manager, Wi-Fi, battery management, even the DVD drive, but spikes will never be gone. For a long time I thought that the solution was to disable dynamic FSB switching, thermal throtling, but since modded BIOS for 7720 came out it was clear that this is a hardware issue afterall.

Sent from my GT-I9300

[ttomorad]

I am sorry to say this, but if you need a machine without any DPC latency issues, buy a Macbook. I love Acer and I learned a lot from my 7720 about modding, fixing, upgrading laptops, but Macbook Pro was the thing I needed to work with music without problems, the way I wanted from the start.

Sent from my GT-I9300

[niffcreature]

You can also just buy a laptop of a better brand with integrated graphics and the likelihood of DPC latency issues is much less.

Maybe this can help, not sure if you've tried everything already though:
http://www.idmforums.com/showpost.ph...62&postcount=1

[ttomorad]

Nothing new to me in that link But, if you want your DPC spikes as low as possible you should go with XP rather than Win 7.

Sent from my GT-I9300