Lumia 920s suffering from brightness bug with Portico update? Here's a possible fix.
Although the majority of people who are on AT&T or Rogers who have upgraded their Lumia 920 to Windows Phone “Portico” are having no problems (in fact, quite the opposite), there is one bug that seems to affect a few people: auto-screen brightness.
As detailed in our Lumia 920 forums, the problem exhibits itself when you turn on the phone in a mildly lit room and the brightness seems to ramp up to max and then back down again, resulting in a staggered and constantly fluctuating display brightness.
As forum member iamtim wrote:
Many people have chimed in saying they are seeing the same behavior as well. For some, disabling “auto brightness” helped while for others this results in eve “low” being too bright:
Personally, we have not seen this on our four Lumia 920s here at Windows Phone Central—that’s not to say it doesn’t exist, just that this isn’t a universal problem that one will automatically get if they update. In that sense, it's more a quirky side effect than a reproducible bug.
The issue appears to be one of calibration of the ambient light sensor—that is when the update occurred, the device may have calibrated in bright light (or perhaps it really just “screwed up”). That little sensor (found near the earpiece) is misjudging the light in the room and it’s causing wonky behavior, to say the least.
The good news is there may be a fix, which is seemingly simple:
- Take your phone into a pitch-black room
- Power on
- Slide your lock screen up
Seriously, some people are reporting that is all it needs, which in a way makes sense. The phone needs to get a baseline reading of light including very low/no light. Without a bottom to go from, the phone can get muddled on the range it should use. Letting the phone be exposed to pitch black for a few moments may be enough to re-calibrate the system.
Now since none of our phones are exhibiting this phenomenon, we can’t verify if the above actually works (though it has been a go to in the past). For that, we turn to you folks to see if this accomplishes the task and alleviates the oddity. If so, sound off in comments and don’t forget to share your bugs and any issues in our support forum.
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Daniel Rubino is the Editor-in-chief of Windows Central, head reviewer, podcast co-host, and analyst. He has been covering Microsoft since 2007 when this site was called WMExperts (and later Windows Phone Central). His interests include Windows, laptops, next-gen computing, and for some reason, watches. Before all this tech stuff, he worked on a Ph.D. in linguistics, watched people sleep (for medical purposes!), and ran the projectors at movie theaters because it was fun.
With my L900, I probably reset once every few months or so. Prior to Portico, I had to reset my 920 once every day or two because of freezes. Luckily after Portico, no freezes (yet) but the light sensor issue is annoying.
I have all settings off that dims the brightness or battery saver.. anything like that.
Just tried this weird fix and it didnt work
I just did the restart-in-pitch-black-room-and-slide-up-lock-screen thing (yay for server rooms). I'll report back if the problem shows up again.
Daniel, if you are one thing, it is candid. All around 'Thanks' for that!
Kind of on topic, but as someone else in this thread mentioned, this might not be related to Portico, but rather the last display + touch update. They came out right around the same time.
Second, I will try it because it is annoying and the screen seems to get too dim in dark rooms. Hard to read.
Also, has anyone noticed the capacitive button not lighting up when this is happening? I had that problem last night.
The admins really should delete your post.
Sameless advertising is NOT the reason to be posting here in the forums.
I started the installation of the instructions and installed the same ... It says that it is in offline mode and it is necessary to disconnect from online, I think the computer ...
[XDA News] [How To] Download and flash all WP8 Nokia Lumia Stock ROM - xda-developers
After connecting, I did calibraciju everything I could, and we were offered ...
ALS calibration is required to have another similar device and both must be in test mode (I have L920 and L1020), both of which are in test mode and I did a calibration on the second L920.
I do not know if I should, I turned off the light in the room and did the calibration according to another device.
Nokia Care has requested that the devices are next to each other in order to give it more like reading ...
I do not know if I was able to do anything to improve ... I'll just see ... Sorry for my english (google translate... )