{"id":523,"date":"2021-11-04T09:00:21","date_gmt":"2021-11-04T16:00:21","guid":{"rendered":"http:\/\/www.sysop.ca\/?p=523"},"modified":"2022-07-05T11:23:41","modified_gmt":"2022-07-05T18:23:41","slug":"display-flickering-slightly-on-lenovo-x270-fhd","status":"publish","type":"post","link":"http:\/\/www.sysop.ca\/?p=523","title":{"rendered":"Display flickering slightly on Lenovo X270 FHD"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">I recently purchased a used Lenovo X270 with the FHD (1920&#215;1080) panel and intel i915 graphics. I noticed in both Windows 10 and linux that the display was flickering slightly when I moved the mouse or typed on the keyboard. Even a progress dialog box caused a slight flicker with every update. The flickering was so slight that at first I thought it was my eyes playing tricks on me but after a while it really started to annoy me.<br \/><br \/>I checked for a loose cable issue or a hardware problem with the panel and found nothing obvious. I started to think I was going to have to return the system for a refund. While copying a file I noticed that the flickering appeared to be related to screen drawing or cpu events. Even moving the bluetooth mouse would cause a slight flickering. <br \/><br \/>After some searching I discovered that the integrated i915 graphics have a feature called <a href=\"https:\/\/www.anandtech.com\/show\/7208\/understanding-panel-self-refresh\">Panel Self Refresh or PSR<\/a>. It&#8217;s <br \/><br \/>The fix was as simple as adding a kernel argument to the i915 module to disable PSR at boot time.  On my Fedora 35 install this was fairly trivial using grubby:<br \/><br \/>sudo grubby &#8211;args=&#8221;i915.enable_psr=0&#8243; &#8211;update-kernel=ALL<br \/><br \/>After a reboot the flickering problem was gone. <br \/><br \/><\/p>\n","protected":false},"excerpt":{"rendered":"<p>I recently purchased a used Lenovo X270 with the FHD (1920&#215;1080) panel and intel i915 graphics. I noticed in both Windows 10 and linux that the display was flickering slightly when I moved the mouse or typed on the keyboard. Even a progress dialog box caused a slight flicker with every update. The flickering was &hellip; <\/p>\n<p class=\"link-more\"><a href=\"http:\/\/www.sysop.ca\/?p=523\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;Display flickering slightly on Lenovo X270 FHD&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,11,23],"tags":[],"class_list":["post-523","post","type-post","status-publish","format-standard","hentry","category-general","category-hardware","category-linux"],"_links":{"self":[{"href":"http:\/\/www.sysop.ca\/index.php?rest_route=\/wp\/v2\/posts\/523","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.sysop.ca\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.sysop.ca\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.sysop.ca\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.sysop.ca\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=523"}],"version-history":[{"count":2,"href":"http:\/\/www.sysop.ca\/index.php?rest_route=\/wp\/v2\/posts\/523\/revisions"}],"predecessor-version":[{"id":526,"href":"http:\/\/www.sysop.ca\/index.php?rest_route=\/wp\/v2\/posts\/523\/revisions\/526"}],"wp:attachment":[{"href":"http:\/\/www.sysop.ca\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=523"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.sysop.ca\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=523"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.sysop.ca\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=523"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}