[Bug 33968] New: Screen will not unblank after DPMS suspend/off

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=33968

           Summary: Screen will not unblank after DPMS suspend/off
           Product: xorg
           Version: 7.6
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: hallbw at gmail.com
         QAContact: xorg-team at lists.x.org


After DPMS blanking occurs by whatever method (blank timeout or force off),
display will not unblank after pressing a key or moving the mouse. System is
fully responsive by ssh, etc- it is just a display issue. Blanking works fine
with this LCD monitor using the same system but with a discrete PCIe nvidia
8400GS & nouveau. LCD monitor is connected via DVI-D cable. 

Display is an onboard Radeon 4250 on a Biostar A785GE motherboard.

Workaround is to completely disable DPMS. However, even with DPMS "disabled" in
xorg and with xset, can still trigger the problem with "xset dpms force off".

01:05.0 0300: 1002:9710
01:05.0 VGA compatible controller: ATI Technologies Inc RS880 [Radeon HD 4200]
(prog-if 00 [VGA controller])
    Subsystem: Biostar Microtech Int'l Corp Device 1704
    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, Cache Line Size: 64 bytes
    Interrupt: pin A routed to IRQ 18
    Region 0: Memory at f0000000 (32-bit, prefetchable) [size=128M]
    Region 1: I/O ports at d000 [size=256]
    Region 2: Memory at fe8f0000 (32-bit, non-prefetchable) [size=64K]
    Region 5: Memory at fe700000 (32-bit, non-prefetchable) [size=1M]
    Expansion ROM at <unassigned> [disabled]
    Capabilities: [50] Power Management version 3
        Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
        Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
    Capabilities: [a0] MSI: Enable- Count=1/1 Maskable- 64bit+
        Address: 0000000000000000  Data: 0000
    Kernel driver in use: radeon
    Kernel modules: radeon


Arch Linux x86_64
kernel 2.6.37
xf86-video-ati 6.14.0-1

xorg-apps 7.6-1
xorg-docs 1.6-1
xorg-font-utils 7.6-1
xorg-fonts-100dpi 1.0.1-3
xorg-fonts-75dpi 1.0.1-3
xorg-fonts-alias 1.0.2-1
xorg-fonts-encodings 1.0.3-1
xorg-fonts-misc 1.0.1-1
xorg-iceauth 1.0.4-1
xorg-luit 1.1.0-1
xorg-res-utils 1.0.3-3
xorg-server 1.9.4-1
xorg-server-common 1.9.4-1
xorg-server-utils 7.6-1
xorg-sessreg 1.0.6-1
xorg-twm 1.0.6-1
xorg-util-macros 1.11.0-1
xorg-utils 7.6-6
xorg-x11perf 1.5.3-1
xorg-xauth 1.0.5-1
xorg-xbacklight 1.1.2-1
xorg-xcmsdb 1.0.3-1
xorg-xcursorgen 1.0.4-1
xorg-xdpyinfo 1.2.0-1
xorg-xdriinfo 1.0.4-1
xorg-xev 1.1.0-1
xorg-xgamma 1.0.4-1
xorg-xhost 1.0.4-1
xorg-xinit 1.3.0-2
xorg-xinput 1.5.3-1
xorg-xkb-utils 7.5-2
xorg-xkill 1.0.3-1
xorg-xlsatoms 1.1.0-1
xorg-xlsclients 1.1.1-1
xorg-xlsfonts 1.0.3-1
xorg-xmodmap 1.0.5-1
xorg-xpr 1.0.3-1
xorg-xprop 1.2.0-1
xorg-xrandr 1.3.4-1
xorg-xrdb 1.0.8-1
xorg-xrefresh 1.0.4-1
xorg-xset 1.2.1-1
xorg-xsetroot 1.1.0-1
xorg-xvinfo 1.1.1-1
xorg-xwd 1.0.4-1
xorg-xwininfo 1.1.1-1
xorg-xwud 1.0.3-1

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