[git pull] drm for 5.17-rc1 (pre-merge window pull)
alexdeucher at gmail.com
Mon Jan 10 22:13:04 UTC 2022
On Mon, Jan 10, 2022 at 5:05 PM Daniel Vetter <daniel.vetter at ffwll.ch> wrote:
> On Mon, Jan 10, 2022 at 10:30 PM Linus Torvalds
> <torvalds at linux-foundation.org> wrote:
> > On Thu, Jan 6, 2022 at 10:12 PM Dave Airlie <airlied at gmail.com> wrote:
> > >
> > > git://anongit.freedesktop.org/drm/drm tags/drm-next-2022-01-07
> > Gaah. I merged things and it built cleanly, and I pushed it out.
> > But then I actually *booted* it, and that's not pretty.
> > It *works", but it's almost unusable because of random scanline
> > flickering. I'm not sure how to explain it, but it's as if there
> > wasn't quite enough bandwidth on the scan-out, so you get these lines
> > of noise and/or shifted output. They are temporary - so the
> > framebuffer contents themselves is not damaged (although I don't know
> > how the compositor works - maybe the problem happens before scanout).
> > This is on the same Radeon device:
> > 49:00.0 VGA compatible controller: Advanced Micro Devices, Inc.
> > [AMD/ATI] Ellesmere [Radeon RX 470/480/570/570X/580/580X/590] (rev e7)
> > with dual 4k monitors.
> > Any idea?
Sounds like something related to watermarks. That said, we haven't
really touched the display code for DCE11 cards in quite a while. Can
you provide your dmesg output?
> Since Christian is mostly the compute/memory side, adding some display
> folks for this.
> Daniel Vetter
> Software Engineer, Intel Corporation
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