On 06/21/2011 07:49 PM, Keng-Yu Lin wrote:


SRU Justification

Impact: Not uable to switch to the externel output-only (e.g. VGA or HDMI) mode.
It causes flickering on the externally attached monitor. This bug is common on
many SandyBridge-based laptops.

Fix: Upstream patch to disable PCH ports if needed when disabling a CRTC.

Test case: I tested on Lenovo Zhaoyang E47 and two Dell SandyBridge-based laptops.

BugLink: http://bugs.launchpad.net/bugs/791752

This backport patch is not in 2.6.38.y because of its end-of-life.
For the reference, the patch helps LP#745112 too, though not perfectly.


Keng-Yu Lin (1):
drm/i915: disable PCH ports if needed when disabling a CRTC

drivers/gpu/drm/i915/i915_reg.h | 15 ++++++++
drivers/gpu/drm/i915/intel_display.c | 61 +++++++++++++++++++++++++++++----
2 files changed, 68 insertions(+), 8 deletions(-)




--
Tim Gardner tim.gardner@canonical.com

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