On Sat, Jan 8, 2011 at 1:09 AM, Patrick Haller <[email protected]> wrote: > Hi, > > I've got two ViewSonic 930 LCDs attached to the DVI-0 and VGA-0 port of a > Sapphire Radeon 9600 XT. Using GIT master of xf86-video-ati on xorg-1.9.3 RC > 2 on Linux kernel 2.6.37 (gentoo). > > Experimenting with radeon.hw_i2c=1 caused the DVI-0 LCD to go black during > boot. To identify the cause of the problem, I exchanged the identical panels > with the effect that the 2nd LCD also went dead on DVI-0. Restarts and > operating system switches didn't help. > > Eventually, both panels kept working on VGA-0 with initial 1024x768 and > dmesg showed that the EDIDs of both panels were corrupt. > radeon.hw_i2c=1 seemingly has overwritten substantial parts of the the LCDs > EDID EEPROM with 0xff. (i2cdump) > > To my great relief, I was able to manually (using i2cset and a VP930 > reference EDID block) restore both EDID EEPROMS and got the panels working > fine again. > I'd not be too fond of retrying the whole procedure in order to ensure that > hw_i2c really was the culprit. > > Have I overlooked documented warning of using hw_i2c on this old board or > has anyone else experienced such?
It worked fine for me on all cards (r1xx-r5xx) and monitors I have. Alex > > > Thanks, > Patrick > _______________________________________________ [email protected]: X.Org support Archives: http://lists.freedesktop.org/archives/xorg Info: http://lists.freedesktop.org/mailman/listinfo/xorg Your subscription address: [email protected]
