Mailinglist Archive: radeonhd (212 mails)

[Sylvain Joyeux <sylvain.joyeux@xxxxxxx>]

I just bought myself a U330 with an intel IGP and a radeon HD 3400 (switchable 
graphics). Its BIOS allows to disable the IGP, in which case the radeonhd 
driver works perfectly fine.

However, when I go into "switchable graphics" mode in the BIOS, it the 
initialization fails. It seems that I hit the "cannot read ROM" bug. I tried 
the various hacks lying around, but it did not fix my particular situation. 
Namely, I tried:

  making sure that /sys/bus/pci/devices/<id>/enable is 1
  echoing 1 to /sys/bus/pci/devices/<id>/rom
  making sure that the card's COMMAND register has its two first bits set
  making sure that the card's ROM_ADDRESS register has the right value (with 
     first bit enabled to enable the ROM)

cat-ing the rom file on sysfs fails with input/output error, and a dmesg that 
says that the ROM is invalid.
  
Any clue as to what I can try now ?

FYI, I'd like to boot in that mode to use the new powermanagement code in 
radeonhd and shut down the card as deep as possible ... so that I can save 
some battery by running only the intel chip. Does that make sense ? I tried 
putting it to D3 by writing a small kernel module, but that does not reduce 
the power consumption significantly (strangely enough).

Sylvain
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