APPLIED: [RESEND][SRU][Artful][PATCH 0/1] drm/i915/fbdev: Always forward hotplug events

[Khaled Elmously]

Applied to artful

On 2018-01-10 14:52:58 , Joseph Salisbury wrote:
> BugLink: http://bugs.launchpad.net/bugs/1724911
> 
> == SRU Justification ==
> The bug reporter states that after upgrading his laptop to Ubuntu 17.10, he was
> unable to access gettys on any of the text-mode VTs on his system.
> 
> gdm3 is running on VT1, his user session is running on VT2. He could switch 
> between these. If he switched to VT3, the display retained the output of 
> his X session, and the text console with getty never appears.  Switching 
> back to VT2 works fine.
> 
> The same problem was occuring with either Wayland or X.
> 
> This bug is a regression in Artful introduced by mainline commit:
> 7581d5ca2bb ("drm/i915/fbdev: Check for existence of ifbdev->vma before operations").
> 
> It was first found that this bug was fixed in v4.14-rc1.  However, after a lengthy
> "Reverse" bisect, the exact commit could not be identified.  This is because the 
> fix came in via a merge base.  A regular bisect was then done to identify commit
> 7581d5ca2bb as the offending commit that introduced the bug.  Using the file 
> that this commit touched, a "Reverse" bisect was done again between 
> 7581d5ca2bb..v4.14-rc1.  This identified the following commit 88be58be886f as 
> the fix to this regression.
>     
> 
> == Fix ==
> commit 88be58be886f1215cc73dc8c273c985eecd7385c
> Author: Daniel Vetter <daniel.vetter at ffwll.ch>
> Date:   Thu Jul 6 15:00:19 2017 +0200
> 
>     drm/i915/fbdev: Always forward hotplug events
> 
> 
> == Regression Potential ==
> This patch fixes a current regression and is a minor one-liner.
> 
> == Test Case ==
> A test kernel was built with this patch and tested by the original bug reporter.
> The bug reporter states the test kernel resolved the bug.
> 
> 
> Daniel Vetter (1):
>   drm/i915/fbdev: Always forward hotplug events
> 
>  drivers/gpu/drm/i915/intel_fbdev.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> -- 
> 2.7.4
> 
> 
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