Created attachment 116642 [details]
Platform: SKL Linux
Kernel - (4.1-rc8) 644bfe268feb04544d89b52edba6bef6a2661ddc
drm kernel merge : 2015y-06m-15d-16h-39m-55s
Libdrm - (2.4.61) a1acffd4e0968ffa65b673163574188a00c9ab7e
Mesa - (10.7.0-devel) 7518fc3c66e9b5703b987bccca7970a344deadfa
vaapi - (0.38.0) 4763db1c2133d4e6b92355938ecb6f23a7767b6b
libva - (1.6.0.pre1) 4763db1c2133d4e6b92355938ecb6f23a7767b6b
intel-driver (1.6.0.pre1) 4a1c4d21f3428b08ef765d7f7de75b97006514ac
eDP resolution used : 3840x2160
Bug detailed description:
3840 x 2160 resolution eDP panel is not lighting up in SKL-MBL.
But it getting detected in kernel. Attached the xrandr output( xrandr.log)
1. Boot the SKL with the above mentioned config with 3840x2160 eDP.
2. observe the eDP failure.
Created attachment 116643 [details]
[ 5.471830] i915 0000:00:02.0: Direct firmware load for i915/skl_dmc_ver1.bin failed with error -2
[ 5.471980] [drm:i915_firmware_load_error_print [i915]] *ERROR* failed to load firmware i915/skl_dmc_ver1.bin (0)
Please ensure you have dmc firmware from  properly installed.
Finding similar issue when loading the DUT with skl_dmc_ver1_18.bin. Attached the dmesg for your reference.
Created attachment 116820 [details]
(In reply to vijayakannan from comment #3)
> Finding similar issue when loading the DUT with skl_dmc_ver1_18.bin.
> Attached the dmesg for your reference.
Please reproduce using an upstream kernel, e.g. drm-intel-nightly branch of http://cgit.freedesktop.org/drm-intel
Please try to boot with i915.edp_vswing=1 or with i915.edp_vswing=2 as Kernel parameters. Do any of these solve your problem?
Bug scrub: looks like the same as #91269.
Let's Vijay answer to the question to confirm it.
Created attachment 117539 [details]
i915.edp_vswing=1 or with i915.edp_vswing=2 is not solving this problem. Added the dmesg in the Related Jira bug. Adding Xorg.log in for your reference.
(In reply to cprigent from comment #7)
> Bug scrub: looks like the same as #91269.
> Let's Vijay answer to the question to confirm it.
Christophe, please reference other bugs like this: bug 91269 so they get linked automagically. Thanks.
Created attachment 117827 [details] [review]
Could you please check if this patch helps?
Sorry for the delay. Issue is same with this patch.
Does this still occur? Can you attach the dmesg as well from when the failure occurs? See https://01.org/linuxgraphics/documentation/how-report-bugs
Can you test again with the latest drm-intel-nightly? I suspect this is due to cdclk being too low, but with the latest nightly we can now bump up the clock speed correctly. If it still fails, please attach full dmesg with the drm.debug=0xe option passed to the kernel.
The issue is not seen in SKL-Y platform with this configuration
Kernel version : 4.6.0-drm-intel-nightly-ww23-commit-fb023a2+
Linux distribution : Ubuntu 16.04 LTS
Architecture : 64-bit
Mesa version : 11.2.2 (git-3a9f628
xf86-video-intel version : 2.99.917
Xorg-Xserver version : 1.18.3
DRM version : 2.4.68
VAAPI version : Intel i965 driver for Intel(R) Skylake - 1.7.0
Cairo version : 1.15.2
Intel GPU Tools version : Tag [intel-gpu-tools-1.14-348-g303b380] / Commit [303b380]
Kernel driver in use : i915
Hardware acceleration : Enabled
Bios revision : 106.4
KSC revision : 1.20
Platform : SKL-Y to KBL (RVP3)
Motherboard model : Skylake Client platform
Motherboard type : Skylake Y LPDDR3 RVP3 Laptop
Motherboard manufacturer : Intel Corporation
CPU family : <OUT OF SPEC>
CPU information : Intel(R) Core(TM) m5-6Y57 CPU @ 1.10GHz
GPU Card : Intel Corporation Sky Lake Integrated Graphics (rev 07) (prog-if 00 [VGA controller])
Memory ram : 4 GB
Maximum memory ram allowed : 16 GB
CPU's number : 4
DMC fw loaded : yes
DMC version : 1.26
Author: Daniel Vetter <firstname.lastname@example.org>
Date: Mon May 30 10:46:14 2016 +0200
drm-intel-nightly: 2016y-05m-30d-08h-45m-53s UTC integration manifest
Kernel version : 4.6.0
Samsung 4K eDP 1.3 panel 15.6" 3840x2160 non touch (SKL BOM#3)
Created attachment 124287 [details]
Created attachment 124288 [details]
(In reply to maria guadalupe from comment #14)
> The issue is not seen in SKL-Y platform with this configuration
Thanks, closing. Please reopen if the problem persists with latest kernels.
I can't double confirm as my SKL as no eDP.
Closed. Please re-open if needed.