3.5.1 (Metal GPU Backend) Cycles Viewport intensely flashes on AMD FirePro D500 macOS Monterey #106925

New Issue

System Information
Operating system: macOS Monterey 12.6.4 (21G526)
Graphics card: AMD FirePro D500 3 GB

Mac Pro (Late 2013)
2,7 GHz 12-Core Intel Xeon E5
64 GB 1866 MHz DDR3
AMD FirePro D500 3 GB

Blender Version
Broken: 3.5.1, 268d826a76, blender-v3.5-release, 04-14-2023
Worked: 3.5.1, 1bd46a46d1, blender-v3.5-release, 04-13-2023

Short description of error

Metal GPU Backend
Cycles Render Engine
Viewport Shading: Rendered

Intense flickering (strobo-like effect) of the whole viewport when you move or orbit viewport around the cube.

Exact steps for others to reproduce the error
Open Blender.
Edit, Preferences, System, select GPU Backend: Metal, Save Preferences, Close Blender.
Relaunch Blender.
Default cube scene, select Cycles render engine, change Viewport Shading to Rendered.
You get intense flickering (strobo-like effect) of the whole viewport when you move or orbit viewport around the cube.

Please look at the .mov (https://projects.blender.org/attachments/6a7ccbc1-aec6-4094-910f-650a9a95771f).

The actual strobo effect is much more intense than it looks, because the screen capture is only 25FPS.

**System Information** Operating system: macOS Monterey 12.6.4 (21G526) Graphics card: AMD FirePro D500 3 GB Mac Pro (Late 2013) 2,7 GHz 12-Core Intel Xeon E5 64 GB 1866 MHz DDR3 AMD FirePro D500 3 GB **Blender Version** Broken: 3.5.1, 268d826a7601, blender-v3.5-release, 04-14-2023 Worked: 3.5.1, 1bd46a46d15a, blender-v3.5-release, 04-13-2023 **Short description of error** Metal GPU Backend Cycles Render Engine Viewport Shading: Rendered Intense flickering (strobo-like effect) of the whole viewport when you move or orbit viewport around the cube. **Exact steps for others to reproduce the error** Open Blender. Edit, Preferences, System, select GPU Backend: Metal, Save Preferences, Close Blender. Relaunch Blender. Default cube scene, select Cycles render engine, change Viewport Shading to Rendered. You get intense flickering (strobo-like effect) of the whole viewport when you move or orbit viewport around the cube. Please look at the .mov (https://projects.blender.org/attachments/6a7ccbc1-aec6-4094-910f-650a9a95771f). The actual strobo effect is much more intense than it looks, because the screen capture is only 25FPS.

Can't reproduce with
Operating system: macOS-13.2.1-x86_64-i386-64bit 64 Bits
Graphics card: Metal API AMD Radeon Pro 5700 XT 1.2

Can't reproduce with Operating system: macOS-13.2.1-x86_64-i386-64bit 64 Bits Graphics card: Metal API AMD Radeon Pro 5700 XT 1.2

Can't reproduce with
Operating system: macOS-13.2.1-x86_64-i386-64bit 64 Bits
Graphics card: Metal API AMD Radeon Pro 5700 XT 1.2

@iss I hope this fixes it for me as a colateral effect 🤞

#106914

> Can't reproduce with > Operating system: macOS-13.2.1-x86_64-i386-64bit 64 Bits > Graphics card: Metal API AMD Radeon Pro 5700 XT 1.2 @iss I hope this fixes it for me as a colateral effect 🤞 https://projects.blender.org/blender/blender/pulls/106914

I see that is in main branch. Please check daily build and let us know.

I see that is in main branch. Please check daily build and let us know.

@iss it seems that actually fixed it. No more blinking on 3.6.0 e078419c9c main 04-15-2023

Issue persist on latest 3.5.1 blender-v3.5-release daily build though.

> I see that is in main branch. Please check daily build and let us know. @iss it seems that actually fixed it. **No more blinking on 3.6.0 e078419c9c12 main 04-15-2023** Issue persist on latest 3.5.1 blender-v3.5-release daily build though.

I believe not all candidate fixes have been ported back into the 3.5.1 branch just yet, though glad to hear confirmation that the issue does not appear to occur in 3.6.0.

Can post back here once the patch has landed in 3.5.1.

I believe not all candidate fixes have been ported back into the 3.5.1 branch just yet, though glad to hear confirmation that the issue does not appear to occur in 3.6.0. Can post back here once the patch has landed in 3.5.1.

I believe not all candidate fixes have been ported back into the 3.5.1 branch just yet, though glad to hear confirmation that the issue does not appear to occur in 3.6.0.

Can post back here once the patch has landed in 3.5.1.

Reporting back:

@Michael-Parkin-White-Apple it seems the patch has landed on 3.5.1 93dac7da2c daily build, no more flickering here (on my machine at least).

> I believe not all candidate fixes have been ported back into the 3.5.1 branch just yet, though glad to hear confirmation that the issue does not appear to occur in 3.6.0. > > Can post back here once the patch has landed in 3.5.1. Reporting back: @Michael-Parkin-White-Apple it seems the patch has landed on 3.5.1 93dac7da2c6a daily build, no more flickering here (on my machine at least).

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3.5.1 (Metal GPU Backend) Cycles Viewport intensely flashes on AMD FirePro D500 macOS Monterey #106925