No X with Intel 855 on fresh install of CURRENT
 

I just did a fresh install of Slackware Current and X isn't working. I type startx and I see some distorted images and then a blank screen. I have to Ctrl-Alt-Bkspace to exit.

My entire xlog was too big to post.

The relevant errors are
(EE) intel(0): detecting sil164
(EE) intel(0): Unable to read from DVOI2C_E Slave 112.
(EE) intel(0): Unable to read from DVOI2C_E Slave 236.
(EE) intel(0): I830 Vblank Pipe Setup Failed 0

Some possibly relevant warnings:
(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(WW) intel(0): p1 out of range
(WW) intel(0): Bad V_BIOS checksum
(WW) intel(0): BIOS panel mode data doesn't match probed data, continuing with probed.
(WW) intel(0): Register 0x61200 (PP_STATUS) changed from 0xc0000008 to 0xd0000009
(WW) intel(0): PP_STATUS before: on, ready, sequencing idle
(WW) intel(0): PP_STATUS after: on, ready, sequencing on
(WW) intel(0): DRM version 1.6 older than required 1.7 for DRM memory manager. Disabling.
(WW) intel(0): p1 out of range
(WW) AIGLX: 3D driver claims to not support visual 0x23
(WW) AIGLX: 3D driver claims to not support visual 0x24
(WW) AIGLX: 3D driver claims to not support visual 0x25
(WW) AIGLX: 3D driver claims to not support visual 0x26
(WW) AIGLX: 3D driver claims to not support visual 0x27
(WW) AIGLX: 3D driver claims to not support visual 0x28
(WW) AIGLX: 3D driver claims to not support visual 0x29
(WW) AIGLX: 3D driver claims to not support visual 0x2a
(WW) AIGLX: 3D driver claims to not support visual 0x2b
(WW) AIGLX: 3D driver claims to not support visual 0x2c
(WW) AIGLX: 3D driver claims to not support visual 0x2d
(WW) AIGLX: 3D driver claims to not support visual 0x2e
(WW) AIGLX: 3D driver claims to not support visual 0x2f
(WW) AIGLX: 3D driver claims to not support visual 0x30
(WW) AIGLX: 3D driver claims to not support visual 0x31
(WW) AIGLX: 3D driver claims to not support visual 0x32
(WW) intel(0): Register 0x61200 (PP_STATUS) changed from 0xc0000008 to 0xd0000009
(WW) intel(0): PP_STATUS before: on, ready, sequencing idle
(WW) intel(0): PP_STATUS after: on, ready, sequencing on
(WW) intel(0): p1 out of range

my xorg.conf generated from Xorg -configure
Agpgart detects my card on startup.
I've tried using the i810 driver with the same result and using the default xorg.conf for Slackware (adjusting the device lines) to no avail and all of these methods have worked before.

Anyone else had problems?
Thanks in advance for any help.

I'm a bit confused. Is this a plug-in card, or an onboard card? It appears to be onboard, but please clarify that. I have the i810 device as an onboard device, and use(d) the i810 driver for it, but I'm not sure if it is capable of anything fancy, like GLX, 3D stuff, and particularly anything AGP. I have a plug-in AGP card.
Might help to put in the HorizSync, VertRefresh values, as well as adding some resolutions to the Screen section. I say this because maybe probing is failing and no usable configuration is being found?.

Solved
 

Thanks for the advice, I figured it out.

For the record:
1. Xorg -configure generated an xorg.conf file that used the intel driver.
2. This is the configuration that failed.
3. I was reading on the freedesktop.org mailing lists that the intel driver can crash and leave the graphics engine in an unusable state until reboot.
4. Therefore all the fixes I was trying were destined to fail.
5. After reboot I chose the i810 driver, set the default depth and mode settings in xorg.conf like suggested and everything worked.

Thanks again for the help.