[G2 General] Compass Linux:
Hi there.

Following @Tijmen's advice, this thread is for those who have damaged screens (specifically the black lines). There are reports that a

reboot

triggers this issue. @autoprime had his G2 (never flashed recovery, kernel or ROM) get the black lines after rebooting into Stock Recovery when he was only using ADB with the phone hot.

My device:

Model: LG G2 D805

Current ROM: CloudyStock 2.3 (flashed after the screen panel replacement through RMA)

Panel: $ su -c 'cat /proc/cmdline' -> mdss_dsi_g2_lgd_cmd -> LGD Panel

Damage: Permanent Vertical Black Lines on the right side (borrowed screenshot; even in recovery)

External Links: Reddit 01, Reddit 02

From #lg-g2@irc.freenode.net (irrelevant lines have been removed):

IMPORTANT - MUST READ IRC TEXT BELOW IN RED!:

How I saw it happen:

After twrp flashed the files mentioned above, the phone rebooted to a black screen with a vertical non uniform white band in the middle, which rapidly expanded sideways until the screen suddenly went entirely black (that's the moment the screen was damaged), vibrated and turned off. When turned on, permanent vertical black lines on the right side of the screen in recovery, in ParanoidAndroid etc. Flashed a stock D805 ROM, problem persists.

What has been confirmed about the origin(s) of this issue:

@dr87 was kind to clarify this issue here, here, here and here.

@houstonn has some information here and here.

This issue in numbers of LG G2's affected is very low. What is increasing until now are the number of different ROMs affected.

*** Unconfirmed Information (updated 28/07/2014) ***:

It was previously thought that Custom ROMs/Kernel were the cause of this problem, and that Stock ROMs/Kernels were safe to use. This is no longer the case due to @autoprime's experience. I removed the safe and unsafe ROMs list because of this and the Black Lines Survey. The possible reason (and I'm speculating here) Custom ROMs are more prone to this is that modifications done to them or their Kernels accentuated the problem that the phone already has but haven't yet appeared (not all devices due to the still small number of complaints). With the information we have now, it indicates that a hardware failure related to heat is to blame, and using a Custom ROM/Kernel can make the failure appear more quickly than if you keep completely at Stock. In @autoprime's case the simple use of ADB then reboot into Stock Recovery with the phone hot triggered the black lines. And since people are asking what is safe to flash and whatnot, there is unfortunately no answer as of yet.

My device is back from RMA (Return Merchandise Authorization). The panel has been replaced, and after flashing (recovery and ROM) no black lines.

@dr87 has a very interesting post here. He has also built a custom twrp with thermal control. If you use this and it corrupts your /cache partition, do this.

@chillstep1998 has a post about an app that can somehow remove (in his case all of them) the black lines. I'm not sure how it works but if you do chose to use it (if you have no warranty for example), remember that your results will likely vary from others experience.

Which Panel do I have? LGD or JDI?:

Here. Thanks go to @autoprime.

When was my G2 manufactured?:

Here. Thanks go to @jdk2. Once you input the URL, check the generated page source code (you might not have to do it; I did) and read this.

Here is another (and better) way to check the same information. Thanks go to @razrzxcvbnm.

I'll leave both methods just in case one or the other "disappears".

Hints:

@RusherDude has an interesting theory. If the conditions he mentions match yours, please confirm and elaborate the best you can in the thread. Thanks!

In the meantime (considering no permanent way to avoid the black lines):

You're crazy about Custom ROMs as I am and still have some months warranty for your device. I had my screen panel replaced under warranty and it's working fine for now. If I get the black lines again I can take it for repair, as long as I'm under warranty. Once my warranty expires, I'm on my own;

You're crazy about Custom ROMs as I am and no warranty for your device. You fall into two situations basically. Repair the screen now for around USD$80 (parts only), or live with this situation and flash to your hearts content. Repairing the screen hopefully fixes the problem permanently.

Black Lines Survey:

User @NicoC72 created a Black Lines Survey, Graph and Spreadsheet. Thanks!

Contact:

You can find me and lots of nice people in the #lg-g2 IRC Channel at irc.freenode.net (go to Freenode for instructions on how to connect)

To see if I'm away, use /whois Compass_Linux.

Compass.