On Wed, 06 Jan 2021, Imre Deak <imre.deak@xxxxxxxxx> wrote: > On Tue, Jan 05, 2021 at 05:50:41AM +0000, Matthew Wilcox wrote: >> On Tue, Dec 29, 2020 at 04:41:31PM +0200, Imre Deak wrote: >> > Hi, >> > >> > On Mon, Dec 21, 2020 at 04:07:58AM +0000, Matthew Wilcox wrote: >> > > >> > > At boot, >> > > >> > > [ 2.787995] [drm:lspcon_init [i915]] *ERROR* Failed to probe lspcon >> > > [ 2.788001] i915 0000:00:02.0: [drm] *ERROR* LSPCON init failed on port E >> > > [ 2.790752] ------------[ cut here ]------------ >> > > [ 2.790753] Missing case (clock == 539440) >> > > [ 2.790790] WARNING: CPU: 0 PID: 159 at drivers/gpu/drm/i915/display/intel_dpll_mgr.c:2967 icl_get_dplls+0x53a/0xa50 [i915] >> > >> > the above warn looks to be due to a missing workaround fixed by >> > >> > commit 0e2497e334de42dbaaee8e325241b5b5b34ede7e >> > Author: Imre Deak <imre.deak@xxxxxxxxx> >> > Date: Sat Oct 3 03:18:46 2020 +0300 >> > >> > drm/i915/tgl: Fix Combo PHY DPLL fractional divider for 38.4MHz ref clock >> > >> > in drm-tip. Could you give it a try? >> >> I tried -rc2, which contains that commit, and the problem is gone. Thank >> you! > > Thanks for testing it, I'll send a patch for the 5.10 stable tree as > well. > >> There is a different problem, which is that the brightness buttons >> (on F2 and F3 on this laptop) do not actually increase/decrease the >> brightness. GNOME pops up a graphic that illustrates it is changing >> the brightness, but nothing actually changes. >> >> xbacklight says "No outputs have backlight property" and using >> xrandr --output XWAYLAND0 --brightness 0.0001 doesn't change anything >> (for various different values, not just 0.0001). Using xrandr --prop >> --verbose shows the reported value of "Brightness" changing, but nothing >> has changed on the screen. >> >> I found >> /sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-eDP-1/intel_backlight >> and tried setting 'brightness' in there to a few different values (100, >> 2000, 19200, 7000) and also nothing changed. >> >> Any thoughts? > > One possibility is that from the different backlight methods (DPCD, > direct PWM on a CPU pin) the driver selects the incorrect one. Could you > provide a log booting with drm.debug=0x1e adding it to a new ticket at > > https://gitlab.freedesktop.org/drm/intel/-/issues/new?issue > > or at least in a reply to this thread? > > Adding Jani for further ideas. Please try: 1) i915.enable_dpcd_backlight=1 module param 2) https://cgit.freedesktop.org/drm/drm-tip drm-tip branch with patches from Lyude on top https://patchwork.freedesktop.org/series/81702/ BR, Jani. -- Jani Nikula, Intel Open Source Graphics Center _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
