shinys000114/linux
1
0
Fork 0
mirror of https://github.com/hardkernel/linux.git synced 2026-06-11 05:17:10 +09:00
Code Issues Packages Projects Releases Wiki Activity

drm/i915: Disable FBC by default also on Haswell and later

Browse Source 
commit 0368920e51 upstream.

It causes black screen on bootup and is approximately 100x slower than
running with FBC disabled, so the GPU runs at a high frequency for much
longer - completely contrary to the power saving claims. It also still
has mutex deadlocks in multi-head scenarios, which can lead to a
system/X lockup. These bugs were known before FBC was enabled by default
on Haswell and still have not been fixed.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=79716
Reported-and-tested-by: Jon Kristensen <info@jonkri.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
[Jani: update subject to reflect the actual change]
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Chris Wilson
2014-06-06 10:37:11 +01:00
committed by Greg Kroah-Hartman
parent 844c3b7228
commit f4db98240a
1 changed files with 1 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/gpu/drm/i915/intel_pm.c
View File

@@ -511,8 +511,7 @@ void intel_update_fbc(struct drm_device *dev)
obj = intel_fb->obj;
adjusted_mode = &intel_crtc->config.adjusted_mode;
if (i915.enable_fbc < 0 &&
INTEL_INFO(dev)->gen <= 7 && !IS_HASWELL(dev)) {
if (i915.enable_fbc < 0) {
if (set_no_fbc_reason(dev_priv, FBC_CHIP_DEFAULT))
DRM_DEBUG_KMS("disabled per chip default\n");
goto out_disable;