[Bug 105039] No 120hz with 4.15 kernel and DC enabled

[Bug 105039] No 120hz with 4.15 kernel and DC enabled

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https://bugs.freedesktop.org/show_bug.cgi?id=105039

            Bug ID: 105039
           Summary: No 120hz with 4.15 kernel and DC enabled
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: unit73e@gmail.com

Since kernel 4.15 only 60hz is available. Forcing 120hz results in a blank
screen. Only happens with DC enabled.

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[Bug 105039] No 120hz with 4.15 kernel and DC enabled

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https://bugs.freedesktop.org/show_bug.cgi?id=105039

--- Comment #1 from Matthew Scheirer <matt.scheirer@gmail.com> ---
Same issue with 4.15 / Mesa 17.3 / Xorg 1.19.6 on a 290 + Acer GN246HL. No DC
the 144 / 120 / etc modes show up, DC only 60hz does.

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[Bug 105039] No 120hz with 4.15 kernel and DC enabled

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https://bugs.freedesktop.org/show_bug.cgi?id=105039

--- Comment #2 from Marc Cousin <cousinmarc@gmail.com> ---
I'm having a variant of this… cannot go over 1920x1080p

4.15, mesa 17.3, xorg 1.19.6, RX570. Deactivating DC makes resolutions
available again.

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[Bug 105039] No 120hz with 4.15 kernel and DC enabled

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https://bugs.freedesktop.org/show_bug.cgi?id=105039

--- Comment #3 from Harry Wentland <harry.wentland@amd.com> ---
This should be fixed in our staging branches.

Can you try either the amd-staging-drm-next or drm-next-4.17-wip branch from
Alex's repo. You can find it at
https://cgit.freedesktop.org/~agd5f/linux/?h=amd-staging-drm-next

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[Bug 105039] No 120hz with 4.15 kernel and DC enabled

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https://bugs.freedesktop.org/show_bug.cgi?id=105039

--- Comment #4 from Emanuel Couto <unit73e@gmail.com> ---
(In reply to Harry Wentland from comment #3)
> This should be fixed in our staging branches.
> 
> Can you try either the amd-staging-drm-next or drm-next-4.17-wip branch from
> Alex's repo. You can find it at
> https://cgit.freedesktop.org/~agd5f/linux/?h=amd-staging-drm-next

I confirmed this bug is fixed on amd-staging-drm-next branch (commit:
82beba2883b2). I'll test drm-next.4.17-wip later as well just to be sure. I
assume this fix is going to be in kernel 4.16 (or already is)?

BTW I really like what AMD is doing regarding Linux. Thanks.

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[Bug 105039] No 120hz with 4.15 kernel and DC enabled

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https://bugs.freedesktop.org/show_bug.cgi?id=105039

Emanuel Couto <unit73e@gmail.com> changed:

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

--- Comment #5 from Emanuel Couto <unit73e@gmail.com> ---
(In reply to Emanuel Couto from comment #4)
> (In reply to Harry Wentland from comment #3)
> > This should be fixed in our staging branches.
> > 
> > Can you try either the amd-staging-drm-next or drm-next-4.17-wip branch from
> > Alex's repo. You can find it at
> > https://cgit.freedesktop.org/~agd5f/linux/?h=amd-staging-drm-next
> 
> I confirmed this bug is fixed on amd-staging-drm-next branch (commit:
> 82beba2883b2). I'll test drm-next.4.17-wip later as well just to be sure. I
> assume this fix is going to be in kernel 4.16 (or already is)?
> 
> BTW I really like what AMD is doing regarding Linux. Thanks.

Finished testing drm-next-4.17-wip branch (commit: d0d4f398ddc0). This bug is
solved in both branches.

Thanks. Marked as fixed.

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