From mboxrd@z Thu Jan 1 00:00:00 1970 From: bugzilla-daemon@freedesktop.org Subject: [Bug 104248] Black screen after switching refresh rate from 144 Hz Date: Wed, 13 Dec 2017 19:26:07 +0000 Message-ID: Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============0346312147==" 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 D96646E581 for ; Wed, 13 Dec 2017 19:26:06 +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 --===============0346312147== Content-Type: multipart/alternative; boundary="15131931660.478c.5247"; charset="UTF-8" --15131931660.478c.5247 Date: Wed, 13 Dec 2017 19:26:06 +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=3D104248 Bug ID: 104248 Summary: Black screen after switching refresh rate from 144 Hz Product: DRI Version: XOrg git Hardware: x86-64 (AMD64) OS: Linux (All) Status: NEW Severity: normal Priority: medium Component: DRM/AMDgpu Assignee: dri-devel@lists.freedesktop.org Reporter: thomas-lange2@gmx.de Created attachment 136148 --> https://bugs.freedesktop.org/attachment.cgi?id=3D136148&action=3Dedit Output of dmesg My monitor supports 144 Hz as refresh rate which works fine. But switching = from 144 Hz to a lower value (like 120 Hz) always results in a black screen with= no signal. The intention is to use 144 Hz for games and 120 Hz on the desktop. PowerPl= ay doesn't work with 144 Hz, so the GPU wastes energy and gets hotter than necessary. Switching between other rates (like 120 -> 60 -> 100 -> 60 -> 120) works fi= ne. It also worked correctly with previous cards (HD4830 and HD6850). The workaround is to stay on 120 Hz all the time. When the screen shows no signal, resuming from standby brings it back. Things I have tried so far: 1. Disabling DPM with "echo high > /sys/class/drm/card0/device/power_profil= e" -> Same results 2. Using Linux 4.15-RC3 with enabled DC (amdgpu.dc=3D1) -> Refresh rates higher than 60 Hz are not supported -> Is this known or should I file a separate bug report? Hardware: PowerColor RX 560 (POLARIS 11) LG Electronics 24GM77-B, connected via DVI cable Software: Linux 4.14.5 x86_64 Mesa 17.2.6 Xorg 1.19.5 xf86-video-amdgpu 1.4.0 --=20 You are receiving this mail because: You are the assignee for the bug.= --15131931660.478c.5247 Date: Wed, 13 Dec 2017 19:26:06 +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 104248
Summary Black screen after switching refresh rate from 144 Hz
Product DRI
Version XOrg git
Hardware x86-64 (AMD64)
OS Linux (All)
Status NEW
Severity normal
Priority medium
Component DRM/AMDgpu
Assignee dri-devel@lists.freedesktop.org
Reporter thomas-lange2@gmx.de 

Created attachment 136148 [details]
Output of dmesg

My monitor supports 144 Hz as refresh rate which works fine. But switching =
from
144 Hz to a lower value (like 120 Hz) always results in a black screen with=
 no
signal.

The intention is to use 144 Hz for games and 120 Hz on the desktop. PowerPl=
ay
doesn't work with 144 Hz, so the GPU wastes energy and gets hotter than
necessary.

Switching between other rates (like 120 -> 60 -> 100 -> 60 -> 1=
20) works fine.
It also worked correctly with previous cards (HD4830 and HD6850).

The workaround is to stay on 120 Hz all the time. When the screen shows no
signal, resuming from standby brings it back.

Things I have tried so far:
1. Disabling DPM with "echo high > /sys/class/drm/card0/device/powe=
r_profile"
-> Same results

2. Using Linux 4.15-RC3 with enabled DC (amdgpu.dc=3D1)
-> Refresh rates higher than 60 Hz are not supported
-> Is this known or should I file a separate bug report?

Hardware:
PowerColor RX 560 (POLARIS 11)
LG Electronics 24GM77-B, connected via DVI cable

Software:
Linux 4.14.5 x86_64
Mesa 17.2.6
Xorg 1.19.5
xf86-video-amdgpu 1.4.0

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