Nexus 7画面はちらつきです -- screen フィールド と nexus-7 フィールド android 関連 問題

My 16 GB Nexus 7 arrived a few days ago. It's my first mobile device, believe it or not, and I've already found it to be incredibly useful. It has performed flawlessly, but there is one small issue that's an annoyance, nothing more. The screen flickers.

It happens in dimmer light, and only for a second or two at a time. I suspect, though I can't prove this, that it occurs during WiFi transmissions. Has anyone else encountered this? Is there a fix for this, even if it has to be some sort of warranty thing?

There just was a Blog on Land of Droid covering this issue. The author summed up a few conditions under which this "flicker" occurs:

• back-light is dimmed under 30%
• a weak WiFi signal
• the device is accessing the net

According to that report, these 3 things are "AND-connected" (i.e. the flicker occurs when all of the 3 conditions are met). He's also hoping for a fix to come soon.

You might as well want to read the comments there, some seem to indicate possible solutions (including flashing a new stock ROM), but so far none of them are yet confirmed.

Sounds like this is one of two things to me.

Either a faulty screen / hardware. OR depending on the severity of this flicker it may be that the device has a light sensor that is trying to change the screen brightness based on the ambient light surrounding the device.

You could rule out the second option by going to your screen brightness in the settings and make sure that it is set to a static amount and that "Automatic brightness" is turned off. If after you do this you still notice the flickers I would lean more towards faulty hardware.

I have seen on some devices (don't have Nexus 7 so never on that) that the automatic brightness feature will sometimes cause the brightness of the screen to flicker somewhat wildly from all the way low to all the way high within a few seconds.

Turning off auto brightness worked for me.

As a recent (Christmas time) buyer with a new device, I can acknowledge this issue with Android 4.2. As per the bug report and the user tests here (under brightness heading), it looks to be a hardware problem rather than software.

1. New devices even after warranty and replacement have shown the same issue (4 out of 4 replacements)
2. Disabling wifi optimization/keeping brightness above 30% is seen to fix it only temporarily which is disappointing.
3. As per report update, 4.2 made it worse which could also mean that a software patch can fix this for good in future. But on the other side, there are users who never faced this issue with a fresh buy and 4.2 update.
4. New nexus 7 users may be better off with 4.1 until there is a fix.