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G750 Auto contrast is driving me nuts!!

kidfromhell
Level 9
I guess everyone knows about the issue I'm talking about and we'll proceed.

I have a G750JX-DB71 and I've been facing this issue right from the day I received my laptop. I've done tons of research and still the problem was unsolved. Changed Windows Power Management Settings, NVidia Dynamic Contrast Enhancement Settings, Stopped Sensor services using services.msc, uninstalled Power4Gear Hybrid and changed power plan settings as well. That's it when I switch to battery, this problem starts again. Even now whilst typing this, the contrast has changed causing a pain.

Finally, I did a CLEAN installation of Windows 8.1 and sigh, it's still there. But didn't install P4G and all. I'm with Nvidia driver of 327 I guess. I dunno what to do. Even when switching tabs in Gmail, the contrast changes due to the theme applied.

Finally, I contacted ASUS and they have provided me a RMA. As I'm new to USA, I do have some issues in sending my notebook to them. Issues in the sense, I can't travel to FedEx office carrying this monster packaged in a box. So this is my last try and I've brought the issue again to you guys. If it's possible do help me, or else I have to send it I guess. I dunno how much time will they take to process and send it as my entire studies depends on this one. I can't wait for long. I'm also worried that they might send me a refurbished one if they can't sort this issue out.

Also as I don't have any P4G and such, I begin to guess that I might have got a faulty display. Is it so? Do you guys advice me to go for RMA?

Update: Video added!

https://vimeo.com/87343067

Thanks Pat for the clip!

***** PERMANENT SOLUTION*****


ADVANTAGES:

You'll lose this contrast issue, FOREVER!!!

DISADVANTAGES:

You'll end up using a very old (6 months I guess) NVIDIA Graphics Driver so you might lose out on bugs and patches, performance improvements etc.

STEPS:

1. Go to Asus 750JX driver download page.
2. Select Win 8 x64 for the OS (Not 8.1)
3. Download this VGA driver (NVIDIA Version V9.18.13.1193 - The first one)
4. Install (When installing check custom install and select 'clean install')
5. Reboot
6. And voila, the problem is gone forever.
7. Don't forget to go to GeForce Experience and uncheck all the automatic updates or this sneaky little software might update you to new drivers silently and you'd have to repeat the steps again.

THIS IS THE PERMANENT SOLUTION, FOR NOW UNTIL NVIDIA RECOGNISES THIS AND FIXES IT. SO THIS HAS A FAIR SHARE OF DISADVANTAGES AS WELL!!
166,483 Views
200 REPLIES 200

iammax
Level 7
Still looking for a solution to this... as has been said, it's not an optimus/integrated graphics issue because not all the models have integrated (mine doesn't, and I still have the dimming/auto contrast issue when on battery).

Light
Level 7
I installed version 311.83 and the issue still exists. In fact the issues exists in every version I've tried.

To reproduce simply perform the following actions:

Open the "NVIDIA Control Panel"

Display -> Adjust desktop colour settings

Use NVIDIA settings

Brightness 0%
Contrast 0%
Gamma 0.50%
Digital vibrance 15%

Apply

Use power button to Shutdown
Use power button to Start

Screen contrast changes from high contrast to lower contrast then high contrast.

Would someone in ASUS support please respond as soon as possible as to why this is happening ?

cl-Albert
US Customer Loyalty Agent
Light wrote:
I installed version 311.83 and the issue still exists. In fact the issues exists in every version I've tried.

To reproduce simply perform the following actions:

Open the "NVIDIA Control Panel"

Display -> Adjust desktop colour settings

Use NVIDIA settings

Brightness 0%
Contrast 0%
Gamma 0.50%
Digital vibrance 15%

Apply

Use power button to Shutdown
Use power button to Start

Screen contrast changes from high contrast to lower contrast then high contrast.

Would someone in ASUS support please respond as soon as possible as to why this is happening ?


Light, I don't know that this problem is happening for everyone on every G750JW/JX unit, and appears to be rather elusive at this point on the ASUS side as far as I can tell.

