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

["Russell King (Oracle)" <linux@armlinux.org.uk>]

On Mon, Nov 07, 2022 at 09:29:33AM +0000, Saarinen, Jani wrote:
> Hi Russell,
> Can you make new gitlab: https://gitlab.freedesktop.org/drm/intel/-/wikis/How-to-file-i915-bugs  ? 

Hi,

Unfortunately, I can't get any more information, and trying to get a
photo of the problem is utterly impossible, beacuse it's almost always
a momentary corruption - out of all the cases, I have only seen it
remain on-screen once.

Also, it can take months of suspend/resume cycles for it to occur,
which makes it difficult to reproduce using the "latest" kernel -
beacuse by the time the latest kernel has shown the problem, there's
a more modern kernel!

Using the intel reg dumper may provide some useful information.

That said, running it from the debian stable repository gives me:

(intel_reg:338236) intel_mmio-CRITICAL: Test assertion failure function
intel_mmio_use_pci_bar, file ../lib/intel_mmio.c:146:
(intel_reg:338236) intel_mmio-CRITICAL: Failed assertion: !(error != 0)
(intel_reg:338236) intel_mmio-CRITICAL: Last errno: 1, Operation not
permitted
(intel_reg:338236) intel_mmio-CRITICAL: Couldn't map MMIO region
Test (null) failed.
**** DEBUG ****
(intel_reg:338236) intel_chipset-DEBUG: Test requirement passed: pci_dev
(intel_reg:338236) intel_mmio-CRITICAL: Test assertion failure function
intel_mmio_use_pci_bar, file ../lib/intel_mmio.c:146:
(intel_reg:338236) intel_mmio-CRITICAL: Failed assertion: !(error != 0)
(intel_reg:338236) intel_mmio-CRITICAL: Last errno: 1, Operation not
permitted
(intel_reg:338236) intel_mmio-CRITICAL: Couldn't map MMIO region
(intel_reg:338236) igt_core-INFO: Stack trace:
(intel_reg:338236) igt_core-INFO:   #0 [__igt_fail_assert+0x113]
(intel_reg:338236) igt_core-INFO:   #1 [intel_mmio_use_pci_bar+0xc4]
(intel_reg:338236) igt_core-INFO:   #2 [intel_register_access_init+0x1b]
(intel_reg:338236) igt_core-INFO:   #3 [<unknown>+0xec025c3a]
(intel_reg:338236) igt_core-INFO:   #4 [<unknown>+0xec0246f6]
(intel_reg:338236) igt_core-INFO:   #5 [__libc_start_main+0xea]
(intel_reg:338236) igt_core-INFO:   #6 [<unknown>+0xec0247ba]
****  END  ****

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