<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - [bdw edp] Screen Flickering" href="https://bugs.freedesktop.org/show_bug.cgi?id=91393#c45">Comment # 45</a> on <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - [bdw edp] Screen Flickering" href="https://bugs.freedesktop.org/show_bug.cgi?id=91393">bug 91393</a> from <a class="email" href="mailto:furniss.tom@gmail.com" title="Tom Furniss <furniss.tom@gmail.com>"> Tom Furniss</a> <pre>Just wanted to summarise the progress against the original problem, which may or may not be related to some of these other issues, and to add some test detail. The original problem was a continually flickering screen, starting part-way through boot and prior to the login screen, and affected the extended display port of the laptop screen only, not external monitors. Mika's original patch fixed this issue, removing the flicker, but during QA Mika was asked to modify it to remove kernel parameters. Mika's revised (second) patch also resolved the issue. With both of Mika's patches there were still some graphics issues: 1) Initial blank screen on boot. 2) Occasional blinking of the graphics, ranging from every few seconds to every 2-3 minutes. The blink lasted only a fraction of a second, and whilst noticeable it wasn't a major concern. 3) The flickering returned when resuming from sleep. Issue 1 was a relatively common brightness issue, and was resolved by using kernel parameter acpi_osi=linux, and running this command automatically on startup, "setpci -s 00:02.0 F4.B=00". This also resolved issue 2, removing the occasional blink. Issue 3 remains.</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>