On Mon, Sep 12, 2022 at 09:40:59AM +0200, Matthias Schmidt wrote: > Hi Jonathan, > > * Jonathan Gray wrote: > > On Mon, Sep 12, 2022 at 09:10:22AM +0200, Matthias Schmidt wrote: > > > >Synopsis: Display flickers upon touchpad movement > > > >Environment: > > > System : OpenBSD 7.2 > > > Details : OpenBSD 7.2 (GENERIC.MP) #720: Sun Sep 11 15:41:58 MDT > > > 2022 > > > > > > [email protected]:/usr/src/sys/arch/amd64/compile/GENERIC.MP > > > > > > Architecture: OpenBSD.amd64 > > > Machine : amd64 > > > >Description: > > > > > > Hi, > > > > > > I noticed a regression between 7.2-beta from Sept 6 and the current > > > snapshot. > > > As soon as I move the mouse with the trackpad the screen flickers. It > > > does not > > > happen if I use the keyboard. With all other snapshots before I never > > > had that > > > issue. I made a video for demonstration purposes: > > > > > > https://xosc.org/misc/flickr.mp4 > > > > > > [ At first, I move the mouse, then type on the keyboard and the screen > > > stops flickering, then switch to Firefox, move the mouse again and the > > > screen again starts to flicker ] > > > > > > Cheers > > > > > > Matthias > > > > > > >How-To-Repeat: > > > > > > Upgrade to latest snapshot on this type of machine. > > > > > > >Fix: > > > Dunno. > > > > some defaults for power saving features recently changed > > > > does this diff change what you see? > > Indeed, this fixes the issue for me. No more flickering here. > > Cheers and thanks a lot for the fast response! > > Matthias
Can you remove the lines added in the diff one at a time to figure out which specific parameter is involved? descriptions from i915_params.c: panel_use_ssc "Use Spread Spectrum Clock with panels [LVDS/eDP] " enable_dc "Enable power-saving display C-states. " enable_fbc "Enable frame buffer compression for power savings " enable_psr "Enable PSR " (Panel Self Refresh) disable_power_well "Disable display power wells when possible " enable_ips "Enable IPS" (Intermediate Pixel Storage)
