<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW --- - [snb efi gmux] imac 12,1 blank screen upon booting" href="https://bugs.freedesktop.org/show_bug.cgi?id=59431#c46">Comment # 46</a> on <a class="bz_bug_link bz_status_NEW " title="NEW --- - [snb efi gmux] imac 12,1 blank screen upon booting" href="https://bugs.freedesktop.org/show_bug.cgi?id=59431">bug 59431</a> from <a class="email" href="mailto:bobahu4@gmail.com" title="Vladimir <bobahu4@gmail.com>"> Vladimir</a> <pre>I found the exact commit that causes this bug <a href="http://kernel.ubuntu.com/git?p=ubuntu/ubuntu-quantal.git;a=commit;h=8f53b5444a25b5be3bfe0164316f9bc7845279c9">http://kernel.ubuntu.com/git?p=ubuntu/ubuntu-quantal.git;a=commit;h=8f53b5444a25b5be3bfe0164316f9bc7845279c9</a> drm/radeon: properly handle mc_stop/mc_resume on evergreen+ (v2) BugLink: <a href="http://bugs.launchpad.net/bugs/1091251">http://bugs.launchpad.net/bugs/1091251</a> commit 62444b7462a2b98bc78d68736c03a7c4e66ba7e2 upstream. - Stop the displays from accessing the FB - Block CPU access - Turn off MC client access This should fix issues some users have seen, especially with UEFI, when changing the MC FB location that result in hangs or display corruption. v2: fix crtc enabled check noticed by Luca Tettamanti Signed-off-by: Alex Deucher <<a href="mailto:alexander.deucher@amd.com">alexander.deucher@amd.com</a>> [ herton: adjust context ] Signed-off-by: Herton Ronaldo Krzesinski <<a href="mailto:herton.krzesinski@canonical.com">herton.krzesinski@canonical.com</a>> Hope you guys can fix it</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the assignee for the bug.</li> </ul> </body> </html>