[Intel-gfx] BUG: i915: flickering/temporary artifacts after resume

[Saarinen, Jani]

Hi Russell,
Can you make new gitlab: https://gitlab.freedesktop.org/drm/intel/-/wikis/How-to-file-i915-bugs  ? 

Br,
Jani

> -----Original Message-----
> From: Intel-gfx <intel-gfx-bounces at lists.freedesktop.org> On Behalf Of Russell
> King (Oracle)
> Sent: lauantai 5. marraskuuta 2022 17.17
> To: Jani Nikula <jani.nikula at linux.intel.com>; Joonas Lahtinen
> <joonas.lahtinen at linux.intel.com>; Vivi, Rodrigo <rodrigo.vivi at intel.com>;
> Tvrtko Ursulin <tvrtko.ursulin at linux.intel.com>
> Cc: intel-gfx at lists.freedesktop.org
> Subject: [Intel-gfx] BUG: i915: flickering/temporary artifacts after resume
> 
> Hi,
> 
> I have a HP Pavilion 15" laptop that occasionally misbehaves after a resume from
> suspend mode. The problem is obvious when the screen updates e.g. after
> moving the mouse and the window focus changing, or when a terminal scrolls, I
> get a ficker of random short horizontal white lines over the top of the windows
> that then disappear. These appear to be predominantly focused towards the top
> of the screen, although they do also occur lower down but less obviously.
> 
> Soemtimes these artifacts don't disappear until the next update - I attempted to
> capture them, but of course that provokes another screen update and they
> disappear.
> 
> When this problem occurs, suspending and resuming again doesn't appear to fix
> the issue - only a reboot does.
> 
> Environment:
> 
> 00:02.0 VGA compatible controller: Intel Corporation HD Graphics 620 (rev 02)
> (prog-if 00 [VGA controller])
>         DeviceName: Intel Kabylake HD Graphics ULT GT2
>         Subsystem: Hewlett-Packard Company HD Graphics 620
>         Flags: bus master, fast devsel, latency 0, IRQ 130, IOMMU group 1
>         Memory at a0000000 (64-bit, non-prefetchable) [size=16M]
>         Memory at 90000000 (64-bit, prefetchable) [size=256M]
>         I/O ports at 4000 [size=64]
>         Expansion ROM at 000c0000 [virtual] [disabled] [size=128K]
>         Capabilities: [40] Vendor Specific Information: Len=0c <?>
>         Capabilities: [70] Express Root Complex Integrated Endpoint, MSI 00
>         Capabilities: [ac] MSI: Enable+ Count=1/1 Maskable- 64bit-
>         Capabilities: [d0] Power Management version 2
>         Capabilities: [100] Process Address Space ID (PASID)
>         Capabilities: [200] Address Translation Service (ATS)
>         Capabilities: [300] Page Request Interface (PRI)
>         Kernel driver in use: i915
>         Kernel modules: i915
> 
> Debian Bullseye (stable), Xorg 1.20.11, libdrm 2.4.104, intel xorg driver
> 2.99.917+git20200714.
> 
> Kernel messages related to DRM:
> 
> Linux version 5.10.0-19-amd64 (debian-kernel at lists.debian.org) (gcc-10 (Debian 1
> 0.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2) #1 SMP Debian
>  5.10.149-1 (2022-10-17)
> ...
> i915 0000:00:02.0: [drm] VT-d active for gfx access checking generic (90000000
> 408000) vs hw (a0000000 1000000) checking generic (90000000 408000) vs hw
> (90000000 10000000)
> fb0: switching to inteldrmfb from EFI VGA
> Console: switching to colour dummy device 80x25
> i915 0000:00:02.0: vgaarb: deactivate vga console
> i915 0000:00:02.0: vgaarb: changed VGA decodes:
> olddecodes=io+mem,decodes=io+mem:owns=io+mem
> i915 0000:00:02.0: firmware: direct-loading firmware i915/kbl_dmc_ver1_04.bin
> i915 0000:00:02.0: [drm] Finished loading DMC firmware
> i915/kbl_dmc_ver1_04.bin (v1.4) [drm] Initialized i915 1.6.0 20200917 for
> 0000:00:02.0 on minor 0
> ACPI: Video Device [GFX0] (multi-head: yes  rom: no  post: no)
> input: Video Bus as
> /devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/LNXVIDEO:00/input/input6
> fbcon: i915drmfb (fb0) is primary device
> Console: switching to colour frame buffer device 170x48
> i915 0000:00:02.0: [drm] fb0: i915drmfb frame buffer device mei_hdcp
> 0000:00:16.0-b638ab7e-94e2-4ea2-a552-d1c54b627f04: bound 0000:00:02.0 (ops
> i915_hdcp_component_ops [i915]) snd_hda_intel 0000:00:1f.3: bound
> 0000:00:02.0 (ops i915_audio_component_bind_ops [i915]) (NULL device *):
> firmware: direct-loading firmware i915/kbl_dmc_ver1_04.bin mei_hdcp
> 0000:00:16.0-b638ab7e-94e2-4ea2-a552-d1c54b627f04: bound 0000:00:02.0 ( ops
> i915_hdcp_component_ops [i915])
> 
> The last two lines repeat each time the system is suspended/resumed.
> 
> No errors or warnings appear to be logged either from the kernel nor in the Xorg
> log file specific to i915 (there's the usual Xorg whinging about the system being
> too slow... so an i5-7200U 2.5GHz isn't fast enough for Xorg!)
> 
> It feels like some setting within the Intel GPU hardware that controls memory
> access timing isn't being properly restored.
> 
> Is this a known issue?
> 
> Thanks.
> 
> Russell.
> 
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