[Bug 72782] New: screen blank on S3 resume on HP Mini Atom N270 Intel Mobile 945GSE

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=72782

          Priority: medium
            Bug ID: 72782
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: screen blank on S3 resume on HP Mini Atom N270 Intel
                    Mobile 945GSE
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: major
    Classification: Unclassified
                OS: Linux (All)
          Reporter: colin.king at canonical.com
          Hardware: x86 (IA32)
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

There is a S3 resume issue that affects HP Mini Atom N270 with Intel
Mobile 945GSE on Linux 3.9.0 upwards.

Device:
00:02.0 VGA compatible controller [0300]: Intel Corporation Mobile
945GSE Express Integrated Graphics Controller [8086:27ae] (rev 03)
(prog-if 00 [VGA controller])
        Subsystem: Hewlett-Packard Company Device [103c:361a]
        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 16
        Region 0: Memory at fe980000 (32-bit, non-prefetchable) [size=512K]
        Region 1: I/O ports at dc80 [size=8]
        Region 2: Memory at d0000000 (32-bit, prefetchable) [size=256M]
        Region 3: Memory at fe940000 (32-bit, non-prefetchable) [size=256K]
        Expansion ROM at <unassigned> [disabled]
        Capabilities: <access denied>
        Kernel driver in use: i915

Issue: On S3 resume screen is blank.  I've tracked this down to 2 patches:

1. 24576d23976746cb52e7700c4cadbf4bc1bc3472

drm/i915: enable VT switchless resume v3

This commit stops the screen from turning back on. Without the patch the
screen resumes back to on, however it is filled with random vertical lines.

2. fa55583797d12b10928a1813f3dcf066637caf5e

drm/i915: fixup the plane->pipe fixup code

I have to manually revert this.  If I don't I get the random vertical
lines on resume.

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