[Openchrome-users] CN700 not working, blank screen

[Jan Wagner]

Hi,

just compiled openchrome from current SVN and use 'stow' for the install. 
However, as soon as X starts, the LCD screen goes just blank although 
backlight remains on. This is on an Epia CN10000, VGA connector. Any 
suggestions how to get this working?

'dmidecode' doesn't work on the CN, it only says "No SMBIOS nor DMI entry 
point found, sorry.".

'lspci' says these things about the CN700:

a)
01:00.0 VGA compatible controller: VIA Technologies, Inc. UniChrome Pro 
IGP (rev 01) (prog-if 00 [VGA])
         Subsystem: VIA Technologies, Inc. UniChrome Pro IGP
         Flags: bus master, 66MHz, medium devsel, latency 32, IRQ 11
         Memory at f4000000 (32-bit, prefetchable)
         Memory at fb000000 (32-bit, non-prefetchable)
         Capabilities: [60] Power Management version 2
         Capabilities: [70] AGP version 3.0
b)
  +-00.7  VIA Technologies, Inc. CN700/VN800/P4M800CE/Pro Host Bridge
  +-01.0-[0000:01]----00.0  VIA Technologies, Inc. UniChrome Pro IGP
c)
  +-00.7  1106:7314
  +-01.0-[0000:01]----00.0  1106:3344

The monitor says 1280x1024 75Hz which is a correct setting and one that 
works when I use vesa instead of via in the xorg.conf drivers section.

Here is the xorg.conf and also some settings that I already tried adding 
and toggling, to no avail, screen remains blank:

Section "Device"
         Identifier      "CN700"
         Driver          "via" # compiled from openchrome sources
         BusID           "PCI:1:0:0" # from lspci
         Option          "EnableAGPDMA"          "false"
         Option          "DisableIRQ"            "true"
         Option          "VBEModes"              "true"
#       Option          "ForcePanel"            "true"
EndSection

and

Section "Monitor"
         Identifier      "Generic Monitor"
         Option          "DPMS"
         HorizSync       30-81
         VertRefresh     56-75
EndSection

Section "Screen"
         Identifier      "Default Screen"
         Device          "CN700"
         Monitor         "Generic Monitor"
         DefaultDepth    24
         SubSection "Display"
                 Depth           24
                 Modes           "1280x1024" "1024x768"
         EndSubSection
EndSection

Section "DRI"
         Mode    0666
EndSection


The Xorg.0.log does not contain any errors.
...
(II) VIA: driver for VIA chipsets: CLE266, KM400/KN400, K8M800,
         PM800/PM880/CN400, VM800/CN700/P4M800Pro
(II) Primary Device is: PCI 01:00:0
(--) Chipset VM800/CN700/P4M800Pro found
...
(II) VIA(0): VT162xSave
(II) VIA(0): Trying VBE Mode 1280x1024 (0xc11b) Refresh 75.02:
(II) VIA(0): ViaVbeSetRefresh
(II) VIA(0): Active Device: 1
(II) VIA(0): Refresh Rate Index: 5
(II) VIA(0): VBESetVBEMode failed...but worked OK without customized 
refresh and dotclock.
(II) VIA(0): VIAAdjustFrame
(II) VIA(0): - Blanked
...
drmOpenDevice: node name is /dev/dri/card0
drmOpenDevice: open result is 7, (OK)
drmOpenDevice: node name is /dev/dri/card0
drmOpenDevice: open result is 7, (OK)
drmOpenByBusid: Searching for BusID PCI:1:0:0
drmOpenDevice: node name is /dev/dri/card0
drmOpenDevice: open result is 7, (OK)
drmOpenByBusid: drmOpenMinor returns 7
drmOpenByBusid: drmGetBusid reports pci:0000:01:00.0
(II) VIA(0): [drm] DRM interface version 1.3
(II) VIA(0): [drm] created "via" driver at busid "PCI:1:0:0"
...
(II) VIA(0): [drm] Detected AGP vendor 0x1106, device 0x04314
(II) VIA(0): [drm] Found AGP v3 compatible device. Trying AGP 8X mode.
(II) VIA(0): [drm] Trying to enable AGP fast writes.
(II) VIA(0): [drm] drmAgpEnabled succeeded
(II) VIA(0): [drm] agpAddr = 0xe8000000
(II) VIA(0): [drm] agpBase = (nil)
(II) VIA(0): [drm] agpAddr = 0xe8000000
(II) VIA(0): [drm] agpSize = 0x02000000
(II) VIA(0): [drm] agp physical addr = 0x00000000
(II) VIA(0): [dri] use agp.
(II) VIA(0): [drm] Using 45860832 bytes for DRM memory heap.
(II) VIA(0): [dri] frame buffer initialized.
(II) VIA(0): X context handle = 0x1
(II) VIA(0): [drm] installed DRM signal handler
(II) VIA(0): [DRI] installation complete
(II) VIA(0): [dri] kernel data initialized.
(END)

but screen remains blank.

Any ideas?

TIA,
  - Jan