* [Bug 103080] DC driver from drm-next-4.15-dc branch (upstream PR) not working
[not found] <bug-103080-502@http.bugs.freedesktop.org/>
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https://bugs.freedesktop.org/show_bug.cgi?id=103080
Michel Dänzer <michel@daenzer.net> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |harry.wentland@amd.com
Product|xorg |DRI
QA Contact|xorg-team@lists.x.org |
Component|Driver/AMDgpu |DRM/AMDgpu
Assignee|xorg-driver-ati@lists.x.org |dri-devel@lists.freedesktop
| |.org
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2017-10-03 17:00 ` [Bug 103080] DC driver from drm-next-4.15-dc branch (upstream PR) not working bugzilla-daemon
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https://bugs.freedesktop.org/show_bug.cgi?id=103080
--- Comment #1 from Harry Wentland <harry.wentland@amd.com> ---
Hi Carlo,
please pass amdgpu.dc=1 module parameter or set CONFIG_DRM_AMD_DC_PRE_VEGA flag
at build.
With this branch we decided to only enable it by default for Vega ASICs. With
anything older than Vega you'll have to force enable it.
Harry
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2017-10-03 17:00 ` [Bug 103080] DC driver from drm-next-4.15-dc branch (upstream PR) not working bugzilla-daemon
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https://bugs.freedesktop.org/show_bug.cgi?id=103080
--- Comment #2 from Carlo Caione <carlo@caione.org> ---
Created attachment 134643
--> https://bugs.freedesktop.org/attachment.cgi?id=134643&action=edit
CONFIG_DRM_AMD_DC_PRE_VEGA kernel Oops
(In reply to Harry Wentland from comment #1)
> Hi Carlo,
>
> please pass amdgpu.dc=1 module parameter or set CONFIG_DRM_AMD_DC_PRE_VEGA
> flag at build.
This is interesting. When compiling with CONFIG_DRM_AMD_DC_PRE_VEGA I get a
kernel Oops when connecting the HDMI cable, see the attached log.
But (good news) if I revert
https://cgit.freedesktop.org/~agd5f/linux/commit/?id=8f5ed2ed31944eea5c2746ec66417afac043eabd
I have no kernel Oops and HDMI works fine. So something is definitely wrong
with that commit.
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--- Comment #3 from Harry Wentland <harry.wentland@amd.com> ---
We've got a fix incoming in a day or two for that kernel oops with the next set
of DC patches.
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--- Comment #4 from Carlo Caione <carlo@caione.org> ---
Great, thank you.
Any special reason why you decided to disable the DC support for pre-VEGA
ASICs?
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--- Comment #5 from Harry Wentland <harry.wentland@amd.com> ---
We want to avoid any regression since pre-Vega is already supported by non-DC.
Generally I have a lot more faith in DC but there could always be corner cases.
Vega is a new ASIC so by definition there won't be regressions (unless we mess
with non-display stuff).
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--- Comment #6 from Daniel Drake <dan@reactivated.net> ---
Harry, HDMI audio is not working for us on the non-DC driver on this hardware
(AMD A10-9620P RADEON R5, 10 COMPUTE CORES 4C+6G). Are you saying non-DC should
be working fine there?
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--- Comment #7 from Dave Airlie <airlied@freedesktop.org> ---
Daniel,
not working HDMI audio is a missing feature, not a regression. Not enabling dc
by default on older GPUs is to avoid regressions in working features. After
some testing it will get enabled.
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--- Comment #8 from Daniel Drake <dan@reactivated.net> ---
Got it. We have a number of affected systems here, so we will help with testing
efforts, reporting bugs and successes.
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Martin Peres <martin.peres@free.fr> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |MOVED
--- Comment #9 from Martin Peres <martin.peres@free.fr> ---
-- GitLab Migration Automatic Message --
This bug has been migrated to freedesktop.org's GitLab instance and has been
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You can subscribe and participate further through the new bug through this link
to our GitLab instance: https://gitlab.freedesktop.org/drm/amd/issues/242.
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