On 11/08/17 01:02 AM, Paul Menzel wrote: > Dear Linux folks, > > > On 08/10/17 15:14, Paul Menzel wrote: > >> Getting Dell Precision 3620 systems with an Intel Skylake system >> i7-6700K, and an external AMD graphics card, the X.Org server does not >> start and hits an assert. The software stack is Linux 4.9.38 and >> 4.12.5, X.Org server 1.19.3 and xf86-video-amdgpu 1.3.0. >> >> ``` >> $ lspci -nn -s 00:01.0 >> 00:01.0 PCI bridge [0604]: Intel Corporation Skylake PCIe Controller >> (x16) [8086:1901] (rev 07) >> $ lspci -nn -s 1:00.0 >> 01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. >> [AMD/ATI] Bonaire [FirePro W5100] [1002:6649] >> ``` >> >> The monitorâ??s DVI cable and a DVI-to-DP adapter is plugged into the >> DisplayPort port of the AMD graphics card. The TTY login screen can be >> shortly seen before GDM tries to start. >> >> Please find the last X.Org server messages below. >> >> ``` >> [â?¦] >> (II) Loading /usr/lib/xorg/modules/libfb.so >> (II) Module fb: vendor="X.Org Foundation" >> compiled for 1.19.3, module version = 1.0.0 >> (--) Depth 24 pixmap format is 32 bpp >> (==) modeset(G0): Backing store enabled >> (==) modeset(G0): Silken mouse enabled >> (II) modeset(G0): RandR 1.2 enabled, ignore the following RandR >> disabled message. >> (==) modeset(G0): DPMS enabled >> (II) modeset(G0): [DRI2] Setup complete >> (II) modeset(G0): [DRI2] DRI driver: i965 >> (II) modeset(G0): [DRI2] VDPAU driver: i965 >> (II) AMDGPU(0): [DRI2] Setup complete >> (II) AMDGPU(0): [DRI2] DRI driver: radeonsi >> (II) AMDGPU(0): [DRI2] VDPAU driver: radeonsi >> (II) AMDGPU(0): Front buffer pitch: 6912 bytes >> (II) AMDGPU(0): SYNC extension fences enabled >> (II) AMDGPU(0): Present extension enabled >> (==) AMDGPU(0): DRI3 enabled >> (==) AMDGPU(0): Backing store enabled >> (II) AMDGPU(0): Direct rendering enabled >> (II) AMDGPU(0): Use GLAMOR acceleration. >> (II) AMDGPU(0): Acceleration enabled >> (==) AMDGPU(0): DPMS enabled >> (==) AMDGPU(0): Silken mouse enabled >> (II) AMDGPU(0): Set up textured video (glamor) >> (II) AMDGPU(0): RandR 1.2 enabled, ignore the following RandR disabled >> message. >> (--) RandR disabled >> Xorg: >> /dev/shm/bee-root/xorg-server/xorg-server-1.19.3-0/source/dix/dispatch.c:4049: >> AttachOffloadGPU: Assertion `new->current_master == pScreen' failed. >> ``` >> >> The USB keyboard does not work, and the system has to be controlled >> remotely over SSH. Plugging in the DisplayPort cable into the internal >> Intel graphics ports the Linux messages can be seen, but nothing else >> works. Stopping GDM does not bring back the TTY screen. The keyboard >> still does work. Plugging the USB cable out and back in doesnâ??t fix it >> either. >> >> Trying to disable the internal Intel graphics card, did not fix the >> problem either. > > Blacklisting the module *i915* works around the problem. > > Please tell me if you want me to create a bug report for this issue, > and, if yes, what part in the graphics stack this problem belongs to. It's hard to be sure without seeing a backtrace of the assertion failure, but I'd say start at https://bugs.freedesktop.org/enter_bug.cgi?product=xorg&component=Server/Ext/RandR . -- Earthling Michel Dänzer | http://www.amd.com Libre software enthusiast | Mesa and X developer
