Hi guys! As already mentioned in another thread, I'm a user of a Thinkpad E520 with muxless switchable graphics. I tried to investigate what goes wrong when Xorg tries to use the fglrx driver and fails with the error message "invalid video bios signature". So I tried to dump the video BIOS like that: stefan@TE520:~$ echo 1 | sudo tee /sys/devices/pci0000\:00/0000\:00\:01.0/0000\:01\:00.0/rom stefan@TE520:~$ sudo cat /sys/devices/pci0000\:00/0000\:00\:01.0/0000\:01\:00.0/rom > vbios_ati.rom
However this fails with the error message: "cat: /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/rom: Input/output error" Doing the same with the intel card works. So now I think: Is this the cause (i.e. the fglrx driver relies on the same method to read the video BIOS, but since reading the video bios fails, the signature is obviously wrong) or just another symptom for the same problem (i.e. fglrx uses another method for reading the video bios, that works more or less, however switchable graphics is just quirky and the problem is somewhere else)? What is your opinion? Can you replicate the problem on your system? Is this specific to muxless solutions / laptop brands /AMD hybrid solutions? fyi: http://smackerelofopinion.blogspot.com/2011/07/using-pci-sysfs-interface-to-dump-video.html Thanks, Stefan _______________________________________________ Mailing list: https://launchpad.net/~hybrid-graphics-linux Post to : hybrid-graphics-linux@lists.launchpad.net Unsubscribe : https://launchpad.net/~hybrid-graphics-linux More help : https://help.launchpad.net/ListHelp
