<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - Failed to initialize GPU and Screen corruption at the top of the screen." href="https://bugs.freedesktop.org/show_bug.cgi?id=108103#c16">Comment # 16</a> on <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - Failed to initialize GPU and Screen corruption at the top of the screen." href="https://bugs.freedesktop.org/show_bug.cgi?id=108103">bug 108103</a> from <a class="email" href="mailto:galkin-vv@ya.ru" title="Vasily Galkin <galkin-vv@ya.ru>"> Vasily Galkin</a> <pre>I have the similar problem: black screen with j4105 cpu, that reproduces only with iommu enabled My ASRock-J4105-ITX board during boot is identified as DMI: To Be Filled By O.E.M. To Be Filled By O.E.M./J4105-ITX, BIOS P1.40 08/06/2018 Gpu in lspci is identified as 00:02.0 VGA compatible controller: Intel Corporation Device 3185 If I enable VT-d in the EFI Setup and intel_iommu=on parameter, than I have monitor becomes black (though, there is no gpu hang message) during X start (no any screen corruption). During the boot framebuffer console initializes, but contains an error message (on 4.19.5 debian kernel, on previous kernels the message telled something about GPU hang): i915 0000:00:02.0: Failed to initialize GPU, declaring it wedged! There is no error state: # cat /sys/class/drm/card0/error No error state collected Than boot continues using framebuffer console and at the moment of lightdm starting the screen becomes just black (ssh still works fine). Disabling intel_iommu completely solves the problem.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> <li>You are on the CC list for the bug.</li> <li>You are the assignee for the bug.</li> </ul> </body> </html>