https://bugzilla.kernel.org/show_bug.cgi?id=176311
Bug ID: 176311 Summary: Fiji DisplayPort amdgpu_crtc_page_flip *ERROR* failed to get vblank before flip Product: Drivers Version: 2.5 Kernel Version: 4.7.5-200.fc24.x86_64 Hardware: All OS: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: Video(DRI - non Intel) Assignee: drivers_video-dri@kernel-bugs.osdl.org Reporter: vedran@miletic.net Regression: No
As said in bug 176301, I have a Fiji card
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Fiji [Radeon R9 FURY / NANO Series] (rev ca)
with two LG DisplayPort 27" 4K monitors. Locking screen while GNOME is running on X makes both monitors go to sleep, all fine. Upon moving a mouse or pressing a key, only one of them will wake up, and always the same one. Dmesg shows:
[drm:amdgpu_crtc_page_flip [amdgpu]] *ERROR* failed to get vblank before flip
The other monitor will wake up if one switches to a console (e.g. Ctrl+Alt+F3) and back or one powers any of the monitors off and back on.