dix/dispatch.c:4049: AttachOffloadGPU: Assertion `new->current_master == pScreen' failed.

[Michel Dänzer]

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 monitor’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.
>>
>> ```
>> […]
>> (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 doesn’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