Timur Kristóf, working as a contractor on Valve’s open-source Linux graphics driver team, is known for his contributions to the RADV Vulkan driver and the ACO shader compiler. Recently, he’s been digging into improvements for the AMDGPU kernel driver—and the most notable one? Adding support for analog display connectors in the AMDGPU “DC” (Display Core) code.
Now, why does this matter?
Most older AMD GPUs (specifically GCN 1.0 and GCN 1.1) are stuck using the legacy Radeon driver by default on Linux. That driver’s stable but mostly untouched these days—barely receiving updates. The newer AMDGPU driver, on the other hand, supports more modern features, better Vulkan compatibility, and overall improved performance. But because it lacked analog support in DC (which matters for older monitors using DVI-I/VGA), these GPUs couldn’t use it out of the box.
Here’s what Timur is fixing:
- He’s adding analog connector support for DCE6 to DCE10 GPUs (that covers a range of GCN 1.0 and 1.1 cards).
- Some Tonga and Hawaii cards already use DC and have DVI-I connectors—but the analog part doesn’t work properly. Timur’s patches fix that.
- For GPUs like Southern Islands (GCN 1.0) and Sea Islands (GCN 1.1) that don’t use AMDGPU by default, lack of analog support was one of the last major blockers. This patch helps remove that obstacle.
He’s doing this by referencing the old amdgpu legacy display code and setting up DAC (Digital-to-Analog Converter) via VBIOS, which is how AMD originally handled analog signals.
Timur broke the update into several key pieces:
- Minor changes to the DC subsystem to support analog streams and link encoders.
- Analog link detection and polling.
- DAC load detection—important for identifying older displays and adapters.
So what’s the bigger picture?
Well, with analog now working, there’s a real possibility that GCN 1.1 (and even GCN 1.0) could finally default to using AMDGPU instead of the aging Radeon driver. That’s a major shift. No one expected AMD to go back and polish up support for decade-old GPUs, but with Valve’s backing and Kristóf’s engineering, it’s becoming reality.
This not only gives those older cards a new lease on life but also centralizes AMD GPU support under one modern, better-maintained driver. And that’s good news for Linux users still running older Radeon hardware.
