1680x1050 dual head on i810 (830M chip)

Konstantin Antselovich konstantin at antselovich.com
Wed Aug 23 17:20:45 PDT 2006

Hi xorg gurus, need your help!

I'm trying to configure Xorg for dual head on Fedora Core 5 with 20'
external monitor connected to a laptop. Laptop is fujitsu "lifebook"
with Intel 830M chip and 15' LCD supporting 1024x768. External monitor
is Samsung SyncMaster 205BW, with max resolution 1680x1050.

[I think] my configuration recognizes 2 screens and 2 devices
(II) I810: Driver for Intel Integrated Graphics Chipsets: i810, i810-dc100,
        i810e, i815, i830M, 845G, 852GM/855GM, 865G, 915G, E7221 (i915),
        915GM, 945G, 945GM
(II) Primary Device is: PCI 00:02:0
(--) Chipset i830M found
(--) Chipset i830M found


(II) I810(0): Currently active displays on Pipe A:
(II) I810(0):   LFP (local flat panel)
(II) I810(0): Lowest common panel size for pipe A is 1024 x 768
(II) I810(0): Currently active displays on Pipe B:
(II) I810(0):   DFP (digital flat panel)
(II) I810(0): No display size information available for pipe B.

but then X fails with this error:
(EE) I810(0): No Video BIOS modes for chosen depth.
(EE) I810(1): Failed to setup second head due to primary head failure.
(EE) Screen(s) found, but none have a usable configuration.

If I comment out BusID for second "Device", X starts but only one
(internal LCD) screen works.

After reading in archives and some active googling,  I suspect that I'm
hitting something that is related to a feature of some intel 8xx/9xx
chips: load only video modes stored in BIOS.  But my  'x-knowledge'  is
 fairly limited, so I cannot  figure out the right solution.

I tried to overwrite vbios with 855resolution:
RESOLUTION="1680 1050"
But I don't think that it's working in my case. Reading vbios again
shows no changes.

I've attached my xorg.conf and log output for both working and
non-working situations, and output of 855resolution.

All responses are appreciated,

Konstantin Antselovich
mailto: konstantin at antselovich.com

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