4.0-rc6 i915 errors

4.0-rc6 i915 errors

[Pali Rohár]

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Hello,

every time when booting 4.0-rc6 kernel I see those error messages in dmesg log:

[    1.836306] [drm:hsw_unclaimed_reg_detect.isra.10 [i915]] *ERROR* Unclaimed register detected. Please use the i915.mmio_debug=1 to debug this problem.
[    1.836306] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt
[    1.839551] [drm:hsw_unclaimed_reg_detect.isra.10 [i915]] *ERROR* Unclaimed register detected. Please use the i915.mmio_debug=1 to debug this problem.
[    1.839573] [drm:hsw_unclaimed_reg_detect.isra.10 [i915]] *ERROR* Unclaimed register detected. Please use the i915.mmio_debug=1 to debug this problem.
[    1.839573] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt
[    1.839602] [drm:hsw_unclaimed_reg_detect.isra.10 [i915]] *ERROR* Unclaimed register detected. Please use the i915.mmio_debug=1 to debug this problem.
[    1.839642] [drm:hsw_unclaimed_reg_detect.isra.10 [i915]] *ERROR* Unclaimed register detected. Please use the i915.mmio_debug=1 to debug this problem.
[    1.839658] [drm:hsw_unclaimed_reg_detect.isra.10 [i915]] *ERROR* Unclaimed register detected. Please use the i915.mmio_debug=1 to debug this problem.
[    1.839658] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt
[    1.839679] [drm:hsw_unclaimed_reg_detect.isra.10 [i915]] *ERROR* Unclaimed register detected. Please use the i915.mmio_debug=1 to debug this problem.
[    1.839695] [drm:hsw_unclaimed_reg_detect.isra.10 [i915]] *ERROR* Unclaimed register detected. Please use the i915.mmio_debug=1 to debug this problem.
[    1.839710] [drm:hsw_unclaimed_reg_detect.isra.10 [i915]] *ERROR* Unclaimed register detected. Please use the i915.mmio_debug=1 to debug this problem.
[    1.839762] [drm:hsw_unclaimed_reg_detect.isra.10 [i915]] *ERROR* Unclaimed register detected. Please use the i915.mmio_debug=1 to debug this problem.
[    1.839778] [drm:hsw_unclaimed_reg_detect.isra.10 [i915]] *ERROR* Unclaimed register detected. Please use the i915.mmio_debug=1 to debug this problem.
[    1.839778] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt
[    1.839805] [drm:hsw_unclaimed_reg_detect.isra.10 [i915]] *ERROR* Unclaimed register detected. Please use the i915.mmio_debug=1 to debug this problem.
[    1.839848] [drm:hsw_unclaimed_reg_detect.isra.10 [i915]] *ERROR* Unclaimed register detected. Please use the i915.mmio_debug=1 to debug this problem.
[    1.839861] [drm:hsw_unclaimed_reg_detect.isra.10 [i915]] *ERROR* Unclaimed register detected. Please use the i915.mmio_debug=1 to debug this problem.
[    1.839861] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt
[    1.839885] [drm:hsw_unclaimed_reg_detect.isra.10 [i915]] *ERROR* Unclaimed register detected. Please use the i915.mmio_debug=1 to debug this problem.
[    1.839904] [drm:hsw_unclaimed_reg_detect.isra.10 [i915]] *ERROR* Unclaimed register detected. Please use the i915.mmio_debug=1 to debug this problem.
[    1.839923] [drm:hsw_unclaimed_reg_detect.isra.10 [i915]] *ERROR* Unclaimed register detected. Please use the i915.mmio_debug=1 to debug this problem.
[    1.839929] [drm:hsw_unclaimed_reg_detect.isra.10 [i915]] *ERROR* Unclaimed register detected. Please use the i915.mmio_debug=1 to debug this problem.
[    1.839930] Console: switching to colour frame buffer device 200x56
[    1.839965] [drm:hsw_unclaimed_reg_detect.isra.10 [i915]] *ERROR* Unclaimed register detected. Please use the i915.mmio_debug=1 to debug this problem.
[    1.839966] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt
[    1.839989] [drm:hsw_unclaimed_reg_detect.isra.10 [i915]] *ERROR* Unclaimed register detected. Please use the i915.mmio_debug=1 to debug this problem.
[    1.843095] [drm:hsw_unclaimed_reg_detect.isra.10 [i915]] *ERROR* Unclaimed register detected. Please use the i915.mmio_debug=1 to debug this problem.

lspci show card as:
00:02.0 VGA compatible controller [0300]: Intel Corporation 4th Gen Core Processor Integrated Graphics Controller [8086:0416] (rev 06)

Do you know what it means? What are those errors?

And every time when I open LID of my notebook i915 driver write lot of messages to dmesg:

[   62.015885] i915 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment
[   62.016395] i915 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment
[   62.016486] i915 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment
[   62.016520] i915 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment
[   62.016551] i915 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment
[   62.016725] i915 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment
[   62.016740] i915 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment
[   62.025001] i915 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment
[   62.025070] i915 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment
[   62.025206] i915 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment

(closing LID do nothing - no suspend or hibernate action)

Problem with those messages when opening LID I already reported to bug:
https://bugzilla.kernel.org/show_bug.cgi?id=85311#c9

-- 
Pali Rohár
pali.rohar@gmail.com

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