<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - [NV96] Unable to handle page request from nv50_crtc_prepare" href="https://bugs.freedesktop.org/show_bug.cgi?id=86537#c5">Comment # 5</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - [NV96] Unable to handle page request from nv50_crtc_prepare" href="https://bugs.freedesktop.org/show_bug.cgi?id=86537">bug 86537</a> from <a class="email" href="mailto:pierre.morrow@free.fr" title="Pierre Moreau <pierre.morrow@free.fr>"> Pierre Moreau</a> <pre>(In reply to l3iggs from <a href="show_bug.cgi?id=86537#c4">comment #4</a>) > I've found a workaround for this bug (tested with 3.18-rc5): > > (1) Append 'modprobe.blacklist=nouveau' to the kernel boot parameters > This allows the system to boot. > (2) Once booted, as root, reset the 9600M GPU: 'echo 1 > > /sys/bus/pci/devices/0000:02:00.0/reset' > (3) 'echo 1 > /sys/bus/pci/devices/0000:02:00.0/rescan' > (4) 'modprobe nouveau' It does work indeed, and seems to solve some other issues related to that card (powering it down using vgaswitcheroo, suspending the laptop - resuming doesn't work though). > > Note that 0000:02:00.0 is the PCI bus address of my 9600M GT GPU, which I > learned by inspecting the output of lspci. > > The trick here is getting the GPU into the proper state before the nouveau > module is loaded. I've found that the internal state of the GPU can > frequently be inconsistent across reboots making troubleshooting difficult. > Resetting and then rescanning it before loading nouveau seems to solve > things for every scenario I've tested. > > With the above workaround I can start a display manager (GDM for gnome > 3.14.2) and everything seems to work as expected, ex. glxgears. > > The 9400M GPU can optionally be disabled between steps (3) and (4): 'echo 1 > > /sys/bus/pci/devices/0000:03:00.0/remove' > > where 0000:03:00.0 is the PCI address of my 9400M. vgaswitcheroo should be able to connect the integrated to the display (look at <a href="http://nouveau.freedesktop.org/wiki/Optimus/">http://nouveau.freedesktop.org/wiki/Optimus/</a>) using apple-gmux driver.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the assignee for the bug.</li> </ul> </body> </html>