From mboxrd@z Thu Jan 1 00:00:00 1970 From: bugzilla-daemon@freedesktop.org Subject: [Bug 101593] Display errors with a R9 290x and a resolution of 3840x2160 Date: Mon, 26 Jun 2017 07:59:42 +0000 Message-ID: Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============0646134406==" 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 029C36E1CF for ; Mon, 26 Jun 2017 07:59:42 +0000 (UTC) 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 --===============0646134406== Content-Type: multipart/alternative; boundary="14984639810.d90C77.19995"; charset="UTF-8" --14984639810.d90C77.19995 Date: Mon, 26 Jun 2017 07:59:41 +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=3D101593 Bug ID: 101593 Summary: Display errors with a R9 290x and a resolution of 3840x2160 Product: DRI Version: unspecified Hardware: x86-64 (AMD64) OS: Linux (All) Status: NEW Severity: normal Priority: medium Component: DRM/Radeon Assignee: dri-devel@lists.freedesktop.org Reporter: tardingens@googlemail.com Using the radeon driver with an AMD R9 290x and a 4k monitor causes display corruption when set to the native resolution. The problem was introduced with this change: drm/radeon: change vblank_times calculation method to reduce computational error. https://patchwork.kernel.org/patch/9403897/ The issue is very easy to see when the mclk speed is forced to low, but it occurs in normal usage too. Before the patch mclk switching was disabled at= 4k and the bug was not there. The Windows driver has no such problems and does fine, even with mclk switching. --=20 You are receiving this mail because: You are the assignee for the bug.= --14984639810.d90C77.19995 Date: Mon, 26 Jun 2017 07:59:41 +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
Bug ID 101593
Summary Display errors with a R9 290x and a resolution of 3840x2160
Product DRI
Version unspecified
Hardware x86-64 (AMD64)
OS Linux (All)
Status NEW
Severity normal
Priority medium
Component DRM/Radeon
Assignee dri-devel@lists.freedesktop.org
Reporter tardingens@googlemail.com 

Using the radeon driver with an AMD R9 290x and a 4k monitor c=
auses display
corruption when set to the native resolution.

The problem was introduced with this change:
drm/radeon: change vblank_times calculation method to reduce computational
error.
https://patchwork.k=
ernel.org/patch/9403897/

The issue is very easy to see when the mclk speed is forced to low, but it
occurs in normal usage too. Before the patch mclk switching was disabled at=
 4k
and the bug was not there.

The Windows driver has no such problems and does fine, even with mclk
switching.

You are receiving this mail because:
  • You are the assignee for the bug.
= --14984639810.d90C77.19995-- --===============0646134406== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: base64 Content-Disposition: inline X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KZHJpLWRldmVs IG1haWxpbmcgbGlzdApkcmktZGV2ZWxAbGlzdHMuZnJlZWRlc2t0b3Aub3JnCmh0dHBzOi8vbGlz dHMuZnJlZWRlc2t0b3Aub3JnL21haWxtYW4vbGlzdGluZm8vZHJpLWRldmVsCg== --===============0646134406==--