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SubjectRe: [Intel-gfx] Graphics on thinkpad x270 after dock/undock works only for the first time (CPU pipe B FIFO underrun)
On Sat, Dec 30, 2017 at 12:53:58PM +0000, Jiri Kosina wrote:
> On Sat, 30 Dec 2017, Jiri Kosina wrote:
>
> > Seems like disabling RC6 on the kernel command line works this around, and
> > I can dock / undock several times in a row with the image always coming
> > up properly on the external display.
> >
> > On the first undock, the WARN_ONCE() below triggers, so I believe each
> > undock leaks memory.
> >
> > [ 38.755084] Failed to release pages: bind_count=1, pages_pin_count=1, pin_global=0
> > [ 38.755138] WARNING: CPU: 3 PID: 96 at ../drivers/gpu/drm/i915/i915_gem_userptr.c:89 cancel_userptr+0xe5/0xf0 [i915]
>
> OK, I am seeing this warning with current Linus' tree (5aa90a845) even
> without any attempt to dock/undock, so it's probably unrelated to external
> outputs and it only by coincidence appeared originally at the same time I
> docked the machine.
>
> So there are two separate issues on this machine with latest kernel
> (neither of them probably being regression):
>
> - I have to disable i915 RC6 at the kernel cmdline, otherwise external
> (dock) display gets output only randomly (seems like always only on
> first dock)

Joonas, Chris, time to bring rc6_enable back on next-fixes before we
remove this support entirely?

>
> - the warning, which triggers at not really deterministic time after boot,
> but usually rather quickly

Jiri, could you please report these issues separately on bugs.freedesktop.org?
Are them regressions? Possible bisect?
Please attach the dmesg booting with drm.debug=0x1e

>
> --
> Jiri Kosina
> SUSE Labs
>
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/intel-gfx

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