<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - MMIO read of 00000000 FAULT at 022554 [ IBUS ]" href="https://bugs.freedesktop.org/show_bug.cgi?id=100423#c11">Comment # 11</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - MMIO read of 00000000 FAULT at 022554 [ IBUS ]" href="https://bugs.freedesktop.org/show_bug.cgi?id=100423">bug 100423</a> from <a class="email" href="mailto:alex-kas@privatecyberspace.net" title="Alex <alex-kas@privatecyberspace.net>"> Alex</a> <pre>Hi folks, I have the very similar issue about drm, bus read FAULT, etc. However, my problem is more severe than just red lines in dmesg. I have ideapad 700 with HD Graphics 530 as the integrated and GeForce GTX 950M as the discrete card. I sit on gentoo with Linux-4.15.1. The first point is that if I use nvidia drivers than my brightness buttons do not work (not visible for anything). Summing this up with the total no need of a powerful graphics I decided to go to the bumblebee just in case I will indeed need a better gpu in action. That is to fire up the discrete card on demand. My problem is that upon starting some glx-aware program at the moment when bumblebee is trying to start a separate hidden X server with nouveau as the driver my primary X server restarts. After this restart and in attempt to run some glx-aware program again I see X errors and nothing good. They boil down to the fact that drm cannot ecquire an access to card0 and card1 because of permission issues. Well, the primary X server now does not restart though. I tried all what bumblebee guys suggest - no way. Also, everything is smooth with the nvidia driver in this config. I think it is those red messages in dmesg are the primary indicator of my troubles.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the assignee for the bug.</li> </ul> </body> </html>