03-27-2012 09:59 PM - edited 03-28-2012 09:20 PM
I recently updated a whole bunch of things on my T520, and afterwards experienced a significant slowdown in everything -- startup time as well as just general work. There's often a long lag when opening programs or documents, right clicking, etc. Part of this seems to be due to higher CPU usage. While idling (i.e. just sitting on my desktop) and looking at Task Manager, CPU usage seems higher than normal on some things -- SynTPEnh.exe will consume 3-8% of CPU, one instance of svchost.exe will take up to 10%, etc. My total idling CPU usage is generally 15-25% now. (I have a quad-core i7.) Also, my battery life dropped precipitously; it used to be upwards of 5 hours on a full charge when just doing general web browsing and word processing, but now it's less than 2 hours.
Going around in Process Explorer and Task Manager, I've found a few things that seemed somewhat unusual: A lot of my processes have many page faults -- slightly under 15 minutes after starting up my computer, SynTPEnh.exe has about 250,000, SimpleTap.exe has over 50,000, the instance of svchost.exe with the Base Filtering Engine, Diagnostic Policy Services, and Windows Firewall has about 250,000, and Process Explorer itself has about 250,000. There were also some items that seemed like they might be taking up more memory (Private Bytes, in Process Explorer) than they should -- dwm.exe is using about 150 MB, and SimpleTap.exe is using about 115 MB. Also, my CPU percentage of Interrupts jumps around, most of the time staying between 2-5%.
I'm not sure what bits of this are actually significant, but there's definitely been a huge slowdown since installing the updates. I'm happy to provide any information that would be helpful in dealing with this. Thanks!
Solved! Go to Solution.
03-28-2012 05:20 AM
03-28-2012 08:13 AM
Was the BIOS upgraded in your system. If its new there would not be an update. but if so enter and check the settings for anything unusual. Save settings since new updates sometime update to CMOS for hardware automatically but still require you to SAVE settings before exiting. Then try again. This only takes 2 minutes depending on how long you're looking around etc.
I hope that helps.You could call support but I doubt they would have anything useful to resolve this.
Check each of the Lenovo apps will load and run without errors. Maybe failed install of a subsystem.
Then I would look at the Event logs for problems right after bootup noting the system time.
03-28-2012 08:31 AM
03-28-2012 09:24 AM
Right click on COMPUTER from the Start button. Select MANAGE and within there you will see Event viewer. Info wil appear after several seconds as logs are loaded. They are group and can take time to understand.
03-28-2012 09:28 AM
Also if this was happening before the update as you seem to be saying. I would verify you Power profile settings.
Select the Performance profile and you don't want the HD to cycle down after x minutes either on AC or battery. That will otherwise insert a large lag in preformance.
03-28-2012 09:10 PM - edited 03-28-2012 09:42 PM
I found out that I had a very high level of hardware DPCs, used the tool LatencyMon to find out what was causing the problem. There were a few things that looked suspicious, and I uninstalled the Ethernet controller driver and reinstalled a different one, which I believe helped the problem somewhat -- some programs that seemed to be using a lot of memory and having a lot of page faults are somewhat better.
Graphics also seemed to be part of the problem, and I uninstalled one of the drivers for the integrated Intel graphics adapter. However, I now cannot seem to install a new driver. In device manager, the items that show up under Display Adapters are the NVIDIA NVS 4200M, and "Standard VGA Graphics Adapter." When I try installing the Intel drivers normally, I get a message saying, "This computer does not meet the minimum requirements for installing this software." I've tried manually installing the driver through Device Manager, but get a message saying "The driver selected for this device does not support this version of Windows." (I did download the x64 version.) I've tried uninstalling the default Windows driver, but the screen flicks off and on and then Windows immediately, automatically detects it and reinstalls the standard driver. How can I install drivers for the integrated graphics??
After uninstalling the drivers, Windows booted to an 800x600 screen resolution, and would only let me increase it to 1024x768. I've worked around it by going to the BIOS and setting the display option to use the Nvidia card, however, when using this the Intel//Standard VGA Graphics Adapter does not show up in Device Manager at all.
03-28-2012 09:39 PM
Also, an update on the DPC latency: I tried going through and disabling things one by one to isolate the problem, and I've traced it back to my wireless adapter, which shows up in Device Manager as Intel WiFi Link 100 BGN. Does anybody know where I could find an older, working version of the driver? Also, how can I check to see what specifically is the problem? TV System Update also installed two things called Intel Network Connections Drivers and Intel Management Engine Components (that's what they're called in the Programs and Features list in Control Panel); could either of those be the issue?