Output to DVI-I (or DVI-D) is blank on Tonga (R9 285 and 380X) with multiple monitors
Submitted by Brian Paterni
Assigned to Default DRI bug account
Description
Created attachment 116902
dmesg for e965b8ce4215ac2b22b23ffc8a8dfbae964b9496
I have a radeon r9 285 (tonga) and I'm trying to run dual DVI displays via the new AMDGPU driver. The problem I'm having though is that the display connected to the DVI-I output goes blank during drm initialization on boot, and thereafter never 'recovers'. If I plug either DVI-D or DVI-I in individually, however, and disconnect the other on a fresh boot, either outputs work just fine. Additionally, dual displays do work if I use any combination of DVI-D, HDMI, or DisplayPort; which leads me to believe that the problem has something to do with how amdgpu is handling output to DVI-I or a hardware problem. Hopefully it is not the latter.
Please let me know if there is anything I can do to help debug this problem!
I'm using Debian unstable, with the latest linux kernel compiled from git mainline (e965b8ce4215ac2b22b23ffc8a8dfbae964b9496)
dmesg and Xorg log should be attached.
Attachment 116902, "dmesg for e965b8ce4215ac2b22b23ffc8a8dfbae964b9496":
dmesg.amdgpu