[Bug 104194] HDMI with RX460 not working on linux 4.15-rc2 with DC enabled and linux-amd-staging-drm-next

[Bug 104194] HDMI with RX460 not working on linux 4.15-rc2 with DC enabled and linux-amd-staging-drm-next

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https://bugs.freedesktop.org/show_bug.cgi?id=104194

            Bug ID: 104194
           Summary: HDMI with RX460 not working on linux 4.15-rc2 with DC
                    enabled and linux-amd-staging-drm-next
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: critical
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: laichiaheng@outlook.com

Graphics: Card: Advanced Micro Devices [AMD/ATI] Baffin [Radeon RX 460/560D /
Pro 450/455/460/560] 
Display Server: x11 (X.Org 1.19.5 ) driver: amdgpu Resolution:
1920x1080@60.00hz 
OpenGL: renderer: AMD Radeon RX 460 Graphics (POLARIS11 / DRM 3.23.0 /
4.15.0-rc2-mainline, LLVM 6.0.0) 
version: 4.5 Mesa 17.4.0-devel (git-4c7af87fb9)


GRUB_CMDLINE_LINUX_DEFAULT="quiet amdgpu.dc=1"


Nothing is output to the HDMI when amdgpu.dc is enabled

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[Bug 104194] HDMI with RX460 not working on linux 4.15-rc2 with DC enabled and linux-amd-staging-drm-next

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https://bugs.freedesktop.org/show_bug.cgi?id=104194

laichiaheng@outlook.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|medium                      |high

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[Bug 104194] HDMI with RX460 not working on linux 4.15-rc2 with DC enabled and linux-amd-staging-drm-next

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https://bugs.freedesktop.org/show_bug.cgi?id=104194

--- Comment #1 from laichiaheng@outlook.com ---
I've found a solution to make it work, just re-plug-in the HDMI cable from the
GPU side (not the screen side)

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[Bug 104194] HDMI with RX460 not working on linux 4.15-rc2 with DC enabled and linux-amd-staging-drm-next

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https://bugs.freedesktop.org/show_bug.cgi?id=104194

--- Comment #2 from Jerry Zuo <Jerry.Zuo@amd.com> ---
(In reply to laichiaheng from comment #1)
> I've found a solution to make it work, just re-plug-in the HDMI cable from
> the GPU side (not the screen side)

I've checked the top of the amd-staging-drm-next(59b8f814a) but don't see the
issue. 4K HDMI display connected on Baffin could light up. Please check it as
well, and see if the issue still exists.

Please also let me know which build you have used to have this issue
reproduced. Thanks.

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[Bug 104194] HDMI with RX460 not working on linux 4.15-rc2 with DC enabled and linux-amd-staging-drm-next

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https://bugs.freedesktop.org/show_bug.cgi?id=104194

--- Comment #3 from saunders.52@wright.edu ---
I am having this issue as well on 4.15.1 without DC enabled (as well as DC
enabled) on a RX 460. Will try the cable replug on GPU side (didn't work on
monitor side.)

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[Bug 104194] HDMI with RX460 not working on linux 4.15-rc2 with DC enabled and linux-amd-staging-drm-next

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https://bugs.freedesktop.org/show_bug.cgi?id=104194

--- Comment #4 from saunders.52@wright.edu ---
Unplugging and replugging the cable on the GPU side causes the monitor to be
detected without DC enabled. (Haven't checked with DC.)

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[Bug 104194] HDMI with RX460 not working on linux 4.15-rc2 with DC enabled and linux-amd-staging-drm-next

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https://bugs.freedesktop.org/show_bug.cgi?id=104194

--- Comment #5 from saunders.52@wright.edu ---
Is there any info that would be useful to provide in order to help debug this
issue? It's occurring on a stable build for me, unlike the other person with
this problem.

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[Bug 104194] HDMI with RX460 not working on linux 4.15-rc2 with DC enabled and linux-amd-staging-drm-next

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--- Comment #6 from Jordan L <jordan.lazare@amd.com> ---
Hi,

Would you mind posting your dmesg and X logs while the monitor is black?

Does the monitor show up as enabled on xrandr?

Thanks

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[Bug 104194] HDMI with RX460 not working on linux 4.15-rc2 with DC enabled and linux-amd-staging-drm-next

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https://bugs.freedesktop.org/show_bug.cgi?id=104194

--- Comment #7 from saunders.52@wright.edu ---
(In reply to Jordan L from comment #6)
> Hi,
> 
> Would you mind posting your dmesg and X logs while the monitor is black?
> 
> Does the monitor show up as enabled on xrandr?
> 
> Thanks

Um... I can't replicate anymore. The bug triggered reliably on Arch for me on
4.15.1, but Arch has since updated to 4.15.3 and this has... somehow caused the
card to start recognizing the HDMI card on boot (in non-DC mode when I just
booted it, twice). I'd been using the 4.14 series of LTS kernels in the
meantime, and none of the changes had seemed to indicate anything that would
fix it in the 4.15.x point releases...
Good work, I guess. Sorry about the wasted time, if it occurs again (it
triggered a bunch for me on a few days after 4.15.x came out) I'll post the
logs.

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[Bug 104194] HDMI with RX460 not working on linux 4.15-rc2 with DC enabled and linux-amd-staging-drm-next

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https://bugs.freedesktop.org/show_bug.cgi?id=104194

--- Comment #8 from saunders.52@wright.edu ---
Hmm... going by Arch Linux package differences, the dmesg output, and the fact
I suddenly have working HDMI support, they seem to have set AMDGPU DC to be on
by default now on the 4.15 kernels for pre-Vega cards without a command line
setting, which might have something to do with it.

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[Bug 104194] HDMI with RX460 not working on linux 4.15-rc2 with DC enabled and linux-amd-staging-drm-next

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https://bugs.freedesktop.org/show_bug.cgi?id=104194

Alex Deucher <alexdeucher@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

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