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Dell 2405FPW Problem - Mouse lag
Immediately after connecting my new Dell 2405FPW I noticed that the mouse was not as responsive. I believe this is related to hardware cursors and nVidia drivers. I've tried various versions but no resolution. Downticking the hardware acceleration to disable hardware cursors seems to correct the problem or at least make it a lot less noticable.
Heres how you can verify this problem, it's very very subtle and is more of a 'feel' thing than something you can easily see:
Open a Notepad window
Grab the lower right corner and drag the mouse back and forth.
Watch the cursor, does it 'stick' to the window frame or does it sorta rubber-band away/closer as you move faster/slower?
Disable hardware cursors by going to the display control panel troubleshooting tab and reduce the hardware acceleration slider 1 tick.
Repeat
You'll notice that the cursor now stays right on the window frame.
While the lag is not REAL bad, it's quite annoying when you 'move in' on a button as I find myself overshooting the button and it just feels very weird.
I'd like Dell to confirm this problem and if they can confirm this, please brind the issue up with nVidia to have them diagnose it and correct the problem!
Video card is an nVidia 6800GT based card, PCI-Express. Mouse is a Logitech MX1000 connected via USB directly to the motherboard. The latest mouse drivers, chipset drivers and video drivers are all installed.
Heres how you can verify this problem, it's very very subtle and is more of a 'feel' thing than something you can easily see:
Open a Notepad window
Grab the lower right corner and drag the mouse back and forth.
Watch the cursor, does it 'stick' to the window frame or does it sorta rubber-band away/closer as you move faster/slower?
Disable hardware cursors by going to the display control panel troubleshooting tab and reduce the hardware acceleration slider 1 tick.
Repeat
You'll notice that the cursor now stays right on the window frame.
While the lag is not REAL bad, it's quite annoying when you 'move in' on a button as I find myself overshooting the button and it just feels very weird.
I'd like Dell to confirm this problem and if they can confirm this, please brind the issue up with nVidia to have them diagnose it and correct the problem!
Video card is an nVidia 6800GT based card, PCI-Express. Mouse is a Logitech MX1000 connected via USB directly to the motherboard. The latest mouse drivers, chipset drivers and video drivers are all installed.
- I received a response back from eVGA (I have an eVGA 6800 GT, PCI-Express) and they alluded to the fact that the card is a single link DVI and this monitor requires dual link....which I find to be false since Dell clearly shows many single link DVI cards as compatible...and if this WAS the case then it should work via Analog at the very least (Something I actually haven't tried but which makes no real sense since I am getting a full desktop image just fine, it's just the mouse movement that is a problem).
So, so far, it's just been a bunch of fingerpointing with no real information.
I suspect nVidia has a driver bug somewhere and since not a lot of people are using 2405FPW's or such large displays they're not getting enough feedback about the problem. Also, the problem is so subtle that a typical non-anaal (An/\L is a bad word in this context?! pfffft) person might not notice it. (But the differences are clearly visible if you do my tests above, even to a typical user) - And just for clarity regarding eVGA's silly cop-out saying the card can't handle 1920x1200 on DVI, here is some information on DVI:
http://en.wikipedia.org/wiki/DVI
As explained here single link should be good up to 165 MHz, 1920x1200@60 Hz should be at around 154 MHz whereas 1600x1200@60 Hz would be 161 MHz. So why in the world would single link work with 1600x1200@60 but not 1920x1200@60? Certainly isn't a single link/dual link issue... That response they sent me really unrinates me off. EvilZardoz
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Posted August 9th, 2005 09:00
I notice this problem on the panel and it affects more than mouse movement - it's not apparent on my Dell P1130 (Sony G520 rebadged) CRT at 1600x1200 at 60 or 100hz. That screen will also sync at 1920x1200 at 60hz - same as the Dell - so I set it up accordingly. Used the analog connector on the panel. Plugged the CRT in, tested it, plugged the LCD in, tested it - LCD is noticably more laggy than the CRT.Interesting!The lag I've been testing for and been able to replacate is discovered by moving windows around, not using the mouse but using the window position as a judge of how quick the panel responds. Adding the mouse cursor in there for nvidia cards does make it seem worse, especially given that most people haven't tweaked their graphics drivers to tell windows (and the mouse driver) to use a higher polling rate so they move their mouse faster, which gives more of a lag effect.I also notice it on ATI cards. I guess the nvidia driver issues just amplifies the issue.Message Edited by EvilZardoz on 08-09-2005 05:44 AM
- Hello, I'm not sure if this is the same problem; my experience was with the 2005fpw and a dell computer with the nVidia 6800 graphics card, both of which I recently bought.
I noticed the pointer just felt like it was dragging across the screen no matter how fast or how far I moved the mouse. I went into the mouse settings (winxp) Start-->Control Panel-->Printers and Other Hardware-->Mouse, selected the tab at the top that says "pointer options", in the motion section I moved the slider all the way to the right (fast), and the mouse/pointer have been acting normal now. EvilZardoz
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Posted August 10th, 2005 11:00
I have never owned or used a 2005FPW however I'm told that the 2005FPW panels exhibit the same issue ... they also use the same gm1601 image processor.I've made arrangements to return my panel today. It's all boxed up again.I had this very same problem.
I fixed it by setting my screen on 100Hz in windows, I know 2405FPW only does 60Hz on 1920x1200 but it works for some weird reason.
I have an ati card so i don't think it's a video card driver problem (since you have a nvidia).
I also had my usb set on 500Hz but that didn't fix the problem.
I hope dell will take a look at this because i know other people with the same problem.drew-and-not-u
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Posted August 10th, 2005 15:00
It's probably just the drastically higher resolution on the 2005fpw compared to your old one. Since the desktop is so much larger it would feel like your mouse wasn't moving quite as fast. You can just turn up your mouse sensitivity to compensate.- It's not sensitivity, it's how the mouse responds to movement, you can feel yourself overshooting buttons and SEE the lag when you drag the corner of a window frame, as stated in my original post. If the PANEL was lagging, both the window and cursor would lag the same amount, in sync. It's obviously some driver issue with higher resolution displays on the DVI output.
I got into the factory menu and disabled 'ISP Mode' but I believe this is just 'In-Situ Programming' which is just a way to update the firmware etc and shouldn't have any effect on the display.
ChemOp
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Posted August 8th, 2005 05:00
I had the same problem. Go to this site and download this program and run it. After I made my adjustment up to 500mhz or 1000mhz I had no more lag.
http://www.tcmagazine.info/downloads/usbmrs11.exe
Message Edited by ChemOp on 08-08-2005 02:37 AM