[Bug 109215] intermittent display on kaby lake/i915 from kernel 4.19 onwards

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109215

--- Comment #11 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
(In reply to masterpatricko from comment #6)
> I am able to reproduce with 5.0-rc3 drm-tip from git
> 08f37be937e0f3c2904d4250b0858e9ea9d72623 .
> i915.fastboot=1 gives stable (within observation time) display, while
> i915.fastboot=0 exhibits intermittent display. 
> Kernel 4.18 is still working in all cases.
> Also seems dependent on whether the system is on AC power, on battery the
> display is mostly working with only occasional blanking, while on AC the
> display is mostly black with only very occasional moments showing the system
> is actually working.
> 
> Previous attachment is dmesg shortly after booting 5.0-rc3 from drm-tip (and
> with drm.debug=0x1e log_buf_len=4M) with fastboot=0. The problem was
> occurring as this log was saved.
> 
> Issue is quite reproducible so let me know if more logs (or "good" logs with
> fastboot=1) would help.

Output from intel_watermark (from
git://anongit.freedesktop.org/xorg/app/intel-gpu-tools) for the fastboot=0
flickering case and the fastboot=1 non-flickering case would be nice.

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