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10 Posts

06-25-2019

United States of America

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Lenovo Y740 screen dimming problems

2019-06-25, 6:06 AM

Hi-

 

I've been running a new Y740 with the GTX2060 and the 144Hz screen since April.  Fairly often when I log into the computer, right as the lock screen comes up the screen will automatically dim.  All I have to do to get it back to normal screen brightness is dim it down one level and then back up.  If I had to take a complete guess, it dims to ~60% brightness.  When I dim down once, it takes the visual level (blue bar on the screen) from 100% to 90%, but the actual brightness seems to come up from the ~60% brightness up to 90%.

 

It's very odd and has been happening for several weeks.  I checked for any auto-brightness settings or auto-dimming settings but haven't found any aside from the settings when you go on battery.  Anyone else have this happen?

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17 Posts

04-02-2019

Estonia

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Re: Lenovo Y740 screen dimming problems

2019-08-15, 6:18 AM

With latest Lenovo Vantagae and NVidia drivers so far it looks like this issue hasn't occurred anymore indeed.

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7 Posts

05-18-2019

Portugal

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Re: Lenovo Y740 screen dimming problems

2019-06-30, 21:38 PM

I have the same problem and it's annoying.

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1 Posts

07-01-2019

India

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Re: Lenovo Y740 screen dimming problems

2019-07-01, 9:41 AM

I was facing the Same issue in Lenovo Yoga500 , went to Service center and they solved when i asked what was the issue , they told replaced the screen flex cable

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2 Posts

07-03-2019

Australia

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Re: Lenovo Y740 screen dimming problems

2019-07-03, 5:11 AM

This happens to me too, surely this can't be a hardware problem. Just couldn't be bothered to reformat again.

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10 Posts

06-25-2019

United States of America

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Re: Lenovo Y740 screen dimming problems

2019-07-03, 15:09 PM

I went home the other night and was going to chat technical support and troubleshoot the issue, but on battery nor on A/C could I replicate the issue.  It's very frustrating but I suppose I will have to be more aware of when it happens.  I thought it might be related to their ambient sensor lighting, but I don't have it turned on.

 

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42 Posts

06-30-2019

United States of America

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Re: Lenovo Y740 screen dimming problems

2019-07-04, 20:59 PM

I know that in Windows settings, in Display there is sometimes an "auto brightness" setting underneath the brightness slider.

 

If there isn't (or it's already off), "power-saving mode" for the display for the iGPU in the Intel Control Panel might result in that weird auto dimming behavior. Turn off the power saving features, and check all the tabs in the Intel iGPU control panel for anything that has to do with power saving, and turn it off.

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10 Posts

07-01-2019

United States of America

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Re: Lenovo Y740 screen dimming problems

2019-07-05, 21:08 PM

I have this issue also. I've tried everything from windows settings to the lenovo vintage settings. My laptop is always plugged in. I have the 17inch version.

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11 Posts

07-05-2019

United States of America

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Re: Lenovo Y740 screen dimming problems

2019-07-06, 2:22 AM

I have the exact same problem, and I noticed it since the beggining. It seems to me a software issue. Happens mostly after I open the lid, or when starting a videogame. I believe it dimms to 75%.

If I use the Fn key + brigthness key up nothing happens, if I do the same for brightness down brightness goes to 90%, then I go back to 100%. In other words, I can't increase the brigthness back to 100% unless i decrease it first, very annoying. Seems to me like a software related issue.

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10 Posts

06-25-2019

United States of America

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Re: Lenovo Y740 screen dimming problems

2019-07-08, 14:22 PM

When I try to open the Intel Grahics Control Panel, it just says I don't have an Intel GPU.  I don't know if that's true, since I believe all Intel CPU's have a built-in GPU.  I'll have to check that.

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10 Posts

06-25-2019

United States of America

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Re: Lenovo Y740 screen dimming problems

2019-07-08, 14:23 PM
Agreed, it's only after opening the lid and only after a restart or when waking from sleep/hibernation.
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