<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - Delay when starting firefox, thunderbird or chromium and dmesg spam" href="https://bugs.freedesktop.org/show_bug.cgi?id=98502#c11">Comment # 11</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - Delay when starting firefox, thunderbird or chromium and dmesg spam" href="https://bugs.freedesktop.org/show_bug.cgi?id=98502">bug 98502</a> from <a class="email" href="mailto:eugene.shalygin+bugzilla.FDO@gmail.com" title="Eugene Shalygin <eugene.shalygin+bugzilla.FDO@gmail.com>"> Eugene Shalygin</a> <pre>I have the same problem: Qt5 wakes up dGPU on launch [1]. However, I believe that this is a kernel problem: the dGPU wakes up when a program tries to read from /sys/bus/pci/devices/<bus id>/config. This was not happening with 4.7 and when I use Arch's current LTS kernel (4.4) it also works fine [2]. I can't believe that this is intentional, because a) waking up dGPU on every program launch does not make any sense and b) when the dGPU is disable via acpi_call, any program hangs reading the same file. What puzzles me most is the following: I have two almost identical laptops (for this bug they can be treated as identical, I believe) and the second one, running Gentoo, is free from this problem with the same versions of kernel. Moreover, with kernel configured using config from the second one, the first one still shows the problematic behaviour. [1] <a href="https://bugs.archlinux.org/task/52452">https://bugs.archlinux.org/task/52452</a> [2] <a href="https://bugzilla.kernel.org/show_bug.cgi?id=194721">https://bugzilla.kernel.org/show_bug.cgi?id=194721</a></pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> <li>You are the assignee for the bug.</li> </ul> </body> </html>