[Openchrome-devel] PCI bus corruption?

[Yuval Hager]

Hi,

This issue has started a while ago in the bcm43xx-dev, then moved to lkml and 
now it has arrived here.

When the screen is waken up after blanking (e.g. by calling 'xset dpms force 
standby' and then moving the mouse a bit) the output from lspci on a specific 
card becomes all 1's. This has been suspected to be a hardware problem at 
first, but it's very consistent, and also cpuburn/mprime tests have passed 
successfully.

The problem occurs with 'openchrome' trunk version on the scenario above (and 
other similar operations, like 'xset -dpms'), and with 'via' driver 
immediately when X is loaded (actually, not X per se, rather xdm/kdm). I 
could not recreate it on 'vesa' driver.

Here's the correct output, before blanking the screen:
* lspci -d 14e4:4312 -x
02:00.0 Network controller: Broadcom Corporation BCM4312 802.11a/b/g (rev 02)
00: e4 14 12 43 06 01 10 00 02 00 80 02 08 00 00 00
10: 04 c0 ff fd 00 00 00 00 00 00 00 00 00 00 00 00
20: 00 00 00 00 00 00 00 00 00 00 00 00 3c 10 71 13
30: 00 00 00 00 40 00 00 00 00 00 00 00 0a 01 00 00

And here's what happens after I wake it from a screen blank:
$ lspci -d 14e4:4312 -x
02:00.0 Network controller: Broadcom Corporation BCM4312 802.11a/b/g (rev ff)
00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
10: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
20: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
30: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff

If  I blank again, while the screen is blank I get 
$ lspci -d 14e4:4312 -x
02:00.0 Network controller: Broadcom Corporation BCM4312 802.11a/b/g (rev 02)
00: e4 14 12 43 00 00 10 00 02 00 80 02 00 00 00 00
10: 04 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
20: 00 00 00 00 00 00 00 00 00 00 00 00 3c 10 71 13
30: 00 00 00 00 40 00 00 00 00 00 00 00 00 01 00 00

and awake again, it comes back to the 0xff pattern...

The end result is that the wireless PCIe card becomes unusable until next 
reboot.

The machine is HP2133, HP model number is FU346EA#ABT (VIA C7M/2GB/120GB). The 
graphics card is P4M900 and you can see an Xorg.0.log output in 
http://zlin.dk/p/?MGFkZjI0. The lkml discussion started here: 
http://lkml.org/lkml/2008/11/21/229.

I can add more logs and do more tests as needed. I believe this is an 
important issue and I would like to help get it fixed (or identify it as a 
flawed hardware).

Thanks,

--yuval
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