Unreliable Modesetting on Tonga with two DVI Screens

Submitted by Thomas R.

Assigned to Default DRI bug account

Link to original bug (#105433)

Description

Two devices connected via DVI, one not coming up (powersave, no signal). On retry , they may swap their working state, or both go to energy save, or rarely, both work. This happens regardless of resolutions set on the screens in question.

Screens: 2 x Benq G2222HDL
Connected via DVI (both straight to card)

Card: ASUS Strix R9285 DC2OC 2GD5

Kernel: amd-staging-drm-next 6e62bc7a123b "drm/amdgpu:Always save uvd vcpu_bo in VM Mode"

Bug report as discussed in bug 100919.
Possibly related to bug 91202.