https://bugs.freedesktop.org/show_bug.cgi?id=95298
Bug ID: 95298 Summary: Can't "connect" to external display attached to docking station via DP on laptop with Intel/AMD dual Product: DRI Version: XOrg git Hardware: x86-64 (AMD64) OS: Linux (All) Status: NEW Severity: normal Priority: medium Component: DRM/Radeon Assignee: dri-devel@lists.freedesktop.org Reporter: debian@onerussian.com
Created attachment 123520 --> https://bugs.freedesktop.org/attachment.cgi?id=123520&action=edit entire dmesg from the boot #1
I have HP zbook 14 and using Debian testing/unstable. External monitor is connected to docking station serving two DP connections. To make those visible to xrandr I do
xrandr --setprovideroffloadsink 1 0 xrandr --setprovideroutputsource 1 0
where 0 corresponds to Intel, 1 to Radeon/OLAND (name changed when upgraded). Setup was working with stock debian packages (kernel was 4.4.2-3) for awhile but there was an issue that display didn't refresh correctly and often I had blank patches and had to go to gnome overview and back to re-render. So I have decided to upgrade to a current state of testing + some unstable. Currently have xserver-xorg-core 2:1.18.3-1 xserver-xorg-video-ati 1:7.7.0-1 and kernel 4.5.1-1 . Unfortunately I can't "turn on" the external display connected to the docking station -- screen blinks and comes back to display on the laptop, xrandr reports xrandr: Configure crtc 4 failed and agd5f on IRC looking at http://www.onerussian.com/tmp/dmesg-20160506-1.txt (attached to this report as well) summarized as "link training failed on the display"