<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_REOPENED " title="REOPENED - [bdw-u iommu] DMAR error -> GPU hang" href="https://bugs.freedesktop.org/show_bug.cgi?id=89360#c103">Comment # 103</a> on <a class="bz_bug_link bz_status_REOPENED " title="REOPENED - [bdw-u iommu] DMAR error -> GPU hang" href="https://bugs.freedesktop.org/show_bug.cgi?id=89360">bug 89360</a> from <a class="email" href="mailto:osorio@uniovi.es" title="miguelramos <osorio@uniovi.es>"> miguelramos</a> <pre>(In reply to Ernest Hurtado from <a href="show_bug.cgi?id=89360#c101">comment #101</a>) > Before Linux 4.18 I could reproduce this bug on Broadwell and Skylake > hardware. On Linux 4.18 I can't reproduce this on Skylake anymore (after > months of testing). I can't test on Broadwell as my machine didn't lived as > long as this bug. I don't know which exact commits fixed this issue on > Skylake and why it doesn't work on Broadwell as other people reported. > > BTW: on Linux 4.19rc1-3 iommu is broken again for graphics but this is > unrelated issue which is being worked on. Hi, Ernest. At least in GentooLinux, I did not have the problem with Broadwell in kernel 4.18 and prior versions since 4.14.x. The machine is a Dell Inspiron 5540 laptop with Intel integrated graphics and a discrete AMD Topaz GPU. To get both providers working with PRIME, I had to have a conf file in /etc/X11/xorg.d/ declaring DRI "3" for the Intel xf86 video driver. The hang up problem with the Intel GPU has appeared for me since the 4.19.1 linux kernel. Now, I can get "gdm" working without any specific xorg driver conf file in /etc/X11/xorg.d/ and the workaround "intel_iommu=igfx_off". I can use both graphic cards with PRIME although the "modesetting" xf86 video driver doesn't yet work and I have to keep the old Intel xf86 video driver. This behaviour with previous kernels makes me suspect that the iommu breakage in 4.19rc1-3 you mention has something to do with the problem in Broadwell (at least in my laptop). Miguel Ángel</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> </ul> </body> </html>