Not sure I understand the question. The power management code in radeonhd only affects the HD3400, not the Intel chip. I imagine you would save more power by disabling the IGP in BIOS. -----Original Message----- From: Sylvain Joyeux [mailto:sylvain.joyeux@m4x.org] Sent: Tuesday, August 04, 2009 1:04 PM To: radeonhd@opensuse.org Subject: [radeonhd] RadeonHD 3400 not recognized on a "switchable graphics" system 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 -- To unsubscribe, e-mail: radeonhd+unsubscribe@opensuse.org For additional commands, e-mail: radeonhd+help@opensuse.org -- To unsubscribe, e-mail: radeonhd+unsubscribe@opensuse.org For additional commands, e-mail: radeonhd+help@opensuse.org