Comment # 80
on bug 110674
from Tom B
> I tried something like that before but a huge portion of the commits in that range won't build kernels that can boot (at least on my system). I ended up resorting to trying reverting individual vega20-affecting commits out of 5.1. See my results far above in the thread (though someone else willing to spend more time doing a deeper analysis of the code could probably take my approach much further). That's why my focus has been finding places in the code where something different happens based on the number of displays. Though this may be a futile avenue of exploration as it could just be an issue of additional memory bandwith requirements or even something that should be done differently with 2 displays that isn't. > It does make me wonder if it's worth testing like 2 simple 1080p 60 Hz displays. Maybe that wouldn't trigger this issue. Not that that would really be of use to me. But it might help distinguish between just monitor detect generally being broken and "high monitor load" being broken . . . This would be an interesting test but I think 1080p 60hz monitors with displayport are fairly uncommon and I don't have any to test with. My guess is anyone with a Radeon VII, a high end card with 16gb VRAM, is likely to have a high end display which could equally explain why there are no reports here of people running 1080p 60hz displays. My next test is going to be logging dpm_table->dpm_state.hard_min_level on line 3354 (just before it's sent to the smc) on both 5.0.13 and 5.2.7 to see if the same hard_min_level value is sent to the smc on both kernels. This will at least let us know whether it's something that's incorrectly setting hard_min_level or something that prevents the smc accepting the value. My hunch from my previous tests is that it's the latter but I'll try it and report back. I know nothing about driver development so I have no idea how this stuff should work, I can only compare the differences between 5.0.13 and later kernels. Anyway, thanks everyone for your input. Any information, even on things that you tried and didn't work, is valuable as it can help us narrow down the problem.
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