<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_REOPENED " title="REOPENED - [Regression BDW] backlight flickering/display artifacting on Broadwell integrated graphics with 4.12-rc1" href="https://bugs.freedesktop.org/show_bug.cgi?id=101111#c44">Comment # 44</a> on <a class="bz_bug_link bz_status_REOPENED " title="REOPENED - [Regression BDW] backlight flickering/display artifacting on Broadwell integrated graphics with 4.12-rc1" href="https://bugs.freedesktop.org/show_bug.cgi?id=101111">bug 101111</a> from <a class="email" href="mailto:n7u4722r35@ynzlx.anonbox.net" title="Mark Spencer <n7u4722r35@ynzlx.anonbox.net>"> Mark Spencer</a> <pre>This bug is strictly connected to i915.enable_psr=1 setting and it dates back to 4.6 kernel when it was enabled by default for BDW. See: <a class="bz_bug_link bz_status_CLOSED bz_closed" title="CLOSED FIXED - LCD flickering on Thinkpad T440p (Haswell) with kernel 4.6-rc4 (PSR enabled)" href="show_bug.cgi?id=95176">https://bugs.freedesktop.org/show_bug.cgi?id=95176</a> For example here is report which connects flickering with 40hz refresh rate, same thing which you asked me before: <a class="bz_bug_link bz_status_CLOSED bz_closed" title="CLOSED FIXED - LCD flickering on Thinkpad T440p (Haswell) with kernel 4.6-rc4 (PSR enabled)" href="show_bug.cgi?id=95176#c26">https://bugs.freedesktop.org/show_bug.cgi?id=95176#c26</a> It affected different machines and it's probably fixed for some of them. This bug report and <a class="bz_bug_link bz_status_REOPENED " title="REOPENED - [bdw regression 4.8] Severe graphics regression, rainbow glitching and flickering on Intel Broadwell 5500U integrated graphics" href="show_bug.cgi?id=97918">https://bugs.freedesktop.org/show_bug.cgi?id=97918</a> are about similar problem specific to Hp spectre x360 machine (could be connected to others but who knows). There are no such issues with i915.enable_psr=0.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are on the CC list for the bug.</li> <li>You are the QA Contact for the bug.</li> </ul> </body> </html>