APPLIED: [PATCH 0/1][SRU][Focal] Dell XPS 13 9300 mirror mode doesn't work sometimes with WD19TB

[Khaled Elmously]

On 2020-05-06 10:50:03 , AceLan Kao wrote:
> BugLink: https://bugs.launchpad.net/bugs/1877013
> 
> [Impact]
> Connect HDMI monitor on WD19TB dock and connect WD19TB to Dell XPS 13
> 9300, toggling the display mode to mirror sometimes got a blank screen on
> external monitor.
> 
> [Fix]
> After bisect kernel and found below commit(from v5.7-rc2) improves the
> stability
> bcad588dea53 drm/i915/perf: Do not clear pollin for small user read buffers
> 
> [Test]
> Verified on Dell XPS 13 9300 with WD19TB docking station, the fail rate
> becomes from 1/2 to 1/30
> 
> [Regression Potential]
> Low, this commit has been CC'd to stable, so we will have this soon.
> 
> [Misc]
> OEM-5.6 has this commit from v5.6.6 stable update
> 
> Ashutosh Dixit (1):
>   drm/i915/perf: Do not clear pollin for small user read buffers
> 
>  drivers/gpu/drm/i915/i915_perf.c | 65 ++++++--------------------------
>  1 file changed, 11 insertions(+), 54 deletions(-)
> 
> -- 
> 2.25.1
> 
> 
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