[SRU][Artful][PATCH 0/1] UBUNTU: SAUCE: Revert "drm/i915/edp: Allow alternate fixed mode for eDP if available."

[Joseph Salisbury]

BugLink: http://bugs.launchpad.net/bugs/1773520

== SRU Justification ==
The bug reporter states that after update to Kernel 4.13-43 the intel 
graphics seem to really lag - especially noticeable in apps which are 
using vsync, which, at least on his system, locks to 40fps unlike the 
previous kernel.

See https://askubuntu.com/questions/1039189/today-i-got-an-update-and-graphics-are-not-working-right-on-ubuntu-16-04/1040545#1040545 for some other users with the same issue

This regression was introduced by upstream commit dc911f5bd8aa.  A
revert of this commit fixes this bug.  Upstream has already reverted
this commit in drm-tip tree and cc'd it to upstream stable.  However,
the revert has not landed in mainline or stable yet, so it is being sent
as a SAUCE patch.

The revert is also needed in Bionic. However, the Bionic revert is
slightly differant, so it will be SRU'd separately.

== Fix ==
UBUNTU: SAUCE: Revert "drm/i915/edp: Allow alternate fixed mode for eDP if available."

== Regression Potential ==
Low.  This revert is to fix a current regression.

== 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.

Joseph Salisbury (1):
  Revert "drm/i915/edp: Allow alternate fixed mode for eDP if
    available."

 drivers/gpu/drm/i915/intel_dp.c    | 38 +++++---------------------------------
 drivers/gpu/drm/i915/intel_drv.h   |  2 --
 drivers/gpu/drm/i915/intel_dsi.c   |  2 +-
 drivers/gpu/drm/i915/intel_dvo.c   |  2 +-
 drivers/gpu/drm/i915/intel_lvds.c  |  3 +--
 drivers/gpu/drm/i915/intel_panel.c |  6 ------
 6 files changed, 8 insertions(+), 45 deletions(-)

-- 
2.7.4