[Bug 89360] [bdw-u iommu] DMAR error -> GPU hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89360

--- Comment #117 from Toroid at gmx.at ---
Hello, 

i have 

 description: Notebook
    product: LIFEBOOK E8420
    vendor: FUJITSU SIEMENS
    version: E84__
    width: 32 bits
    capabilities: smbios-2.4 dmi-2.4

with 

00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset
Integrated Graphics Controller (rev 07) (prog-if 00 [VGA controller])
        Subsystem: Fujitsu Limited. Mobile 4 Series Chipset Integrated Graphics
Controller
        Flags: bus master, fast devsel, latency 0, IRQ 16
        Memory at f2000000 (64-bit, non-prefetchable) [size=4M]
        Memory at d0000000 (64-bit, prefetchable) [size=256M]
        I/O ports at 1800 [size=8]
        [virtual] Expansion ROM at 000c0000 [disabled] [size=128K]
        Capabilities: <access denied>
        Kernel driver in use: i915
        Kernel modules: i915

00:02.1 Display controller: Intel Corporation Mobile 4 Series Chipset
Integrated Graphics Controller (rev 07)
        Subsystem: Fujitsu Limited. Mobile 4 Series Chipset Integrated Graphics
Controller
        Flags: bus master, fast devsel, latency 0
        Memory at f2400000 (64-bit, non-prefetchable) [size=1M]
        Capabilities: <access denied>


running 

4.15.0-54-generic #58-Ubuntu SMP Mon Jun 24 10:55:12 UTC 2019 i686 i686 i686
GNU/Linux

My System turns reproducable into a piece of brick every 2nd boot when
switching to inteldrmfb from VESA ?VGA? or so. 
Sometimes the CLI Screen gets a bit cluttered or blacks out or just heats up
the room. 

I also noticed: 
KiCAD schematics gets cluttered with mousecross until refresh. 
I can not use a secondary display by hdmi and xrandr. 

I tried to find some loggings but since it happens during bootup i did not find
anything to investigate further details. 

If i can support to investigate / fix the annoying shit please let me know what
/ how to do as i really would like to use my big stationary screen for cad.   

Sincerely Reiner

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