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. Kind regards, Paul
