[Bug 107067] New: vblank wait timed out on Skylake

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107067

            Bug ID: 107067
           Summary: vblank wait timed out on Skylake
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: harn-solo at gmx.de
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 140385
  --> https://bugs.freedesktop.org/attachment.cgi?id=140385&action=edit
Backtrace of the bug

Hi,

on my hardware, a Lenovo Thinkpad T460p with Skylake Intel graphics, I'm
increasingly experience a "vblank wait timed out on crtc 0"-bug when resuming
from s2ram.

Whenever this bug occurs and the docking station is not used the backlit of the
internal display goes on but nothing is displayed. When resuming on a
docking-station attached with two 24"-displays it can happen that one of the
displays stays in standby.

Only a reboot can recover this issue.

>From my judgement the likelihood of getting this bug increased starting with
4.15 onwards (on every 4th or 5th resume) however I was always getting this bug
quite rarely, so I only started investigating this lately.

Currently I'm on kernel 4.17.3 with the most recent firmware files.

Hardware details.

00:02.0 VGA compatible controller: Intel Corporation HD Graphics 530 (rev 06)
(prog-if 00 [VGA controller])
        Subsystem: Lenovo HD Graphics 530
        Flags: bus master, fast devsel, latency 0, IRQ 127
        Memory at f2000000 (64-bit, non-prefetchable) [size=16M]
        Memory at c0000000 (64-bit, prefetchable) [size=512M]
        I/O ports at e000 [size=64]
        [virtual] Expansion ROM at 000c0000 [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

Please let me know if you need additional information or if I can test out
anything.

Thanks.

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