[gentoo-user] xorg i810/i915 mode problem (modular X)

["W.Kenworthy" <billk@iinet.net.au>]

I have a new Sony Vaio laptop with a 1366x768 screen using the intel
"Mobile 915GM/GMS/910GML Express Graphics Controller" which can be
driven by the xorg i810 driver.  Works fine on the laptop in this
resolution.

The problem I have is that many of the possible modes for this chipset
return blank when xorg starts as in the example below from the xorg log
- the mode I want to use is 1280x1024 for an external projector.

I have (once!) been able to get 1280x1024 using 915resolution to force
the mode, and two screens but I need to use clone mode so this wasnt
practical (I want clone mode with the same desktop on both screens)

Can someone point me towards a solution please.  It seems to me that
xorg is not reading the chipset correctly.  Note that ddc on or off
doesnt help (and if I have an external monitor attached when xorg
starts, it really stuffs things up, also ddc on or off!)

My requirement is to use 1360x768 when standalone, or 1280x1024 on
either an LCD desk monitor, or same resolution on a projector in clone
mode.  When doing the external thing, the laptop screen doesnt have to
be 'perfect'.  Currently I can do this, but only in 1024x768, which
looks terrible on the ext LCD due to aliasing.


BillK


...

Mode: 5c (0x0)
        ModeAttributes: 0x0
        WinAAttributes: 0x0
        WinBAttributes: 0x0
        WinGranularity: 0
        WinSize: 0
        WinASegment: 0x0
        WinBSegment: 0x0
        WinFuncPtr: 0x0
        BytesPerScanline: 0
        XResolution: 0
        YResolution: 0
        XCharSize: 0
        YCharSize: 0
        NumberOfPlanes: 0
        BitsPerPixel: 0
        NumberOfBanks: 0
        MemoryModel: 0
        BankSize: 0
        NumberOfImages: 0
        RedMaskSize: 0
        RedFieldPosition: 0
        GreenMaskSize: 0
        GreenFieldPosition: 0
        BlueMaskSize: 0
        BlueFieldPosition: 0
        RsvdMaskSize: 0
        RsvdFieldPosition: 0
        DirectColorModeInfo: 0
        PhysBasePtr: 0x0
        LinBytesPerScanLine: 0
        BnkNumberOfImagePages: 0
        LinNumberOfImagePages: 0
        LinRedMaskSize: 0
        LinRedFieldPosition: 0
        LinGreenMaskSize: 0
        LinGreenFieldPosition: 0
        LinBlueMaskSize: 0
        LinBlueFieldPosition: 0
        LinRsvdMaskSize: 0
        LinRsvdFieldPosition: 0
        MaxPixelClock: 0

...
(II) I810(0): Monitor0: Using hsync range of 31.50-100.00 kHz
(II) I810(0): Monitor0: Using vrefresh range of 40.00-110.00 Hz
(II) I810(0): Not using mode "1280x1024" (no mode of this name)
(II) I810(0): Not using mode "1152x864" (no mode of this name)
(II) I810(0): Not using mode "832x624" (no mode of this name)
(II) I810(0): Not using mode "720x400" (no mode of this name)
(II) I810(0): Correcting stride (1368 -> 2752)
(II) I810(0): Increasing the scanline pitch to allow tiling mode (1376
-> 2048).
(--) I810(0): Virtual size is 1368x768 (pitch 2048)
(**) I810(0): *Built-in mode "1360x768"
(**) I810(0): *Built-in mode "1024x768"
(**) I810(0): *Built-in mode "800x600"
(**) I810(0): *Built-in mode "640x480"
(**) I810(0):  Built-in mode "1360x768"
(**) I810(0):  Built-in mode "1064x600"

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