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. --Imre _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
