LWJGL 2 is unmaintained and new builds are needed

[Amjad50]

System Information

MultiMC version: 0.6.5-custom

Operating System: Antergos Linux x86_64

Kernel: 5.1.4-arch1-1-ARCH

Summary of the issue or suggestion:

When opening a modded minecraft (maybe forge is the issue) the game crashes in OneSix launcher.
Tried with PO3 and Enigmatica2 Expert.
Maybe as other similar issues suggest. it is because of forge.
In here I'm using java openjdk 8.
I think this problem happened after I made nvidia my primary graphics driver.

What should happen:

The game should start normally, as if there is no forge.

Steps to reproduce the issue (Add more if needed):

1. launch the game

Suspected cause:

Nvidia and openGL problems with forge

Logs/Screenshots:

This is the log of the run:
https://paste.ee/p/Y89Gn

Additional Info:

[Janrupf]

For some reason you are running Minecraft on the Internal GPU. Du you have the required drivers installed?

[Amjad50]

Yes, I recently I installed nvidia drivers.
Then, I encountered an issue with low resolution screen, so I looked for a solution and found this.
xrandr --newmode "1920x1080_60.00" 173.00 1920 2048 2248 2576 1080 1083 1088 1120 -hsync +vsync
xrandr --addmode eDP-1-1 "1920x1080_60.00"
xrandr --output eDP-1-1 --mode "1920x1080_60.00"

putting this in .xprofile, to run on start fixed the issue.

[Amjad50]

I found something.
If I changed the display to 960x540, from Arandr(xrandr). which result in low res, then started minecraft it works.
Then, I can get back to 1080 and it still works.

This resolves the issue.
Thank you.

But can you tell me why it works?

[QuImUfu]

Somehow LWJGL is not able to get your current primary resolution (it gets an empty list and then tries to access the first value). That also explains why you solution works. Whatever bugs on your default resolution and causes that crash does not happen on the other resolution.
You could try what happens if you disable full screen. Maybe it does not try to get that information then.
This is likely a bug in Nvidias driver or maybe LWJGL.
It seems to be an issue someone else had on vanilla minecraft as well (https://bugs.mojang.com/browse/MC-123286) You could try to provide the missing data on that bug report, but you should do so with a pure vanilla setup (launcher and game).

[Amjad50]

You could try what happens if you disable full screen.

What do you mean by disabling full screen?
Minecraft is default to fullscreen off.

I found something, in version 1.14.1 the game starts normally, version 1.12 have problems even without mods or forge.

[QuImUfu]

The newer versions of minecraft (1.13+) use a wildly different version of LWJGL that does not have this issue.

The old version does a dirty hack that does (for some reason) not work on your system.
Could you post the output of xrandr -q
and the log of the game launched with -Dorg.lwjgl.util.Debug=true as java argument.

[Amjad50]

This is the output of xrandr -q

eDP-1-1 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 344mm x 194mm
   960x540       59.82  
   864x486       59.92    59.57  
   640x480       59.94  
   480x270       59.82  
   432x243       59.92    59.57  
   320x240       60.05  
   1920x1080_60.00  59.96* 
DP-1-1 disconnected (normal left inverted right x axis y axis)
HDMI-1-1 disconnected (normal left inverted right x axis y axis)
HDMI-1-2 disconnected (normal left inverted right x axis y axis)
  1920x1080_60.00 (0x210) 173.000MHz -HSync +VSync
        h: width  1920 start 2048 end 2248 total 2576 skew    0 clock  67.16KHz
        v: height 1080 start 1083 end 1088 total 1120           clock  59.96Hz

This is the log with the debug flag
https://paste.ee/p/nxxoV

[Amjad50]

I have fixed the issue.
The issue is from LWJGL side.
in org.lwjgl.opengl.XRandR.java it performs xrandr -q and does some regex with the entries to find the screen.
It uses

private static final Pattern SCREEN_MODELINE_PATTERN = Pattern.compile("^(\\d+)x(\\d+)$");
...
...
Matcher m = SCREEN_MODELINE_PATTERN.matcher(sa[0]); 
// where sa[0] will be the first split of the line
// 1920x1080_60.00  59.96*
// which is 1920x1080_60.00

to find the mode's width and height.

I got the mode I'm using now from Arch wiki by using cvt 1920 1080 and I got

Modeline "1920x1080_60.00"  173.00  1920 2048 2248 2576  1080 1083 1088 1120 -hsync +vsync

The above mode does not match the regex, thus it was not discovered by XRandR.java::populate()

The solution is just to edit SCREEN_MODELINE_PATTERN to something like "^(\\d+)x(\\d+).*$"

I tried to edit lwjgl-2.9.4-nightly-20150209.jar that MultiMC uses and it worked. (Even though it require change of hashes in the modpack settings, and only works in offline because I think on each run MultiMC will try to update LWJGL library and it finds the version on the net is different from the version currently using).

[Janrupf]

That sounds bad. The LWJGL version is probably not maintained anymore and implementing a fix in MultiMC would be a horrible hack...

[peterix]

Cool. LWJGL 2 is basically unmaintained at this point, so it may be necessary to fork it and fix it.

[Amjad50]

Minecraft uses a nightly built 2.9.4.xxxxxx, I don't know who is contributing to it because legacy LWJGL lastest version is 2.9.3

If we made a repo for LWJGL I think it's best if we can get the code of the nightly build.