[Bug 97602] New: Enabled PSR causes system lockups after screen was disabled (DELL XPS 13, Broadwell-U)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97602

            Bug ID: 97602
           Summary: Enabled PSR causes system lockups after screen was
                    disabled (DELL XPS 13, Broadwell-U)
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: critical
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: linux at brodo.de
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Since commit 9b58e352b463f2f096d699d47b1c4c57879b617f up to v4.8-rc5, my DELL
XPS 13 experiences lock-ups whenever the screen is re-enabled after having been
disabled by power management. Suspend-resume works fine.

Further data points: i915.enable_psr=0 works fine. i915.enable_psr=2 causes
screen flickering, i915.enable_psr=3 also shows the buggy behavior.

With i915.enable_psr=0 the output of
/sys/kernel/debug/dri/0/i915_edp_psr_status is:

Sink_Support: yes
Source_OK: no
Enabled: no
Active: no
Busy frontbuffer bits: 0x000
Re-enable work scheduled: no
Main link in standby mode: no
HW Enabled & Active bit: no
Performance_Counter: 0

This is on a DELL XPS 13, Debian Jessie (running Gnome), with the lspci -vvv
snippet:

00:02.0 VGA compatible controller: Intel Corporation Broadwell-U Integrated
Graphics (rev 09) (prog-if 00 [VGA controller])
        Subsystem: Dell Device 0665
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx+
        Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort-
<MAbort- >SERR- <PERR- INTx-
        Latency: 0
        Interrupt: pin A routed to IRQ 42
        Region 0: Memory at f6000000 (64-bit, non-prefetchable) [size=16M]
        Region 2: Memory at e0000000 (64-bit, prefetchable) [size=256M]
        Region 4: I/O ports at f000 [size=64]
        [virtual] Expansion ROM at 000c0000 [disabled] [size=128K]
        Capabilities: <access denied>
        Kernel driver in use: i915

Oh, and the bug reported yesterday (concerning commit 1c80c25fb6) to the
mailing lists is unrelated to this bug.

Best,
Dominik

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