Could the problem related to that one: https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/430919 The bug report is from 2009!
See also this thread here: http://web.archiveorange.com/archive/v/QiJNFgb92uLDyjGOtzBz Regards, Stefan 2011/9/17 Stefan Dröge <ste...@sdroege.de>: > 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
