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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #118 from Lakshmi <lakshminarayana.vudum at intel.com> ---
(In reply to Toroid from comment #117)
> 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

Hi, This looks like a different issue than the original bug report. Can you
please verify the issue with drmtip (https://cgit.freedesktop.org/drm-tip).
If the problem persists create a new bug and and attach dmesg log from boot
with kernel parameter drm.debug=0x1e log_buf_len=4M.

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