Re: 2.6.13-mm2

[Manuel Lauss]

Hello,

Andrew Morton wrote:

> +i810fb-add-i2c-ddc-support.patch
> +i810fb-add-i2c-ddc-support-fix.patch
> +i810fb-add-i2c-ddc-support-fix-fix.patch
> +i810fb-add-i2c-ddc-support-Makefile-fix.patch

compiled with CONFIG_FB_I810_I2C = n and CONFIG_FB_I810 = y
it oopses at boot in file drivers/video/i810/i810_main.c:1884

...
Kernel command line: root=/dev/hda7 video=i810fb:xres:1024,yres:768,bpp:8,hsync1:40,hsync2:80,vsync1:60,vsync2:60,extvga,vram:4,accel,mtrr
...
Unable to handle kernel NULL pointer dereference at virtual address 00000054
 printing eip:
c02543c0
*pde = 00000000
Oops: 0000 [#1]
last sysfs file:
Modules linked in:
CPU:    0
EIP:    0060:[<c02543c0>]    Not tainted VLI
EFLAGS: 00010286   (2.6.13-mm2)
EIP is at i810fb_find_init_mode+0x53/0x93
eax: c113ddd4   ebx: c1194000   ecx: c04be2dd   edx: c1194000
esi: c1194008   edi: c113ddd4   ebp: c1194240   esp: c113ddcc
ds: 007b   es: 007b   ss: 0068
Process swapper (pid: 1, threadinfo=c113c000 task=c7cd6a30)
Stack: 00000000 00000008 00000400 00000300 00000000 00001000 00000000 00000000
       00000008 00000000 00000000 00000000 00000000 00000000 00000000 00000000
       00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
Call Trace:
 [<c01ecb01>] fb_alloc_cmap+0x8d/0xa0
 [<c025491b>] i810fb_init_pci+0x10a/0x23c
 [<c026dd9e>] __driver_attach+0x0/0x33
 [<c01e1198>] pci_call_probe+0xa/0xc
 [<c01e11c8>] __pci_device_probe+0x2e/0x3f
 [<c01e11f7>] pci_device_probe+0x1e/0x30
 [<c026dcfb>] driver_probe_device+0x31/0x82
 [<c026ddc1>] __driver_attach+0x23/0x33
 [<c026d60f>] bus_for_each_dev+0x35/0x59
 [<c026dde2>] driver_attach+0x11/0x13
 [<c026dd9e>] __driver_attach+0x0/0x33
 [<c026d993>] bus_add_driver+0x52/0x92
 [<c026e0a2>] driver_register+0x2f/0x34
 [<c01e1394>] pci_register_driver+0x64/0x74
 [<c0254b51>] i810fb_init+0x2f/0x36
 [<c049a676>] do_initcalls+0x49/0x8e
 [<c0100269>] init+0x0/0x107
 [<c010028b>] init+0x22/0x107
 [<c0101281>] kernel_thread_helper+0x5/0xb
Code: 02 00 00 f3 ab 8d 73 08 b9 a0 00 00 00 89 f2 89 e0 89 e7 e8 5f 8a f8 ff 8b 0d 78 8e 4f c0 85 c9 74 1d ff 73 20 89 da 89 f8 6a 00 <ff> 35 54 00 00 00 ff 35 20 00 00 00 e8 37
 <0>Kernel panic - not syncing: Attempted to kill init!


A few debug printks suggest the pointer "specs" is NULL.

with CONFIG_FB_I810_I2C = y it survives boot, but does not work, i.e. on
this laptop there is no EDID and bios table seems borked/missing;
the driver also does no longer honour the commandline parameters
(xres/yres v/hsync1/2) and simply defaults to 640x480.

Built with CONFIG_I810_FB = m, it does _nothing_ when insmod'ded, not even
print the i810fb banner in dmesg; lsmod shows the module is there.

Unapplying the above mentioned patches makes it work again

Thanks,

--
 Manuel Lauss
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