[myTouch 4G Q&A, Help & Troubleshooting] tonyMEGAphone:
***TL;DR***I know now that 4.3 has this bug and it is something we will deal with. I understand the causes, but the problem is buried in the kernel vs the ROM, you can still read my semi adventure but I wanted to make this edit to save you time if you think I found an answer. Overall WIFI is a huge trigger for screen wakes along with shotty or chattery reception.***

First off SlimBean is pretty much the best ROM I've dealt with, so many options, faster then I've ever experienced, and sharp looking. I've been sharking around these forums for 2 years afraid to ever make a name and post due to my lack of knowledge. I love the search options for finding answers that this forum offers to visitors and I've surely used it to root an old AT&T Atrix 4G and now my current DD the Glacier. Now I feel as though I have a little bit of sense of what the heck I am doing and would like to share my path to figuring out how to make SlimBean 4.3 work for me. Who knows maybe this may help some people that have similar problems.

The problem::: On a SEMI clean install of [UNOFFICIAL]SlimBean 4.3 \\ Nightly \\ 22.08.2013 I noticed the Glacier in standby would suddenly illuminated with light although the screen was black. It was enough to light to catch my eyes as I was starting to fall asleep. I ignored it until morning then paid attention to it happening all day at work on and off constantly with the WIFI off and just mobile network, then mobile network off, reboot, nothing seemed to help and I couldn't bare the thought of the phone's screen just on all the time.

After reading threads about HTC's possibly having bad screen made from Taiwan I was in disbelief that it was the Hardware as coming from a year old version of MIUI, I never had a problem with the screen. Leading to the idea it must be a software issue / user issue in which I must of rushed the install of the ROM or it's a quirk in 4.3.

Prior to reinstalling the same ROM, I went with trying other similar ROM's finding [UNOFFICIAL] Carbon 4.3 \\ Nightly \\ 26.08.2013 literally was just released, also a super customizable fast ROM. Everything went smooth until I played music through headphones and the illuminated black screen was back. Now I'm definitely convinced it's the software so I move on to the source code of these ROM's ev_glacier-nightly-2013.08.27.

Ev_glacier-nightly-2013.08.27 Had no screen wakes after 2 hours idle on mobile network only. I wasn't in a location with WIFI as I believe a network with a lot of information chatter may be causing these standby black illumination wakes. Back to SLIM.

SUPER clean install. 1) Format SD card completely 2) fresh download w/ checked md5 of Slimbean 3) Full Wipe "wipe data factory reset" "wipe cache" 4) format/system & format/cache manually just in case 5) Clear Dalvik 6) And fix permissions since although I believe it has no point but it's just so easy to click just in case. Probably doing things double.

Here I am now.. Slimbean is back and nothing but the .zip has been installed along with updating Nova Launcher. I am waiting to reinstall GAPPS so I can first isolate this problem within the ROM itself. What I am noticing is on just mobile network 2g/3g/2g+3g I do not get the phantom wakes, but with WIFI on it so far is only happening about 20-30 seconds after the phone drops into Standby and at least now it's not long lasting, just a few screen black flashes and it's gone. The entire 20 minutes or so I've been typing this, keeping an eye on the screen it's been quiet. Progress is being made.

Now I have thoroughly read up on and used Better Battery Stats, Wakelock detector, and Greenify to help isolate problems prior to the clean install and am waiting to install any Google apps (play store) up until tomorrow so I can pay more attention to my phone and make sure it's just a WIFI wake lock causing the screen to illuminate black. Also was toying with the idea of installing 3.0.64 kernel. I'm curious as to see if it's not just the WIFI wake lock, but all wake locks that actually wake the screen. Once I'm ready to install the play store I'm going to start combing through the device using these fantastic guides and the aforementioned apps...

[GUIDE] The Total Newb's Guide to Wakelocks ::: [HOW TO] Fix Your Skyrocket's Battery Life ::: [GUIDE] Insanely Better Battery Life When Idle

My goal with this long post is to share my experience and also commended these developers on these awesome ROM's. I will post much shorter updates on how I fixed or found the exact problem. Mainly after searching I saw similar issues but not this direct "random black illuminated screen" problem. Thanks, and be sure to call me out on anything contained in this post.