From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon@freedesktop.org
Subject: [Bug 89155] Dual monitor setup does not initialize
Date: Sun, 15 Feb 2015 13:53:52 +0000
Message-ID:
Bug ID
89155
Summary
Dual monitor setup does not initialize
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
adam.reichold@t-online.de
Created attachment 113508 [details]
journalctl -b | grep "\[drm"
I am running Arch Linux on an AMD A6-3500 with Radeon HD 6530D graphics on an
Gigabyte A55M-S2V mainboard. I just received updated X server to version 1.17.1
together with a rebuilt version 7.5.0 of the XFree86 ATI driver with the kernel
staying at 3.18.6.
I do have two Samsung monitors connected to the system, one via DVI and one via
VGA. This setup always initialized unreliably and I had to manually add modes
for the VGA-connected monitor using
xrandr --newmode "1680x1050_60.00" 146.25 1680 1784 1960 2240 1050 1053 1059
1089 -hsync +vsync
xrandr --addmode VGA-0 "1680x1050_60.00"
xrandr --output VGA-0 --mode "1680x1050_60.00"
for it to work at all. But after the update described above, the two monitors
never initialize properly anymore. Before the update, I sometimes had to
power-cycle (meaning switch off power not just a reboot) but it did eventually
work after two or three tries.
The reason I am reporting this as a Radeon DRM issue instead of an X server
problem is that my system log contains errors from the DRM driver about
"channel eq" and "clock recovery". I attached those logs grepped for "[drm".
Thank for your help and please tell me if I can provide any further information
to help diagnose this.