Known Participant

P: "Lights Out" (L key) UI overlay misaligned at 125% Scaling

Forum|Forum|30 days ago
March 23, 2026
3 replies
180 views

1. Platform and Version

Lightroom Classic version: 15.2.1
OS: Windows 11 Pro

2. System Environment (Multi-monitor & Scaling)

Display Setup: 4 monitors (Mainly using two 2560x1440 and one 1920x1080).
Windows Scaling: All monitors set to 125% scaling.
GPU: NVIDIA GeForce RTX 4070 Ti [cite: 2026-02-02].

3. Steps to reproduce

Open Lightroom Classic on a multi-monitor system with Windows Scaling set to 125%.
Enable the Secondary Display (F11) in Full Screen mode on any additional monitor.
In either the Library or Develop module, cycle through the "Lights Out" modes by pressing the 'L' key (Lights On > Dim > Lights Off).

4. Expected result The UI should dim (Lights Dim) or turn black (Lights Off) on all monitors, while keeping the image/grid area fully visible and unaffected by the dimming layer.

5. Actual result The dimming behavior is erratic and inconsistent:

Total Blackout: Frequently, the photo area itself is dimmed or completely blacked out on either the main or secondary monitor.
Coordinate Misalignment: A "shadow rectangle" often appears on the secondary monitor, partially covering the images from the left side as if the mask coordinates are offset.
Partial visibility: Even when the image is incorrectly dimmed, the thin white border characteristic of "Lights Dim" mode (in Grid/Loupe views) remains visible around the area where the photo should be. This suggests that Lightroom correctly identifies the image coordinates, but the "dimming overlay" is being rendered with an incorrect offset or scale.

6. Additional Notes I have confirmed that this issue disappears entirely when Windows Scaling is set to 100%. The bug seems to be a coordinate calculation error for the "Lights Out" overlay when non-standard scaling (125%) is used in a multi-monitor environment. Of course, there could be other triggers involved, but it looks like the scaling is the cause (and unfortunately, it is not the first time something is not working correctly in LrC when scaling is set to anything other than 100%). This has been going on for quite a while now, but I can’t really tell when this started happening exactly (what version number).

Thanks.

johnrellis

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Adapter #1: Vendor : 10de
Device : 2782
Adapter #2: Vendor : 10de
Device : 2782

The System Info indicates you’ve got two RTX 4070 Ti cards installed. To narrow down where the problem is (helping Adobe) and possibly identify a workaround while waiting for the issue to get fixed:

1. Disable one of the GPUs as described in step 6:

https://helpx.adobe.com/lightroom-classic/kb/troubleshoot-gpu.html#solution-4

2. Plug all four displays into the other card (getting HDMI-to-Display-Port cables if necessary). (The card allegedly supports up to 4 displays.)

3. If that fails, plug one and then two displays in at a time to see if it’s a particular display or number of displays that trigger the problem.

4. Repeat steps 1-3 for the other GPU.

Carlos_OliverasAuthor

Known Participant

Hello, John. To clarify, I only have one physical RTX 4070 Ti installed.

It’s true that a second adapter is reported with the same vendor (I hadn’t noticed). I’m not an expert in how these devices are reported or managed internally (both at the Windows level and within LrC), but I assume this duplicity could be related to how LrC handles GPUs? Or perhaps it has something to do with the USB Hubs in my Dell displays (which of course are connected to the 4070). All I can say for sure is that I only have the one physical card .

Furthermore, as demonstrated in my video, the exact same bug occurs on my laptop with a single external monitor (this laptop has some older nvidia card, can’t tell which one exactly right now), so it seems safe to me to assume that we can rule out multi-GPU conflicts or specific cable setups on my main workstation.

Or I could be wrong, of course, but at this point, I believe I’ve provided all the necessary data, steps to reproduce, and video evidence across different systems for Adobe to address this. I hope you understand that, as a user/customer, I feel like I’ve reached the limit of the technical troubleshooting I can perform in good faith.

By the way, I see the bug is already labeled as 'Acknowledged'—doesn’t that mean someone has already been able to reproduce it? At any rate, I will leave it in Adobe's hands and wait for a fix (assuming someone has been able to reproduce it, of course). And even so, given that there are other scaling issues that haven't been fixed in years, I’m not too optimistic, but I truly hope they fix this one.

Thanks for taking an interest in this issue and have a great day.

johnrellis

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In the old forum (superseded by a new platform a couple months ago), “Acknowledged” meant in practice that someone from the product team classified the problem as “not as originally designed” (Adobe’s definition of “bug”) and either that the problem report was reproducible or that the developers thought it likely that the problem really was a bug according to their definition, even though they couldn’t currently reproduce it (this typically happens when many people report very similar symptoms). When a bug report got “Acknowledged”, it also meant that it had been injected into the teams internal tracking system.

But with the new platform and newer people from Adobe Customer Support participating, I’m not sure that this is the current workflow and meaning of “Acknowledged”.

