For well over a year now, I (and apparently lots of other people) have
had to run patched kernels to avoid crippling hotplug storms.
As far as I can tell, on my laptop, enabling DPC_HOTPLUG_INT_EN is
safe, but setting either DPB_... or DPD_... (or both) will cause
intermittent hotplug interrupt storms. (Turning off all three DP
hotplug bits also makes the laptop stable but prevents the DP port
from working.)
My laptop is a Lenovo X200s with VGA and LVDS on the laptop itself and
DP on the docking port. If I boot w/o the docking port, I have:
General definitions block:
CRT DDC GMBUS addr: 0x02
Use ACPI DPMS CRT power states: no
Skip CRT detect at boot: no
Use DPMS on AIM devices: yes
Boot display type: 0x0000
TV data block present: yes
Child device info:
Device type: 1009 (TV)
Signature:
AIM offset: 0
DVO port: 0x05
Child device info:
Device type: 1022 (LFP)
Signature:
AIM offset: 52048
DVO port: 0x04
Child device info:
Device type: 68c6 (DisplayPort)
Signature:
AIM offset: 61152
DVO port: 0x08
Maybe it's time we started reading that part of VBIOS to detect which
outputs really exist. (If that's unsafe, we could add a DMI list.)
Any thoughts? It would be nice if 2.6.36 could work without patches.
Thanks,
Andy
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