https://bugzilla.kernel.org/show_bug.cgi?id=206577
Bug ID: 206577 Summary: Periodic screen blanking at a high refresh rate and resolution Product: Drivers Version: 2.5 Kernel Version: 5.5 Hardware: All OS: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: Video(DRI - non Intel) Assignee: drivers_video-dri@kernel-bugs.osdl.org Reporter: tombazley@outlook.com Regression: No
Using a Samsung LC43J892DKUXEN 43" monitor with a Vega 64.
I am unable to set the display output to 3840x1200 @ 120Hz. At 100Hz the display behaves as expected, however at 120Hz the display will turn black briefly as if there is a power loss or as if the source input has changed. This will repeat maybe a couple of times every minute.
I have tested using a ROG Strix RX VEGA64 OC edition and a Sapphire Radeon RX VEGA 64 Nitro+.
I've tested on linux 5.5.2 and mesa 19.3.3, as well as on driver versions 19.9.3, 19.12.3, 19.7.5, 19.12.2, 20.1.1, and 20.2.1 on Windows. I submitted this issue to the AMD bug report a few weeks ago but haven't heard anything back from them, so I am submitting here as well.
I had the monitor sent back to Samsung for testing. They used a STRIX GTX950 and had no issues.
I have tried multiple DisplayPort cables including the one included with the monitor.