Comment # 69
on bug 110674
from ReddestDream
>The inconsistent nature of this bug and the fact that it sometimes doesn't appear suggests a race condition. I'd assume something else on the system happens before or after amdgpu is expecting. >Is there any way to delay loading the amdgpu driver and manually loading it after everything else? Based on all the data you (Tom B) and others have provided as well as my own tests, my current suspicion is that there is a bug in the display mode/type detection and enumeration, leading to the driver losing state consistency and eventually contact entirely with the hardware. I think the clock dysregulation and excessive voltage/wattage are symptoms of the underlying disease rather than the cause. If something is wrong between what the driver thinks the hardware state is and what the hardware state actually is, it's only a matter of time before this inconsistency leads to dysregulation, instability, and crashing. For this reason, I'm not convinced there is any better workaround than "just use one monitor." Pushing up the clocks only seems to at best prolong the inevitable. :( I'm also not convinced there is one commit in particular to point to here. Rather it was probably in the restructuring of something between 5.0 and 5.1 that it became fundamentally broken while it was always somewhat flawed before. Unfortunately, Radeon VII probably isn't really being tested by kernel developers anymore and it's likely that multimonitor with this card on Linux was never fully tested at all. It also seems like AMD's kernel development has moved on to Navi and that the upcoming new Vega card, Arcturus, won't have display outs at all, so work on that can't fix this issue. As this card is fairly uncommon and expensive, the only real hope for a fix seems to be to get the card into the hands of someone who has the skill to fix graphics drivers and a willingness/need to test multimonitor. Perhaps someone like gnif who has been able to solve the infamous Vega Reset Bug on Vega 10 cards might be able to fix it. It's likely he will encounter our issue while testing Radeon VII with Looking Glass and such. Someone has already offered to lend him a Radeon VII as he states in the video, so there's some hope that his work will lead to a solution. https://www.youtube.com/watch?v=1ShkjXoG0O0
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