[Bug 101691] gfx corruption on windowed 3d-apps running on dGPU

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101691

--- Comment #40 from Ethan Hsieh <ethan.hsieh at canonical.com> ---
Cannot reproduce corruption issue with SNA_POWERSAVE enabled.

(Have to re-plug AC adapter to make the workaround work)
xserver-xorg-video-intel-2.99.917+git20160325/src/sna/sna_acpi.c
@@ -123,10 +123,14 @@ void _sna_acpi_wakeup(struct sna *sna)
     state = atoi(space + 1);

    DBG(("%s: ac_adapter event new state=%d\n", __FUNCTION__, state));
+#if 0
    if (state)
     sna->flags &= ~SNA_POWERSAVE;
    else
     sna->flags |= SNA_POWERSAVE;
+#endif
+       DBG(("%s: enable SNA_POWERSAVE\n", __FUNCTION__));
+       sna->flags |= SNA_POWERSAVE;
   }

Xorg.0.org:
$ grep -r -i -e "ac_ad" -e "enable SNA" /var/log/Xorg.0.log
[ 112.044] _sna_acpi_wakeup: event string [41]: 'ac_adapter ACPI0003:00
00000080 00000000
[ 112.044] _sna_acpi_wakeup: ac_adapter event new state=0
[ 112.044] _sna_acpi_wakeup: enable SNA_POWERSAVE
[ 123.003] _sna_acpi_wakeup: event string [41]: 'ac_adapter ACPI0003:00
00000080 00000001
[ 123.003] _sna_acpi_wakeup: ac_adapter event new state=1
[ 123.003] _sna_acpi_wakeup: enable SNA_POWERSAVE

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