Carlos_OliverasAuthor

Known Participant

And finally, here’s a video just in case my previous explanations were not enough - it’s a little hard to screen record this kind of multidisplay issue, so I had to do it like this.

Please mind the computer shown here is not my main computer, but so far the same thing appears to happen on every computer as long as 125% is used on the displays.

Carlos_OliverasAuthor

Known Participant

One thing I forgot to emphasize: even at 125% scaling, the feature works correctly when using a single display (main interface only). It is the combination of enabling the secondary screen plus 125% scaling that triggers the problem on both displays (usually affecting one of them at a time, seemingly at random or depending on Loupe/Grid mode).

Note: I originally posted this as a bug, now someone reclassified it as a question. If so, please explain if you have tried to reproduce it, otherwise this is confusing. Thanks.

johnrellis

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Please do the LR menu command Help > System Info and copy/paste the entire contents here so we can see exactly which versions of hardware and software LR thinks you're running and important LR options that are set.

Carlos_OliverasAuthor

Known Participant

Lightroom Classic version: 15.2.1 [ 202603161217-0bf813d9 ]
License: Creative Cloud
Language setting: en
Operating system: Windows 11 - Business Edition
Version: 11.0.26200
Application architecture: x64
System architecture: x64
Logical processor count: 32
Processor speed: 2,9GHz
SqLite Version: 3.36.0
Adobe GSDK Version: 1.4.0.212

CPU Utilisation: 0,0%
Power Source: Plugged In
Built-in memory: 65252,8 MB
Dedicated GPU memory used by Lightroom: 130,4MB / 11994,0MB (1%)
Real memory available to Lightroom: 65252,8 MB
Real memory used by Lightroom: 1471,5 MB (2,2%)
Virtual memory used by Lightroom: 1489,9 MB
GDI objects count: 721
USER objects count: 2483
Process handles count: 3281
Memory cache size: 723,0MB
Internal Camera Raw version: 18.2.2 [ 2512 ]
Maximum thread count used by Camera Raw: 5
Camera Raw SIMD optimization: SSE2,AVX,AVX2
Camera Raw virtual memory: 126MB / 32626MB (0%)
Camera Raw real memory: 127MB / 65252MB (0%)

Cache1:
NT- RAM:0,0MB, VRAM:0,0MB, Combined:0,0MB

Cache2:
m:723,0MB, n:0,0MB

U-main: 83,0MB

System DPI setting: 120 DPI
Desktop composition enabled: Yes
Standard Preview Size: 2578 pixels
Displays: 1) 2560x1440, 2) 2560x1440, 3) 1920x1080, 4) 1024x600
Input types: Multitouch: No, Integrated touch: No, Integrated pen: Yes, External touch: No, External pen: Yes, Keyboard: No

Graphics Processor Info:
DirectX: NVIDIA GeForce RTX 4070 Ti (32.0.15.9579)
Init State: GPU for Export supported by default
User Preference: Auto
Enable HDR in Library: OFF
GPU for Preview Generation: Auto (S5_11)

Application folder: C:\Program Files\Adobe\Adobe Lightroom Classic
Library Path: C:\Users\carlo\Pictures\Lightroom\Lightroom Catalog v15.lrcat
Settings Folder: C:\Users\carlo\AppData\Roaming\Adobe\Lightroom

Installed Plugins:
1) Aperty
2) Flickr
3) Luminar Neo
4) Topaz Photo (Studio)

Config.lua flags:

Adapter #1: Vendor : 10de
   Device : 2782
   Subsystem : 40df1458
   Revision : a1
   Video Memory : 11994
Adapter #2: Vendor : 10de
   Device : 2782
   Subsystem : 40df1458
   Revision : a1
   Video Memory : 2eda
Adapter #3: Vendor : 1414
   Device : 8c
   Subsystem : 0
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   Video Memory : 0
AudioDeviceIOBlockSize: 1024
AudioDeviceName: System Default - Headphones (Elgato Wave:XLR)
AudioDeviceNumberOfChannels: 2
AudioDeviceSampleRate: 48000
Build: LR5x34
Direct2DEnabled: false
GL_ACCUM_ALPHA_BITS: 16
GL_ACCUM_BLUE_BITS: 16
GL_ACCUM_GREEN_BITS: 16
GL_ACCUM_RED_BITS: 16
GL_ALPHA_BITS: 0
GL_BLUE_BITS: 8
GL_DEPTH_BITS: 24
GL_GREEN_BITS: 8
GL_MAX_3D_TEXTURE_SIZE: 16384
GL_MAX_TEXTURE_SIZE: 32768
GL_MAX_TEXTURE_UNITS: 4
GL_MAX_VIEWPORT_DIMS: 32768,32768
GL_RED_BITS: 8
GL_RENDERER: NVIDIA GeForce RTX 4070 Ti/PCIe/SSE2
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