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Does Your LCD Play Catch-Up To Your Mouse?
Dishes of Ryan writes "I fell in love with the idea of an LCD monitor, so I ended up buying a nice, shiny Dell 2001FP. However, nowhere, and I mean *nowhere* did I read about LCDs having an input lag on them. For instance, if I scoot the mouse across the screen, there is a noticeable delay between when I move the mouse and when the cursor moves. To prove it to people, made a video showing exactly what I mean. You can almost forget being king of the hill on twitch FPS games like Unreal Tournament. Are there any other Slashdotters out there that are as annoyed as I am? What did you do?"
I'll second this. I'm running a Sumsung 193v flat panel bought at Sam's club, on an old dual PIII-800 with an NVIDIA GeForce FX 5200 card.
No lag here, at all. And this stuff ain't exactly cutting-edge.
Did it occur to you that maybe you have a hardware problem with *your* system?
I just thought of something you might want to try. LCDs are a bit different than CRTs in that they are completely digital. Since the monitor is digital, it sometimes requires calibration when used with an analog connector. Check your manufacturers specs for the EXACT resolution AND refresh rate that they recommend. The monitor will run in other modes, but it supposedly won't do them as well.
:-)
Once you've set your resolution and refresh rate, be sure to use the auto-adjust button if your monitor has it. When I first got mine, I thought the picture looked like crap. Then I found the auto-adjust. With a push of a button, I suddenly saw the crispest text I'd ever seen in my life. Quite an improvement over CRT displays.
Javascript + Nintendo DSi = DSiCade
It's the buffering in the driver.
Flat Panels *will* ghost and blur, however they do not lag.
What causes this is buffering of execution commands in the drivers, which makes some games at certain resolutions lag really really bad on input.
Change drivers, and it will usually go away.
I've used lots of LCDs, including plenty of DELL LCDs. The LCDs we've used at work were faded, and the colors looked awful after a copule of years. but I've never never seen any kind of lag like this in any kind of monitor.
My guess is that there is something wrong with the video drivers, or the mouse drivers, or some other part of his computer that's causing these problems.
I can't see the vid because the file is apperantly slashdotted.
autopr0n is like, down and stuff.
rtfa?
the lag is not coming from that.
hell, just read the damn blurb.
here's for the stubborn people:
two monitors, fed from the same computer. other one is some flatty dell and the other one is a crt. now, the movie is about doing something with the mouse that affects both screens, and happens at the same time in the video cards memory, and having observable(with a vid cam..) lag between the two monitors.
world was created 5 seconds before this post as it is.
http://www.vtnetworks.net/CrtLcdComparo.wmv
Site Mirror: Click here.
Video Only: Click here.
If I autoadjust while showing normal windows, the bitmap will usually still have fuzzy areas when I pull it up. If I autoadjust while the bitmap is being displayed, the monitor is able to lock onto it perfectly. The text looks noticeably better with a perfect lock, especially when using sub-pixel sampling on the fonts, which needs pixel-perfect alignment to work properly.
I have a shortcut to this image on my systems because I have a KVM switch, so I need to autoadjust a lot. No two systems have the exact same video timings.
UT2004 specifically has two options:
1: Smooth Mouse
2: Reduce Mouse Lag
The normal usage of USB mice should be fine without lag, but when the computer is using all of its resources, USB doesn't get updated as quickly as it should, thus causing the mouse lag.
PS/2 mice have better access to Windows resources and the mouse position gets updated properly and on time.
I am defenseless. Use your button. Mod me down with all of your hatred.
sub-pixel sampling on fonts does not work very good at all unless you use a DVI connector for your LCD. I changed from a VGA to a DVI connector on my LCD panel at work and the difference is astounding. I'm still amazed that 90% of consumers are completely oblivious to this difference. Not to single you out specifically, but I'm tired of the average consumer being ignorant of the differences between video connection standards.
BTW, companies now make excellent DVI/USB KVM switches, so there is no execuse to use a VGA connection on a LCD panel anymore.
