From mboxrd@z Thu Jan 1 00:00:00 1970 From: bugzilla-daemon@freedesktop.org Subject: [Bug 67970] Kernel bugs related to the powersaving features of mobility radeon x1400 Date: Thu, 20 Oct 2016 22:48:58 +0000 Message-ID: References: Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============2117907935==" Return-path: Received: from culpepper.freedesktop.org (culpepper.freedesktop.org [IPv6:2610:10:20:722:a800:ff:fe98:4b55]) by gabe.freedesktop.org (Postfix) with ESMTP id 985D76E420 for ; Thu, 20 Oct 2016 22:48:58 +0000 (UTC) In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" To: dri-devel@lists.freedesktop.org List-Id: dri-devel@lists.freedesktop.org --===============2117907935== Content-Type: multipart/alternative; boundary="14770037382.dEbD438E.27551"; charset="UTF-8" --14770037382.dEbD438E.27551 Date: Thu, 20 Oct 2016 22:48:58 +0000 MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: http://bugs.freedesktop.org/ Auto-Submitted: auto-generated https://bugs.freedesktop.org/show_bug.cgi?id=3D67970 --- Comment #1 from Boris Gjenero --- I've seen the same things on my Inspiron 6400 with Radeon X1400 graphics, running 64-bit Ubuntu 16.10 with kernel 4.8.0-26-generic. Though while play= ing with it I saw some variations in behaviour. Sometimes in dynpm, reported frequencies were from the last profile that was used. Sometimes, changing a profile had no effect. Using vblank_mode=3D0 glxgears, Chrome and Firefox I= am unable to see a performance difference between low and mid. There is a very definite difference between those and high profile. Performance of dynpm and high profile is identical or very close. Playing with these settings can introduce instability. After switching among profiles, going back to dynpm usually causes brief bright flashes of the screen. Those flashes never happen after setting dynpm in /etc/rc.local. Al= so, changing to high profile caused a total hang once, where even Magic SysRq didn't help. Yes, I also see NMIs switching to low, but those seem to have = no ill effect. --=20 You are receiving this mail because: You are the assignee for the bug.= --14770037382.dEbD438E.27551 Date: Thu, 20 Oct 2016 22:48:58 +0000 MIME-Version: 1.0 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: http://bugs.freedesktop.org/ Auto-Submitted: auto-generated

Comment= # 1 on bug 67970<= /a> from Boris Gjenero 
I've seen the same things on my Inspiron 6400 with Radeon X140=
0 graphics,
running 64-bit Ubuntu 16.10 with kernel 4.8.0-26-generic. Though while play=
ing
with it I saw some variations in behaviour. Sometimes in dynpm, reported
frequencies were from the last profile that was used. Sometimes, changing a
profile had no effect. Using vblank_mode=3D0 glxgears, Chrome and Firefox I=
 am
unable to see a performance difference between low and mid. There is a very
definite difference between those and high profile. Performance of dynpm and
high profile is identical or very close.

Playing with these settings can introduce instability. After switching among
profiles, going back to dynpm usually causes brief bright flashes of the
screen. Those flashes never happen after setting dynpm in /etc/rc.local. Al=
so,
changing to high profile caused a total hang once, where even Magic SysRq
didn't help. Yes, I also see NMIs switching to low, but those seem to have =
no
ill effect.

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