[Bug 76345] New: [Bisected BDW drm-intel-fixes] Enable PSR feature by insert kernel parameter "i915.enable_psr=1", will cause x fail to start
bugzilla-daemon at freedesktop.org
bugzilla-daemon at freedesktop.org
Tue Mar 18 23:30:46 PDT 2014
https://bugs.freedesktop.org/show_bug.cgi?id=76345
Priority: medium
Bug ID: 76345
CC: intel-gfx-bugs at lists.freedesktop.org
Assignee: intel-gfx-bugs at lists.freedesktop.org
Summary: [Bisected BDW drm-intel-fixes] Enable PSR feature by
insert kernel parameter "i915.enable_psr=1", will
cause x fail to start
QA Contact: intel-gfx-bugs at lists.freedesktop.org
Severity: major
Classification: Unclassified
OS: Linux (All)
Reporter: wendy.wang at intel.com
Hardware: x86 (IA32)
Status: NEW
Version: unspecified
Component: DRM/Intel
Product: DRI
By kernel default setting, PSR feature is false, we need insert
"i915.enable_psr=1" parameter in kernel to enable the PSR in kernel, after
reboot, run xinit &, x fail to start.
this issue happened from 2014_03_07 nightly branch to the latest nightly
branch, before that no such issue.
Do bisect find drm-intel-fixes branch,
24bd9bf54d45d28089251cdf62bf14323d1aa827 is the first bad commit, revert this
commit, issue disappeared.
This issue found on BDW platform, did not reproduce on HSW platform.
commit 24bd9bf54d45d28089251cdf62bf14323d1aa827
Author: Ben Widawsky <benjamin.widawsky at intel.com>
Date: Tue Mar 4 22:38:10 2014 -0800
drm/i915: Fix PSR programming
| has a higher precedence than ?. Therefore, the calculation doesn't do
at all what you would expect. Thanks to Ken for convincing me that this
was indeed the issue. Send me back to C programmer school, please.
I'm sort of surprised PSR was continuing to work for people. It should
be broken IMO (and it was broken for me, but I had assumed it never
worked).
Regression from:
commit ed8546ac1f99b850879f07b1e9b06b42fb0a36d9
Author: Ben Widawsky <benjamin.widawsky at intel.com>
Date: Mon Nov 4 22:45:05 2013 -0800
drm/i915/bdw: Support eDP PSR
Cc: Rodrigo Vivi <rodrigo.vivi at gmail.com>
Cc: Kenneth Graunke <kenneth.w.graunke at intel.com>
Cc: Art Runyan <arthur.j.runyan at intel.com>
Reported-by: "Kumar, Kiran S" <kiran.s.kumar at intel.com>
Cc: stable at vger.kernel.org [v3.13+]
Signed-off-by: Ben Widawsky <ben at bwidawsk.net>
Signed-off-by: Jani Nikula <jani.nikula at intel.com>
:040000 040000 af3b065bcd133817f46c1c1e6328db8cc1767095
c7b6f61027f166bb5a712201a2bd2d3997adac6e M drivers
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