[Bug 73469] New: i965/sna: DPMS off/on freezes GL application
bugzilla-daemon at freedesktop.org
bugzilla-daemon at freedesktop.org
Fri Jan 10 02:13:11 PST 2014
https://bugs.freedesktop.org/show_bug.cgi?id=73469
Priority: medium
Bug ID: 73469
CC: intel-gfx-bugs at lists.freedesktop.org
Assignee: intel-gfx-bugs at lists.freedesktop.org
Summary: i965/sna: DPMS off/on freezes GL application
QA Contact: intel-gfx-bugs at lists.freedesktop.org
Severity: normal
Classification: Unclassified
OS: Linux (All)
Reporter: h.judt at gmx.at
Hardware: x86-64 (AMD64)
Status: NEW
Version: XOrg CVS
Component: DRM/Intel
Product: DRI
This does not occur with UXA, only with SNA:
Steps to reproduce:
1) Start desktop environment. I use compiz-0.8 as window manager.
2) Launch glxgears, keep it running.
3) Issue the following command:
xset dpms force off; sleep 2; xset dpms force on
Expected results:
Monitor switches off and on, nothing else happens.
Actual results:
Monitor switches off and on, glxgears is frozen.
Interestingly, compiz is still responsible when performing above steps.
Now replace glxgears with xscreensaver which can turn off the monitor too, and
the issue gets more severe. I usually have to kill compiz to get a usable X
session again.
On a side note: I often get such messages in dmesg:
[drm] Setting output timings on SDVOB failed
What do they mean? What is SDVOB? Are they harmless?
lspci -v:
00:02.0 VGA compatible controller: Intel Corporation 4 Series Chipset
Integrated Graphics Controller (rev 03) (prog-if 00 [VGA controller])
Subsystem: Dell Device 0276
Flags: bus master, fast devsel, latency 0, IRQ 44
Memory at fe800000 (64-bit, non-prefetchable) [size=4M]
Memory at d0000000 (64-bit, prefetchable) [size=256M]
I/O ports at ec90 [size=8]
Expansion ROM at <unassigned> [disabled]
Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
Capabilities: [d0] Power Management version 2
Kernel driver in use: i915
xorg.conf:
Section "Device"
Identifier "Intel"
Driver "intel"
# Output configuration
Option "Monitor-VGA1" "Samsung SyncMaster SA450 VGA"
Option "Monitor-DVI1" "Samsung SyncMaster SA450 DVI"
# Tweaks
Option "AccelMethod" "sna"
Option "PageFlip" "true"
Option "TripleBuffer" "true"
Option "TearFree" "true"
Option "VSync" "true"
EndSection
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