For some reason, all of my games ran like crap after picking up the display... Game after game simply ran like a slug after the LCD was added to the mix and I couldn't figure out what the problem was.
I finally noticed that if I took my hand off the mouse, things ran smoother.. After some trial and error I discovered my first generation optical Intellimouse Explorer didn't like the USB hub on the Dell monitor (I plugged it into the 2001FP's USB ports to add some slack on the mouse cable). While the problems were not readily apparent on the 2D apps, they were incredibly apparent in the games.
So after moving the mouse back to the PC's main USB ports, everything improved dramatically. It gave me an excuse to pick up that new fancy Logitech laser deal.
www.lonseidman.com
You can probably do the same thing with Gimp, but it's not immediately obvious to me how to do it.
It displays Pascals triangle.
No it doesn't. It's not Pascal's triangle. It's Sierpinski's triangle. Pascal's triangle is such that the ith row gives the binomial coefficients for the expansion of (a+b)^i. Sierpinski's triangle is a made by drawing a triangle and recursively joining the midpoints of its sides. Pascal's triangle is chiefly an algebraic entity. Sierpinski's triangle is chiefly a geometric/fractal entity.
Time flies like an arrow. Fruit flies like a banana.
This was a big problem with passive matrix screens. I've had old-school (black and white) PowerBooks that did this, and my first ThinkPad (365X) did this too.
However, I have *zero* problems with this on any active-matrix screens I've ever worked with. ThinkPad 600E: lovely, crisp screen, no lag, cursor right there where you want it. PowerBook G3: the most awesome LCD I've ever seen this side of a Cinema Display. I even have a cheapy Taiwanese 15" LCD panel, Envision is the brand, and it's splendid. No lag, no lost cursors, nice and crisp.
That sort of thing shouldn't happen with a modern TFT active matrix screen. There is something very wrong with it.
Knowledge is power. Knowledge shared is power multiplied.
Megane said:
> I'll bet the monitor in question is connected
> with a VGA plug
And Zorilla responded:
> That Dell monitor is probably a rebadged Samsung
> or LG.
Megane,
I have one of the Dell 2001FPs connected via a VGA cable (it's on a machine that doesn't get used for much gaming so it's connected to a slightly older video card) and I haven't notice a lag when moving the mouse (although I'm in front of my Hercules right now, so I can't actually test to see if the Dell shows the symptoms displayed in his video).
Zorilla,
You're partially correct. The Dell 2001FP contains a LG.Philips LM201U04 panel. The rest of the monitor is Dell designed; although not Dell built.
The following sequence seems to do the trick w/ GIMP 1.2.x:
That should get you a checkerboard pattern on a 1-pixel increment. I haven't seen what this does for an LCD monitor's ability to fine tune an analog signal (since I don't own such a display), but I think it's the pattern you're using. It's the same fill pattern the old monochrome Macs used for their desktops. LOTS of edges to sync on, on every line! :-)
--JoeProgram Intellivision!
I'm at work right now, and I have two Dell 2001FPs running dual-monitor. I was able to replicate *exactly* what's shown in the video--when dragging a window that spans both displays, the window moves faster on the primary display (on the left) than on the secondary display (on the right).
It's not the monitor. It's not CRT vs. LCD. It looks like that's the way Windows deals with multi-monitors.
I humbly suggest that the article submitter swap his displays and use the LCD as primary, and see if the CRT then displays the lag. Bet you dollars to donuts that it will.
If you're running games at the native resolution of your display (1600x1200), the most probable reason for the lag you're seeing is that your video card simply can't keep up. It takes a pretty beefy video card to push that many pixels per frame. Try cutting the resolution to 800x600 and see if your results improve.
Another thing to try would be toggling the "vertical sync" option in your video card's advanced properties. This option specifies whether your video card synchronizes frames with the monitor's refresh. Your CRT probably refreshed at 100Hz, and your LCD is probably just 60Hz, so vertical sync could be slowing you down even if you haven't increased your display resolution.