Unfortunately, I don't have either of those units around right now to play with, but when I had the G750JW, this issue wasn't noticeable on my unit although I wasn't looking for it if it matters.
By the way curious if the NVidia Control Panel settings you provided are the defaults or what happens if you use the default settings.

Anyway, I'm not so sure that ASUS repair has been able to catch or see the problem, so suggest working with them or your local ASUS support especially if you are still under warranty.
If you can actually show ASUS repair the issue in person, this would probably be best, but if you are able to tell them how to catch the problem, this should hopefully be good enough although they will probably want you to send back your unit for repair.

http://www.asus.com/support/callus

If you haven't looked through all the posts in this thread though, consider checking them as well to see if they can help (remove Power4 Gear, disable adaptive brightness, etc.) for your case.

If ASUS repair is able to catch the issue though, suspect they would first try to erase and reinstall Windows to see if the problem is still there and then update to the latest drivers posted on the ASUS download site (as well as bios which you may not want to fool around with if you don't want to take any chances), so something you may want to consider trying as well if you think it's a good idea (don't remember if people have reported trying these things already, but expect our repair would try them anyway to try to eliminate any software-related issues).

Well, hope this helps and makes sense. Sorry that I'm not able to help more on my end or provide a solution.

Light wrote:


To reproduce simply perform the following actions:

Open the "NVIDIA Control Panel"

Display -> Adjust desktop colour settings

Use NVIDIA settings

Brightness 0%
Contrast 0%
Gamma 0.50%
Digital vibrance 15%

Apply

Use power button to Shutdown
Use power button to Start

Screen contrast changes from high contrast to lower contrast then high contrast.

Would someone in ASUS support please respond as soon as possible as to why this is happening ?


Larkstarr, would you please follow the sequence of events I have outlined above and see if you can reproduce the issue ?
Also which ASUS model and NVIDIA graphics card are you using ?

Thanks.

Light
Level 7
Thank you for your response cl-Albert. The settings I have shown are those set by me.

Once the above steps I have described are followed the issue occurs every time. To get rid of the high contrast issue I have to press the "Restore Defaults" in Open the "NVIDIA Control Panel -> Display -> Adjust desktop colour settings, after that I can set Brightness, Contrast, Gamma to anything and the display colours function as expected. However, when I'm working in reduced light or lights out and I need to adjust the Brightness, Contrast, Gamma to lower settings as I have provided in my previous post, then when I Shutdown and then Start the display is overexposed as described above.

I have already done all the things you mentioned, reinstall etc. latest drivers, remove Power4 Gear, disable adaptive brightness, etc. none of them make any difference. I have spent many hours on this issue and it is really simple to reproduce following the instructions I have already posted.

Someone at ASUS simply needs to follow the instructions I have provided to reproduce the issue. I am using a G750JW fitted with the standard GTX 765M.

Anyone still having this issue? I've been tracking it down and I found a solution that works for me and has not been covered in this thread.

The issue is the power setting for "Adaptive backlight" (*different than "Adaptive brightness"*) which is handled by the NVIDIA driver. For some reason, the GUI to configure this option doesn't always show up in the Windows Power Options. You can do it in the registry.

First, if you are having the issue, try changing your power profile to "High performance" and see if it goes away. The default settings are that you will see this issue always if you are on the "Power saver" profile, on battery only if you are on the "Balanced" profile, and you shouldn't see it at all on the "High performance" profile.

If you want to use the "Balanced" or "Power saver" profile (or a custom profile), you need to make a registry change to get this issue to go away.

Four steps.

1. Search the registry for "aded5e82-b909-4619-9949-f5d71dac0bcc". If you see a key with this name under HKLM\SYSTEM\CurrentControlSet\Control\Power\User\PowerSchemes, see if you have values for "ACSettingIndex" and "DCSettingIndex" under this key. If you do, set them to 0 if they are not already set.

