[Bug 200695] Blank screen on RX 580 with amdgpu.dc=1 enabled (no displays detected)

bugzilla-daemon at bugzilla.kernel.org bugzilla-daemon at bugzilla.kernel.org
Sat May 30 19:22:27 UTC 2020


--- Comment #42 from babgozd (babgozdtb at outlook.com) ---
(In reply to Meric07 from comment #41)
> (In reply to Alex Deucher from comment #40)
> > (In reply to Meric07 from comment #39)
> > > I experience the same problem with a R9 380X. Still can't boot into any
> > > distro with DC enabled. My monitor doesn't offer any other connection
> than
> > > VGA input, my GPU only offers DVI output, so i use a VGA to DVI adapter.
> > > It's disappointing this issue still continues after so many kernel
> > > revisions. I'll watch this thread hoping for good news.
> > 
> > I don't think this is related to the original report.  Does passing
> > amdgpu.dc=0 on the kernel command line in grub fix the issue?
> Yes, with dc=0 the system starts up normally. I'm not sure if this is a fix
> or a workaround though.

It has to be just a workaround. There is a problem with AMDGPU Display Code or
something that utilizes it but since even console goes black, problem is
something within kernel. Setting "amdgpu.dc=0" basically disable AMDGPU Display
Code so we do not benefit from it.

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