Disappointed with LED LCD in E6400

One of our previous discussions concluded that the brightness of the LEDs is controlled by rapidly turning them on and off. The problem is that at low brightness the off period is long enough for some people to notice. I've seen it at minimum brightness and use a setting one step higher, which seems OK to me. Any flicker is more likely to be noticeable on displays with light backgrounds, which web pages often are. However, it is not as hard on the eyes as the monitor flicker of, say, 15 years ago.

John

 

Did you calibrate them?

Is it like this http://www.lagom.nl/lcd-test/inversion.php?

 

I ordered an E6400 6 months ago and it came with the LG screen. The flickering at the lowest brightness setting was very noticeable. I ended up returning the laptop because of that and a couple other reasons.

I have also owned an XPS M1330 for the past year and 4 months. That laptop originally shipped with a CMO screen that was very poor quality, grainy texture, flickering at low brightness, and there was a problem with the chip used for the screen in that the brightness would always reset to max after rebooting the system. I had it replaced with a Toshiba LED screen which is beautiful, very clear and good color, no flickering whatsoever at lowest brightness setting, no resetting to max brightness if software is configured correctly.

So, LED screens can be manufactured without the flickering, it just depends on the manufacturer and how they made the screen. I recently used a Dell outlet coupon to purchase another E6400 (beast of a machine with 8gb ram, P9500 CPU, discrete graphics etc., all the bells and whistles) and the total came in under $1100. The deal was to good to pass up. I just have my fingers crossed that the screen is better on this one than the last one.

 

Nope, the screen brightness will adjust a wee bit on its own depending on the content displayed on the screen. The 'twitching' is obvious when you are scrolling through pages with various content like dark and light colours, and random images here and there.

If the content is static, the screen brightness does not change at all irregardless of my brightness setting, and there is no flickering. Hmmm.

 

Do you have the ambient light sensor on to automatically adjust brightness? That may be causing the twitching.

 

check power options under the intel graphics menu. turn them off. thats what it is for sure.

 

Sony is not much better.

 

I always calibrate new Laptop and Desktop LCD's.

 

This is a possibility, but there is also a "Reduce LCD Refresh Rate" option under the Extended Battery Life aettings of DCP Power Management. I would start there. I'm sure it used to say 40Hz somwehere, which would be noticeable.

Also, if you haven't got the latest (A11) version of ControlPoint System Manager, then get it.

John

 

Okay, I got my E6400 and I've been playing around with it the past few days. The screen HardwareID is SEC442, which I believe is a Seiko. I'm very sensitive to the flickering and I am not seeing any flicker regardless of brightness, unless I am looking at a screen that is all light grey in color. A huge improvement compared to the LG screen I used 6 months ago. The whites are very clean and there is no mesh pattern or anything like that.

I've got Kubuntu 9.04 installed on it and everything is working out of box except for the finger print reader. Very happy with the screen and the laptop in general.