Effigys caused severe rendering artifacts

[letharion]

Your system information

Computer Information:
Manufacturer: MSI
Model: Z97M-G43(MS-7924)
Form Factor: Desktop
No Touch Input Detected
Processor Information:
CPU Vendor: GenuineIntel
CPU Brand: Intel(R) Core(TM) i5-5675C CPU @ 3.10GHz
CPU Family: 0x6
CPU Model: 0x47
CPU Stepping: 0x1
CPU Type: 0x0
Speed: 3600 MHz
4 logical processors
4 physical processors
Hyper-threading: Unsupported
FCMOV: Supported
SSE2: Supported
SSE3: Supported
SSSE3: Supported
SSE4a: Unsupported
SSE41: Supported
SSE42: Supported
AES: Supported
AVX: Supported
AVX2: Supported
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AVX512VNNI: Unsupported
SHA: Unsupported
CMPXCHG16B: Supported
LAHF/SAHF: Supported
PrefetchW: Unsupported
Operating System Version:
"Gentoo Linux" (64 bit)
Kernel Name: Linux
Kernel Version: 6.1.53-gentoo
X Server Vendor: The X.Org Foundation
X Server Release: 12101008
X Window Manager: KWin
Steam Runtime Version: steam-runtime_0.20230801.56012
Video Card:
Driver: NVIDIA Corporation NVIDIA GeForce GTX 770/PCIe/SSE2
Driver Version: 4.6.0 NVIDIA 470.199.02
OpenGL Version: 4.6
Desktop Color Depth: 24 bits per pixel
Monitor Refresh Rate: 59 Hz
VendorID: 0x10de
DeviceID: 0x1184
Revision Not Detected
Number of Monitors: 1
Number of Logical Video Cards: 1
Primary Display Resolution: 5120 x 1440
Desktop Resolution: 5120 x 1440
Primary Display Size: 0.04" x 0.04" (0.04" diag), 0.1cm x 0.1cm (0.1cm diag)
Primary Bus: PCI Express 16x
Primary VRAM: 2048 MB
Supported MSAA Modes: 2x 4x 8x 16x
Sound card:
Audio device: USB Mixer
Memory:
RAM: 15951 Mb
VR Hardware:
VR Headset: None detected
Miscellaneous:
UI Language: English
LANG: sv_SE.utf8
Total Hard Disk Space Available: 452873 MB
Largest Free Hard Disk Block: 36897 MB
Storage:
Number of SSDs: 4
SSD sizes: 3000G,3000G,512G,500G
Number of HDDs: 0
Number of removable drives: 0

• Have you checked for system updates?: [Yes, I'm up to date.]
• Are you using the latest stable video driver available for your system? [Yes, I'm using the latest available 470. 500> doesn't support my card.]
• Have you verified the game files?: [Yes, I have run integrity verification. (All 30547 files successfully validated)]

Please describe your issue in as much detail as possible:

When playing a game where there are effigies in the game, and they are on-screen, they cause severe rendering artifacts.
It doesn't happen at the start of the game, but I haven't found a particular trigger, it just happens "after a while".

This started happening after summer update, https://www.dota2.com/summer2023, presumably somehow related to the rendering updates that occurred then.

Steps for reproducing this issue:

1. Play a game.
2. Have a effigies in a base.
3. Towards mid or end game, scroll an effigy into view.
4. Profit from massive rendering artifacts.

[letharion]

Today I played two whole games with no rendering issues from effigies thought for a minute maybe the latest update, which caused a shader refresh, might have fixed the issue. Unfortunately it just happened to flags instead.

[letharion]

I tried the different graphics settings today to see if I could pin down the cause to some particular rendering feature, but even with the "fastest" graphics settings, I still had the same issue.

[letharion]

I have replaced my aging GTX 770 with a GTX 1660 Super instead, and the problem has gone away.
Beyond the hardware upgrade this also let me upgrade the driver from the 400 to 500 series, so the change is pretty big, which means it doesn't help much in narrowing the issue down.
At least it works for me now. :)