2. Navigate in regedit to "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Power\PowerSettings". Go through each of the keys here and see if you have a subkey named "aded5e82-b909-4619-9949-f5d71dac0bcc". If you find it, drill down to "DefaultPowerSchemeValues", and under each key there, set the "ACSettingIndex" and "DCSettingIndex" to 0.

This registry snippet will set the appropriate values for the default "High performance", "Balanced", and "Power saver" plans, and may help you find the appropriate values to change if you are having trouble following my previous statements. 🙂

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Power\PowerSettings\7516b95f-f776-4464-8c53-06167f40cc99\aded5e82-b909-4619-9949-f5d71dac0bcc\DefaultPowerSchemeValues]

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Power\PowerSettings\7516b95f-f776-4464-8c53-06167f40cc99\aded5e82-b909-4619-9949-f5d71dac0bcc\DefaultPowerSchemeValues\381b4222-f694-41f0-9685-ff5bb260df2e]
"DCSettingIndex"=dword:00000000
"ACSettingIndex"=dword:00000000

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Power\PowerSettings\7516b95f-f776-4464-8c53-06167f40cc99\aded5e82-b909-4619-9949-f5d71dac0bcc\DefaultPowerSchemeValues\8c5e7fda-e8bf-4a96-9a85-a6e23a8c635c]
"DCSettingIndex"=dword:00000000
"ACSettingIndex"=dword:00000000

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Power\PowerSettings\7516b95f-f776-4464-8c53-06167f40cc99\aded5e82-b909-4619-9949-f5d71dac0bcc\DefaultPowerSchemeValues\a1841308-3541-4fab-bc81-f71556f20b4a]
"DCSettingIndex"=dword:00000000
"ACSettingIndex"=dword:00000000


[Edit] Not sure if my quote worked, it looks like the board added some extra spaces in the word "Control". You should probably track this down manually.

3. Reboot, I guess, to make sure the changes take effect.

4. Profit!

Aaron44126 wrote:
Anyone still having this issue? I've been tracking it down and I found a solution that works for me and has not been covered in this thread.

The issue is the power setting for "Adaptive backlight" (*different than "Adaptive brightness"*) which is handled by the NVIDIA driver. For some reason, the GUI to configure this option doesn't always show up in the Windows Power Options. You can do it in the registry.

First, if you are having the issue, try changing your power profile to "High performance" and see if it goes away. The default settings are that you will see this issue always if you are on the "Power saver" profile, on battery only if you are on the "Balanced" profile, and you shouldn't see it at all on the "High performance" profile.

If you want to use the "Balanced" or "Power saver" profile (or a custom profile), you need to make a registry change to get this issue to go away.

Four steps.

1. Search the registry for "aded5e82-b909-4619-9949-f5d71dac0bcc". If you see a key with this name under HKLM\SYSTEM\CurrentControlSet\Control\Power\User\PowerSchemes, see if you have values for "ACSettingIndex" and "DCSettingIndex" under this key. If you do, set them to 0 if they are not already set.

2. Navigate in regedit to "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Power\PowerSettings". Go through each of the keys here and see if you have a subkey named "aded5e82-b909-4619-9949-f5d71dac0bcc". If you find it, drill down to "DefaultPowerSchemeValues", and under each key there, set the "ACSettingIndex" and "DCSettingIndex" to 0.

This registry snippet will set the appropriate values for the default "High performance", "Balanced", and "Power saver" plans, and may help you find the appropriate values to change if you are having trouble following my previous statements. 🙂



[Edit] Not sure if my quote worked, it looks like the board added some extra spaces in the word "Control". You should probably track this down manually.

3. Reboot, I guess, to make sure the changes take effect.

4. Profit!



WOW, I followed these steps and it worked .. for the most part! I seem to be getting some slight contrast changes still, but it's not NEARLY as bad or noticeable as it was previously, and it could just be my eyes .. hard to break a bad habit.

I registered for the forums just to say thank you, Aaron! You've saved my sanity.

