Dear Michel, Thank you for your reply. On 08/14/17 03:15, Michel Dänzer wrote: > On 11/08/17 01:02 AM, Paul Menzel wrote: >> 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. Do you know why the stack trace is not present in the X server log? I was able to get a stack trace as root and with GDB. Issue #102222 (dix/dispatch.c:4049: AttachOffloadGPU: Assertion `new->current_master == pScreen' failed.) tracks this problem now, and the stack traces are attached there. Kind regards, Paul [1] https://bugs.freedesktop.org/show_bug.cgi?id=102222
