[Openchrome-users] [openChrome] #29: Changing VTs causes LCD backlight to be switched off.

[openChrome]

#29: Changing VTs causes LCD backlight to be switched off.
----------------------+-----------------------------------------------------
Reporter:  anonymous  |       Owner:  somebody               
    Type:  defect     |      Status:  new                    
Priority:  major      |   Component:  xdriver                
 Version:             |    Keywords:  VT switching, LCD light
----------------------+-----------------------------------------------------
I have just tried revision 166 as a first openchrome driver for my
 Acer Aspire 1535. The VT switching code is broken resulting in a black
 screen when trying to use a new VT.

 lspci -vvv reports:

 0000:01:00.0 VGA compatible controller: VIA Technologies, Inc. VT8378 [S3
 UniChrome] Integrated Video (rev 01) (prog-if 00 [VGA])
         Subsystem: Acer Incorporated [ALI]: Unknown device 0033
         Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
 ParErr- Stepping- SERR- FastB2B-
         Status: Cap+ 66MHz+ UDF- FastB2B- ParErr- DEVSEL=medium >TAbort-
 <TAbort- <MAbort- >SERR- <PERR-
         Latency: 64 (500ns min)
         Interrupt: pin A routed to IRQ 4
         Region 0: Memory at f0000000 (32-bit, prefetchable) [size=64M]
         Region 1: Memory at d1000000 (32-bit, non-prefetchable) [size=16M]
         Capabilities: [60] Power Management version 2
                 Flags: PMEClk- DSI+ D1+ D2+ AuxCurrent=0mA
 PME(D0-,D1-,D2-,D3hot-,D3cold-)
                 Status: D0 PME-Enable- DSel=0 DScale=0 PME-
         Capabilities: [70] AGP version 2.0
                 Status: RQ=32 Iso- ArqSz=0 Cal=0 SBA+ ITACoh- GART64-
 HTrans- 64bit- FW- AGP3- Rate=x1,x2,x4
                 Command: RQ=32 ArqSz=0 Cal=0 SBA+ AGP+ GART64- 64bit- FW-
 Rate=<none>


 I have a patch which fixes this for me:

 Index: via_mode.c
 ===================================================================
 --- via_mode.c  (revision 166)
 +++ via_mode.c  (working copy)
 @@ -1927,11 +1927,13 @@
  #endif

      /* Enable LCD */
 -    if (On)
 +    if (On){
 +        pBIOSInfo->LCDPower(pScrn, TRUE);
         ViaCrtcMask(hwp, 0x6A, 0x08, 0x08);
 -    else
 +    }else{
 +        pBIOSInfo->LCDPower(pScrn, FALSE);
         ViaCrtcMask(hwp, 0x6A, 0x00, 0x08);
 -
 +    }
      /* Find Panel Size Index for PowerSeq Table */
      if (pVia->Chipset == VIA_CLE266) {
          if (pBIOSInfo->PanelSize != VIA_PANEL_INVALID) {

 I think you might want to include it

 Mark

-- 
Ticket URL: <http://www.openchrome.org/trac/ticket/29>
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