[Bug 94985] New: [HSW] Severe screen flickering on external monitor after i915.enable_psr=1
bugzilla-daemon at freedesktop.org
bugzilla-daemon at freedesktop.org
Mon Apr 18 05:48:07 UTC 2016
https://bugs.freedesktop.org/show_bug.cgi?id=94985
Bug ID: 94985
Summary: [HSW] Severe screen flickering on external monitor
after i915.enable_psr=1
Product: DRI
Version: XOrg git
Hardware: x86-64 (AMD64)
OS: Linux (All)
Status: NEW
Severity: normal
Priority: medium
Component: DRM/Intel
Assignee: intel-gfx-bugs at lists.freedesktop.org
Reporter: pinguin255 at gmail.com
QA Contact: intel-gfx-bugs at lists.freedesktop.org
CC: intel-gfx-bugs at lists.freedesktop.org
Created attachment 123021
--> https://bugs.freedesktop.org/attachment.cgi?id=123021&action=edit
dmesg
Kernel: 4.6.0-040600rc3-generic
Architecture: x86_64
Distribution: Ubuntu 14.04 trusty
Machine: Thinkpad T440p
Connector: VGA
I was trying to find a way for my Haswell system (Thinkpad T440p, 20AN0034RT,
i5-4300M) to enter deeper power-saving package states (below pc3) and it turned
out, that after following actions system indeed goes to pc7:
1. Setting i915.enable_psr=1
2. Setting SATA link_power_management_policy to min_power
But immediately after applying these settings the problem occurs. External VGA
monitor is no longer usable, as it starts flickering constantly every second
during idling. However, when some activity occurs (video playback or some CPU
intensive task, for example) flickering stops. Main screen screen is flickering
too, but not so hard and is effectively usable as it just becomes black only
for a fraction of second and rarely. As in 4.6 PSR is planned to be set enabled
by default I decided to report this.
--
You are receiving this mail because:
You are the assignee for the bug.
You are on the CC list for the bug.
You are the QA Contact for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/intel-gfx-bugs/attachments/20160418/15b208d3/attachment-0001.html>
More information about the intel-gfx-bugs
mailing list