[SRU][PATCH 0/1] UBUNTU: SAUCE: drm/i915: Fix detection for a CMP-V PCH

You-Sheng Yang vicamo.yang at canonical.com
Wed Nov 13 11:13:21 UTC 2019


From: You-Sheng Yang <vicamo at gmail.com>

BugLink: https://bugs.launchpad.net/bugs/1852386

[Impact]
Bug 1849278 introduced a regression on some Comet Lake platforms that
device may have no video output on HDMI port.

[Fix]
A currently in-review patch
https://patchwork.freedesktop.org/patch/340416 should be applied to
correct PCH's identity and restore HDMI output.

[Test Case]
1. Apply the patches to oem-osp1 kernel >= 1026 or Eoan/Focal generic
kernels.
2. Boot affected platforms with HDMI cable connected to an external
monitor.
3. Check if the monitor lights up when GDM service is started.

This was verified in to victim platforms.

[Regression Risk]
Low. This should affects only systems with matching PCH hw that is
currently affected by the regression to be fixed.

Imre Deak (1):
  UBUNTU: SAUCE: drm/i915: Fix detection for a CMP-V PCH

 drivers/gpu/drm/i915/i915_drv.c | 6 +++++-
 drivers/gpu/drm/i915/i915_drv.h | 2 +-
 2 files changed, 6 insertions(+), 2 deletions(-)

-- 
2.20.1




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