On Fri, 01 Apr 2016, Rob Kramer <rob@xxxxxxxxxxxxxxxxxx> wrote: > Here's the same issue on a more reasonable kernel. The log looks quite > different, but the end result is still a blank screen. Uploaded here: > http://pastebin.com/WLpT5mPc > > This section looks promising: > > [ 4.763951] [drm:intel_dump_pipe_config] requested mode: > [ 4.763953] [drm:drm_mode_debug_printmodeline] Modeline 0:"1920x1080" > 60 148571 1920 2040 2080 2200 1080 1097 1108 1125 0x40 0xa > [ 4.763955] [drm:intel_dump_pipe_config] adjusted mode: > [ 4.763958] [drm:drm_mode_debug_printmodeline] Modeline 0:"1920x1080" > 60 148571 1920 2040 2080 2200 1080 1097 1108 1125 0x40 0xa > [ 4.763961] [drm:intel_dump_crtc_timings] crtc timings: 148571 1920 > 2040 2080 2200 1080 1097 1108 1125, type: 0x40 flags: 0xa > > .. but I don't know how relevant it is. I also have no idea where those > timings came from. > > Could anyone tell me what I could try next? Apr 1 11:32:21 vides user.err kernel: [ 4.896341] [drm:i9xx_crtc_compute_clock [i915]] *ERROR* Couldn't find PLL settings for mode! Please try without the kernel command line mode. BR, Jani. > > Cheers! > > Rob > > > On 04/01/2016 12:49 PM, Rob Kramer wrote: >> Hi, >> >> My setup is an embedded GM45 based board with a screen connected via >> 24 bit LVDS. When trying a to use a newer kernel (3.14.57) with KMS, >> the screen stays blank. I'm only testing KMS so far, no X. Older, >> pre-KMS versions of the kernel worked fine. >> >> I'm hoping that a resident Intel DRM guru has an idea of what might be >> wrong here, or can tell me where to continue troubleshooting :) >> >> I've uploaded a kernel log (drm.debug=0xe) here: >> http://pastebin.com/nYNRGW5B >> >> The video kernel parameter for this log is: video=LVDS-1:1920x1080. >> I've tried others, M and/or R suffixes, loading edid/1920x1080.bin >> etc, but nothing works. I'm not sure if all this EDID timing stuff is >> even used for LVDS.. >> >> One line in the log mentions a mode that is promising: >> >> [ 5.534021] [drm:intel_dump_crtc_timings], crtc timings: 148571 >> 1920 2040 2080 2200 1080 1097 1108 1125, type: 0x0 flags: 0xa >> >> In the BIOS, the panel type is configured as "1920x1080@148.5M", so >> that looks good. I have no idea where that modeline came from though. >> >> From what I can see, LVDS-1 and CRTC 3 are connected, but when it's >> time to set the mode, it seems to have been modified into a bogus >> adjusted mode: >> >> [ 5.570523] [drm:intel_dump_pipe_config], requested mode: >> [ 5.570525] [drm:drm_mode_debug_printmodeline], Modeline >> 0:"1920x1080" 0 172780 1920 2040 2248 2576 1080 1081 1084 1118 0x0 0x6 >> [ 5.570526] [drm:intel_dump_pipe_config], adjusted mode: >> [ 5.570529] [drm:drm_mode_debug_printmodeline], Modeline >> 0:"640x480" 0 148571 640 656 752 800 480 490 492 525 0x8 0x0 >> [ 5.570531] [drm:intel_dump_crtc_timings], crtc timings: 148571 >> 640 656 752 800 480 490 492 525, type: 0x8 flags: 0x0 >> >> Also, the dot-clock mentioned in the HD mode is now 172780, for some >> reason.. >> >> All sorts of kernel warnings follow, after this (what is LVDS-6?): >> >> [ 5.570569] [drm:intel_crtc_mode_set], [ENCODER:6:LVDS-6] set >> [MODE:0:1920x1080] >> >> Please let me know if you'd like more logging or details. >> >> Cheers, >> >> Rob >> > > _______________________________________________ > dri-devel mailing list > dri-devel@xxxxxxxxxxxxxxxxxxxxx > https://lists.freedesktop.org/mailman/listinfo/dri-devel -- Jani Nikula, Intel Open Source Technology Center _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
