From mboxrd@z Thu Jan 1 00:00:00 1970 From: bugzilla-daemon@freedesktop.org Subject: [Bug 73067] RV770 - screen flicker with radeon.dpm=1 Date: Thu, 16 Jan 2014 17:15:49 +0000 Message-ID: References: Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============1818610701==" Return-path: Received: from culpepper.freedesktop.org (unknown [131.252.210.165]) by gabe.freedesktop.org (Postfix) with ESMTP id E11D3106DCA for ; Thu, 16 Jan 2014 09:15:48 -0800 (PST) In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dri-devel-bounces@lists.freedesktop.org Errors-To: dri-devel-bounces@lists.freedesktop.org To: dri-devel@lists.freedesktop.org List-Id: dri-devel@lists.freedesktop.org --===============1818610701== Content-Type: multipart/alternative; boundary="1389892548.ff5A1.23086"; charset="us-ascii" --1389892548.ff5A1.23086 Date: Thu, 16 Jan 2014 17:15:48 +0000 MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" https://bugs.freedesktop.org/show_bug.cgi?id=73067 --- Comment #10 from Alex Deucher --- (In reply to comment #9) > Yes, the attached patch fixed the flicker. Screen does not flick whichever > value is power_dpm_state or power_dpm_force_performance_level. > > Before the patch, the flicker happened when switching from > power level 2 sclk: 66500 mclk: 95000 vddc: 1082 > to > power level 1 sclk: 50000 mclk: 70000 vddc: 1046 > > In the way level 1 -> level 2 there is not screen flicker. The flicker is caused by the mclk transition. It some cases it seems to take longer than the vblank period which is why you are seeing the flicker. -- You are receiving this mail because: You are the assignee for the bug. --1389892548.ff5A1.23086 Date: Thu, 16 Jan 2014 17:15:48 +0000 MIME-Version: 1.0 Content-Type: text/html; charset="UTF-8"

Comment # 10 on bug 73067 from 
(In reply to comment #9)
> Yes, the attached patch fixed the flicker. Screen does not flick whichever
> value is power_dpm_state or power_dpm_force_performance_level.
> 
> Before the patch, the flicker happened when switching from
> power level 2    sclk: 66500 mclk: 95000 vddc: 1082
> to
> power level 1    sclk: 50000 mclk: 70000 vddc: 1046
> 
> In the way level 1 -> level 2 there is not screen flicker.

The flicker is caused by the mclk transition.  It some cases it seems to take
longer than the vblank period which is why you are seeing the flicker.

You are receiving this mail because:
  • You are the assignee for the bug.
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