[Bug 93226] New: drm_kms_helper.edid / EDID not working as expected

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93226

            Bug ID: 93226
           Summary: drm_kms_helper.edid / EDID not working as expected
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/intel
          Assignee: chris at chris-wilson.co.uk
          Reporter: alex at znirp.de
        QA Contact: intel-gfx-bugs at lists.freedesktop.org

Hi,

first: I hope I've choosen the correct category for my bug.
Actually I'm facing an issue with drm_kms_helper.edid, which is not working
correctly.
OS is Ubuntu LTS 14.04.

What I Did:

###########

To get video and sound I'm using actual kernel 4.4-rc2

###########

sudo mkdir -p /lib/firmware/edid
sudo cp /sys/class/drm/card0-HDMI-A-2/edid /lib/firmware/edid/edid.bin

EDID file is exactly 256 Bytes long. 

###########

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash video=HDMI-A-2:1920x1080 at 60D
drm_kms_helper.edid_firmware=HDMI-A-2:edid/edid.bin"

Afterwards ran update-grub

root at kodi:~# cat /proc/cmdline
BOOT_IMAGE=/vmlinuz-4.4.0-040400rc2-generic root=/dev/mapper/live--vg-root ro
quiet splash video=HDMI-A-2:1920x1080 at 60D
drm_kms_helper.edid_firmware=HDMI-A-2:edid/edid.bin vt.handoff=7

###########

Additionally I used a initramfs hook to integrate EDID within the initramfs
(/etc/initramfs-tools/hooks/include-edid-data):

#!/bin/sh

PREREQ="udev"
prereqs()
{
   echo "$PREREQ"
}

case $1 in
prereqs)
   prereqs
   exit 0
   ;;
esac

. /usr/share/initramfs-tools/hook-functions
# Begin real processing below this line

if [ ! -e "${DESTDIR}/lib/firmware/edid" ]; then
    mkdir -p "${DESTDIR}/lib/firmware/edid"
fi

if [ -r "/lib/firmware/edid/edid.bin" ]; then
   cp "/lib/firmware/edid/edid.bin" "${DESTDIR}/lib/firmware/edid/"
fi

manual_add_modules i915 radeon
exit 0

After that, I'd made it executable and ran: update-initramfs -u

###########

So far everything is working like expected. When I reboot I've got picture and
sound.
What's not working is, when my PC turns on (without my TV and my AVR) and I
turn on both (AVR+TV) later (e.g. one hour later), I got no picture and no
sound.

Syslog is telling me:

Dec  3 13:27:14 kodi kernel: [ 3486.786132] [drm:drm_edid_block_valid [drm]]
*ERROR* EDID checksum is invalid, remainder is 15
Dec  3 13:27:14 kodi kernel: [ 3486.786135] Raw EDID:
Dec  3 13:27:14 kodi kernel: [ 3486.786136]     00 ff ff ff ff ff ff 00 11 ee
27 00 01 01 01 01
Dec  3 13:27:14 kodi kernel: [ 3486.786137]     00 15 01 03 80 50 2d 78 0a 0d
c9 a0 57 47 98 27
Dec  3 13:27:14 kodi kernel: [ 3486.786138]     12 48 4c 20 00 00 01 01 01 01
01 01 01 01 01 01
Dec  3 13:27:14 kodi kernel: [ 3486.786139]     ff ff ff ff ff ff ff ff ff ff
ff ff ff ff ff ff
Dec  3 13:27:14 kodi kernel: [ 3486.786139]     ff ff ff ff ff ff ff ff ff ff
ff ff ff ff ff ff
Dec  3 13:27:14 kodi kernel: [ 3486.786140]     ff ff ff ff ff ff ff ff ff ff
ff ff ff ff ff ff
Dec  3 13:27:14 kodi kernel: [ 3486.786141]     ff ff ff ff ff ff ff ff ff ff
ff ff ff ff ff ff
Dec  3 13:27:14 kodi kernel: [ 3486.786142]     ff ff ff ff ff ff ff ff ff ff
ff ff ff ff ff ff
Dec  3 13:27:14 kodi kernel: [ 3486.798655] EDID block is all zeroes
Dec  3 13:27:14 kodi kernel: [ 3486.811157] EDID block is all zeroes
Dec  3 13:27:14 kodi kernel: [ 3486.823662] EDID block is all zeroes
Dec  3 13:27:14 kodi kernel: [ 3486.823667] i915 0000:00:02.0: HDMI-A-2: EDID
block 0 invalid.
Dec  3 13:27:14 kodi kernel: [ 3486.823740] [drm] Got external EDID base block
and 1 extension from "edid/edid.bin" for connector "HDMI-A-2"
Dec  3 13:27:19 kodi kernel: [ 3491.873675] [drm] Got external EDID base block
and 1 extension from "edid/edid.bin" for connector "HDMI-A-2"
Dec  3 13:27:19 kodi kernel: [ 3491.960732] [drm] Got external EDID base block
and 1 extension from "edid/edid.bin" for connector "HDMI-A-2"
Dec  3 13:27:19 kodi kernel: [ 3492.007403] [drm] Got external EDID base block
and 1 extension from "edid/edid.bin" for connector "HDMI-A-2"
Dec  3 13:27:19 kodi kernel: [ 3492.069470] [drm] Got external EDID base block
and 1 extension from "edid/edid.bin" for connector "HDMI-A-2"


If you need further information or explanation, please let me know.
Hoping someone can help me solving this issue.

Thanks in advance.

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