[Bug 95741] Broadwell graphics on Dell XPS13 (early 2015) loses horizontal sync on shift to tty console

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=95741

--- Comment #13 from W Unruh <unruh at physics.ubc.ca> ---
Created attachment 173151
  --> https://bugzilla.kernel.org/attachment.cgi?id=173151&action=edit
kernel bisect log

Here is the kernel bisect log. 

OK, sorry about that rant. It is always uncomfortable when one's illusion of
how the world work meets with reality. In this case my linear model of how
kernel development works with the actuallity of multiple threads in kernel
development, not all of which come together at any one release. Ie, threads
which  
Anyway, I finally finished my bisection-- I should probably have told it to
concentrate on drm/i915, since that is where it finished up. 

# first bad commit: [cf4c7c12258ed9367f4fc45238f5f50d2db892c1] drm/i915: Make
all plane disables use 'update_plane' (v5)

(This is not what Nils got. There must have been a similar problem on an
earlier kernel sequence, which got fixed and then broken again.)

Note that while for the Mageia 3.19.2 it (sometimes) loses hsync on shutdown
(although the tty consoles work) on the bisections, at least toward the end,
the hsync was good on the good kernels, and bad on the bad kernels. 
Now I did not test any of the kernels in the bisection extensively. (about 3 or
four tty selections after X login, and one or two at the KDM screen) and only
shutdown once each time, so there may be sporadic problems there still.

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