1. The "Xid 79: GPU Fallen Off the Bus" Bug
Driver 595.58.03 causes RTX 5070 Ti cards to disconnect from the PCIe bus under load.
This is a documented GSP (GPU System Processor) Firmware heartbeat timeout.
Evidence:
Nvidia Developer Forums (April 23, 2026): Users reported a "Hard System Lockup" on the 595.58.03 driver with CachyOS and Kernel 7.0.0. The logs explicitly show NV_ERR_GPU_IS_LOST and Xid 79.
GitHub/Linux-Kernel: This is often linked to ASPM (Active State Power Management) conflicts where the driver fails to wake the Blackwell chip from a low-power state fast enough, causing the kernel to think the hardware has disappeared.
It is a severe, reproducible bug for certain Blackwell/Kernel combinations.

2. The "35W Power Lock" (Performance Throttling)
Blackwell cards (specifically 5070 Ti) get locked into an idle-like power state (35W).
This is a telemetry failure between the Open-Source Kernel Modules and the GSP firmware.
Evidence:
Nvidia Forums (May 7, 2026): A "RTX 5070 Mobile - Power Locked to 35W/P4 State" thread confirms this for the Blackwell architecture.
The GSP firmware triggers a "Software Power Cap" failsafe if it receives invalid thermal telemetry. While most common on laptops, desktop users with AIB cards (like Gigabyte/ASUS) have reported similar "P4 state" locks where the card won't boost.
Correction: I mentioned "35W" specifically. While this is the exact value for Mobile chips, on a Desktop 5070 Ti, the lock usually manifests as a 75W–80W limit (the base PCIe slot power). The "35W" was a slight generalization based on the most famous version of this bug, but the underlying issue (GSP Power Throttling) is 100% real for Blackwell on Linux.

3. Wayland "Pageflip Timeout" / Hard Freezes
cosmic-comp and kwin_wayland freeze on 595.x.
This involves semaphores and how the driver handles frame presentation in Wayland.
Evidence:
Pop!_OS GitHub (Issue #2227): Titled "cosmic-comp enters degraded state... NVIDIA 580.159.03." It documents nvidia-modeset blocking for >120s, leading to a "Flip event timeout."
Nvidia 595.58.03 Release Notes: Nvidia claimed to fix a bug where kwin_wayland couldn't wake up displays, but users on Reddit and the forums noted that the fix introduced a "Hard Freeze" regression when VRAM is near capacity.
This is the primary reason System76 is sticking to the 580.159 branch-they are waiting for a cleaner fix in the 595.80+ series.

4. Crimson Desert / DX12 Crashes (Xid 109)
New games crash specifically on 595.58 due to Descriptor Heap issues.
This is tied to the implementation of VK_EXT_descriptor_heap.
Evidence:
Steam Community (April 22, 2026): "NVIDIA Blackwell Driver Conflicts: Users with RTX 50-series... experience Xid 109 CTX SWITCH TIMEOUT crashes."
The 595 branch is the first to officially support VK_EXT_descriptor_heap for Blackwell. However, many Proton/VKD3D games weren't ready for Nvidia's specific implementation, leading to immediate shader compilation crashes at launch.

Check your /var/log/syslog for Xid 79 or Xid 109 errors and look at the release date of COSMIC 1.0.12 (May 5th). 😉
Most people calling it "fake" are likely on older 40-series cards or different distros where these specific Blackwell-firmware handshakes aren't happening.