[MCPE-14083] Redstone components with <15 signal strength output have a strange effect on blocks indirectly powered by redstone wire that is powered by the component Created: 11/Apr/16  Updated: 04/Apr/18  Resolved: 04/Apr/18

Status: Resolved
Project: Minecraft (Bedrock codebase)
Component/s: None
Affects Version/s: 0.14.0, 0.14.1, 0.14.2, 0.15.0, 0.15.4, 0.15.7, 0.15.90.2, 0.15.90.7, 0.16.0, 0.16.1, 0.17.0.1, 0.16.2, 1.0.0.0, 1.0.0.1, 1.0.2, 1.0.3, 1.0.4.0, 1.0.4.1, 1.0.4.11, 1.0.5.13, 1.0.6.0, 1.0.5.54, 1.1.0.0, 1.0.7.0, 1.1.0.8, 1.1.0.9, 1.1.0.55, 1.1.1.0, 1.1.2.50, 1.1.3.1, 1.2.0.18, 1.2.6.2, 1.2.5.52, 1.2.8.0, 1.2.9.1, 1.2.10.1, 1.2.10.2
Fix Version/s: 1.2.13.54

Type: Bug
Reporter: Azelef
Resolution: Fixed Votes: 5
Labels: redstone, redstone_comparator, redstone_wire

Attachments: JPEG File MegaSpud 195.JPG     JPEG File MegaSpud 196.JPG     PNG File Minecraft 1_17_2018 10_16_40 AM.png     PNG File Screenshot_2016-04-11-10-36-49.png     PNG File With redstone dust.png     PNG File Without redstone dust.png     GIF File comparator.gif     GIF File trappedChest.gif    
Issue Links:
Duplicate
is duplicated by MCPE-22667 Strange behavior of redstone mechanis... Resolved
Relates
relates to MCPE-14204 Redstone power level can incorrectly ... Resolved
Confirmation Status: Confirmed
Platform: Android
CHK:
ADO: 55519

 Description   

Redstone wire powered via redstone comparators (or any block that can provide an output of <15 signal strength, such as weighted pressure plates or trapped chests) that are themselves powered with a signal strength <15 have an odd effect where blocks that should be powered via a strongly powered block under the redstone wire with a signal strength of 1 are not powered if redstone wire is placed on top of them (the redstone wire on top of them has a signal strength of 0, so it looks like the blocks think they should be unpowered, and ignore the strongly-powered block adjacent to them).

Steps to reproduce

  1. Construct the build shown in the screenshot "Without redstone dust.png". Notice how the redstone lamps at the end are powered, as they should be.
  2. Place redstone wire on top of the last lamps. Notice how, like in "With redstone dust.png", the redstone lamp turns off, because it thinks it should be unpowered. This happens only in the case where the comparator output level is <15; when its output level is 15, the lamp remains on.


Original description

In the attachment, you can see that even though all redstone lines have the same signal strength, only the one that isn't powered by a comparator turns on the lamp on its right. If you remove the unpowered redstone on top of those lamps, they all become lit.



 Comments   
Comment by [MCPE Mod] Auldrick [ 04/Apr/18 ]

I just retested every example shown in these screenshots under 1.2.13. All of them work correctly now, but I don't see any fix in the changelogs for 1.2.9, 1.2.10, or 1.2.11 that could explain it.

Comment by [MCPE Mod] Auldrick [ 16/Jan/18 ]

Can no longer reproduce this issue with comparators in Windows 10 1.2.9.1. However, the issue with a trapped chest continues to happen.

It turns out the issue still happens with comparators, too, with the right length of redstone wire and power level into the comparator.

Comment by [MCPE Mod] Auldrick [ 22/Dec/17 ]

MCPE-22667 was closed as a duplicate of this issue. However, 22667 describes an additional fact that I don't believe is described in this ticket: This screenshot shows two versions of a circuit. In both of them, the redstone dust on the green block is at power level 1, but in one of them the redstone lamp is on and in the other it's off. The only difference is that in the one where the lamp is on the comparator is outputting power level 15, whereas in the other one the power level out of the comparator is at level 14. So placing redstone dust on the lamp only turns the lamp off if the dust is being powered by a comparator whose output level is less than 15.

Comment by [Mojang] Mega_Spud (Jay Wells) [ 21/Aug/17 ]

Confirmed for 1.2.0.18.

This behaviour also seems to affect trapped chests; the redstone output is inconsistent when placed over redstone lamps:

Comment by Zeb [ 10/Oct/16 ]

Affects 0.15.90.8 (0.16.0 beta build 5).

Comment by Zeb [ 06/Oct/16 ]

Affects 0.15.10. (Tested on Windows 10.)

Comment by Zeb [ 16/Sep/16 ]

Affects 0.16.0 beta build 4 AKA 0.15.90.7.

Comment by Zeb [ 03/Sep/16 ]

Confirmed for 0.15.90.2. Using an Acer B1-750 tablet. (Intel HD Graphics for BayTrail, Android 4.4.4.)

Comment by Zeb [ 03/Sep/16 ]

Confirmed for 0.15.7. (Tested on Windows 10.)

Comment by Zeb [ 08/Aug/16 ]

Confirmed for 0.15.4. (Tested on Windows 10.)

Comment by AMAN4700 [ 08/Aug/16 ]

Please respond and add the current version if you can reproduce this issue.

Comment by Zeb [ 19/Jun/16 ]

Confirmed in 0.15.0. (Tested in Windows 10.) Very strange indeed...

EDIT: I think this behavior may be related to MCPE-14204.

Comment by PHO [ 11/Apr/16 ]

Confirmed in 0.14.1. Very strange...

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