X and 2.4.0 problem (video bios probing?)

Hi there. Having been running the 2.4.0-test kernels on my laptop, I quickly upgraded to 2.4.0 when it came out. A problem quickly arose:

X won't start.

Under 2.4.0-test12 it works fine.

Under 2.4.0 it exits after trying to load the int10 module...

from 2.4.0-test12 (and all others):

(II) Loading sub module "int10"
(II) LoadModule: "int10"
(II) Loading /usr/X11R6/lib/modules/linux/libint10.a
(II) Module int10: vendor="The XFree86 Project"
compiled for 4.0.1a, module version = 1.0.0
ABI class: XFree86 Video Driver, version 0.2
(II) ATI(0): Primary V_BIOS segment is: 0xc000
(II) Loading sub module "ddc"
(II) LoadModule: "ddc"
(II) Loading /usr/X11R6/lib/modules/libddc.a
(II) Module ddc: vendor="The XFree86 Project"
compiled for 4.0.1a, module version = 1.0.0
ABI class: XFree86 Video Driver, version 0.2
(II) Loading sub module "vbe"
(II) LoadModule: "vbe"
(II) Loading /usr/X11R6/lib/modules/libvbe.a
(II) Module vbe: vendor="The XFree86 Project"
compiled for 4.0.1a, module version = 1.0.0
ABI class: XFree86 Video Driver, version 0.2
(II) ATI(0): VESA Bios detected
(II) ATI(0): VESA VBE Version 2.0
(II) ATI(0): VESA VBE Total Mem: 8128 kB
(II) ATI(0): VESA VBE OEM: ATI MACH64
(II) ATI(0): VESA VBE OEM Software Rev: 1.0
(II) ATI(0): VESA VBE OEM Vendor: ATI Technologies Inc.
(II) ATI(0): VESA VBE OEM Product: MACH64RM
(II) ATI(0): VESA VBE OEM Product Rev: 01.00
(II) ATI(0): VESA VBE DDC supported
(II) ATI(0): VESA VBE DDC Level none
(II) ATI(0): VESA VBE DDC transfer in appr. 2 sec.
(==) ATI(0): Chipset: "ati".
(--) ATI(0): ATI 3D Rage Mobility graphics controller detected.
(--) ATI(0): Chip type 4C4D "LM", version 4, foundry TSMC, class 0, revision 0x01. (--) ATI(0): AGP bus interface detected; block I/O base is 0x2000. (--) ATI(0): ATI Mach64 adapter detected.
(--) ATI(0): Internal RAMDAC (subtype 1) detected.
(--) ATI(0): 1400x1050 panel (ID 6) detected.
(--) ATI(0): Panel model IBM ITSX93.
(--) ATI(0): Panel clock is 107.859 MHz.

under 2.4.0 (final):

(II) Setting vga for screen 0.
(II) Loading sub module "int10"
(II) LoadModule: "int10"
(II) Loading /usr/X11R6/lib/modules/linux/libint10.a (II) Module int10: vendor="The XFree86 Project"
compiled for 4.0.1a, module version = 1.0.0 ABI class: XFree86 Video Driver, version 0.2
(EE) ATI(0): Unable to initialise int10 interface. (II) UnloadModule: "ati"
(II) UnloadModule: "int10"
(II) Unloading /usr/X11R6/lib/modules/linux/libint10.a (EE) Screen(s) found, but none have a usable configuration.

Fatal server error:
no screens found

Things I have ruled out:

- Compiled with redhat 7's gcc 2.96 snapshot, and also with kgcc. No diffrence.

- did a cat /proc/pci, lspci, and cat /proc/inturrupts and compaired 2.4.0 and 2.4.0-test12 and they were identical.

- Without changing anything besides the kernel X works. If I am in 2.4.0-test12 it's fine, if I am in 2.4.0 (final) it fails.

Further debugging, requests for logs, patches, or ideas are welcome.

This laptop is a dell inspiron 5000 (not 5000e). It has worked just fine with X until now. It's a redhat 7 + all errata. It has XFree86-4.0.1a on it.

thanks for any suggestions.

kevin
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Thats the critical bit but it isnt directly a kernel thing. Im not sure why it should have failed. Do you have different .config options (eg ATI fb options ?)

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Alan> Thats the critical bit but it isnt directly a kernel thing. Im Alan> not sure why it should have failed. Do you have different Alan> .config options (eg ATI fb options ?)

nope. I did do a 'make oldconfig' after patching to 2.4.0 (final), but all the other options are the same.

I was not using the ATI fb in either case. I had it built as a module, "ATI Rage 128 display support (EXPERIMENTAL)" (that I didn't load) and I did have "VESA VGA graphics console" enabled.

kevin
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Alan> Thats the critical bit but it isnt directly a kernel thing. Im Alan> not sure why it should have failed. Do you have different Alan> .config options (eg ATI fb options ?)

By the process of elimination, I have determined that my problem appears in the 2.4.0-test13-pre3 patch.

2.4.0-test13-pre2 X works fine, in pre3 and beyond it fails.

Anyone able to spot anything in the pre3 patch that might be causing this?

thanks,

kevin
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Duh.

I figured out the problem. In 2.4.0-test13-pre3 is the introduction of the shmall sysctl. I had installed a package called powertweak a while back. It looks like powertweak sets any sysctl it doesn't know to 0.

So, the problem was that there was no shared memory for X. ;(

I set that up to a reasonable level and all is well.

sorry for the wild goose chase. :(

kevin
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