Larkstarr wrote:
WOW, I followed these steps and it worked .. for the most part! I seem to be getting some slight contrast changes still, but it's not NEARLY as bad or noticeable as it was previously, and it could just be my eyes .. hard to break a bad habit.

I registered for the forums just to say thank you, Aaron! You've saved my sanity.


Glad it helped someone.

I still have another machine with this issue that my registry fix above did not help. As others have noted, for some reason the same solution doesn't work for everyone and not everyone has been able to find a solution.

The machine in question is not an ASUS machine, but a Dell Precision M6700 with NVIDIA Quadro K5000M. (Really obnoxious to have this issue in such a high-end machine.)

The common thread seems to be machines with NVIDIA GPUs and no graphics switching. In my case it only affects the laptop internal display, not connected external displays. Also, at least in my case, reverting to a driver older than 325.xx fixes the problem (though this won't be possible with newer GPUs), so this is definitely some sort of software/driver issue and not hardware, and it's not specific to ASUS; it's something to do with the NVIDIA drivers and Windows itself.

325.xx is when they moved up to WDDM 1.3 for Windows 8.1. Sort of hoping it just works itself out when they switch to WDDM 2.0 / Windows 10 drivers (looks like this is happening with 350.xx).

Still looking for another solution to fix my Precision. Hopefully someone else comes up with something yet. 🙂

Aaron44126 wrote:
Anyone still having this issue? I've been tracking it down and I found a solution that works for me and has not been covered in this thread.

The issue is the power setting for "Adaptive backlight" (*different than "Adaptive brightness"*) which is handled by the NVIDIA driver. For some reason, the GUI to configure this option doesn't always show up in the Windows Power Options. You can do it in the registry.

First, if you are having the issue, try changing your power profile to "High performance" and see if it goes away. The default settings are that you will see this issue always if you are on the "Power saver" profile, on battery only if you are on the "Balanced" profile, and you shouldn't see it at all on the "High performance" profile.

If you want to use the "Balanced" or "Power saver" profile (or a custom profile), you need to make a registry change to get this issue to go away.

Four steps.

1. Search the registry for "aded5e82-b909-4619-9949-f5d71dac0bcc". If you see a key with this name under HKLM\SYSTEM\CurrentControlSet\Control\Power\User\PowerSchemes, see if you have values for "ACSettingIndex" and "DCSettingIndex" under this key. If you do, set them to 0 if they are not already set.

2. Navigate in regedit to "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Power\PowerSettings". Go through each of the keys here and see if you have a subkey named "aded5e82-b909-4619-9949-f5d71dac0bcc". If you find it, drill down to "DefaultPowerSchemeValues", and under each key there, set the "ACSettingIndex" and "DCSettingIndex" to 0.

This registry snippet will set the appropriate values for the default "High performance", "Balanced", and "Power saver" plans, and may help you find the appropriate values to change if you are having trouble following my previous statements. 🙂



[Edit] Not sure if my quote worked, it looks like the board added some extra spaces in the word "Control". You should probably track this down manually.

3. Reboot, I guess, to make sure the changes take effect.

4. Profit!


Wow, thank you for discovering this fix.

I had just about given up on this problem for the past couple of years. And today when I accidentally hibernated my laptop again, I thought maybe there was a real solution out by now. After rebooting, I hibernated the laptop again and confirmed that it works.

Here are the things that I tried that DID NOT WORK or at least seemed to work until the next hibernate.

- Disabling Sensor Montoring Service.
- Disabling NVIDIA Stereoscopic 3D Driver Service and NVIDIA Streamer Service.
- Changing Enable adaptive brightness to off on all 3 power plans.
- Adjust video color settings in the NVIDIA control panel and disable Dynamic contrast enhancement and color enhancement.

I can't believe the problem was a hidden setting that could only be found by searching regedit. Quite ridiculous if you ask me.

Light
Level 7
Aaron, I followed all your steps and they didn't make any difference. As soon as a restart is done the auto contrast comes back.