[Bug 79408] [HD Graphics 3000] frequent black screen on HDMI output

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=79408

--- Comment #3 from Mathieu <bugintel at pounains.homeip.net> ---
Thank you for taking time to respond.

I forgot to mention that I've installed an older ddx to see if the problem goes
away. Now, i'm back with the most current version available in my distro
(gentoo) :

[598382.917] (II) Module intel: vendor="X.Org Foundation"
[598382.917]    compiled for 1.15.0, module version = 2.99.911
[598382.917]    Module class: X.Org Video Driver
[598382.917]    ABI class: X.Org Video Driver, version 15.0

Also, I disabled TearFree. As a result, I now seeing tearing in the upper part
of the screen, and I still got the frequent black screen :(

Is it normal to see the EDID checksum errors ?
If I take the EDID that is dumped in the Xorg log, it is okay (checksum ok,
correct infos displayed). But I also see a some lines like that in the dmesg
output (some = 25 times in a 7 days uptime)

[599210.198083] [drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid,
remainder is 207
[599210.233511] [drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid,
remainder is 203
[599210.233515] Raw EDID:
[599210.233518]         00 ff ff ff ff ff ff 00 65 a8 73 31 00 00 00 00
[599210.233520]         00 16 01 03 80 00 00 78 0a 0d c9 a0 57 47 98 27
[599210.233522]         12 48 4c 00 00 00 01 01 01 01 01 01 01 01 01 01
[599210.233523]         01 01 01 01 01 01 01 1d 80 18 71 1c 16 20 58 2c
[599210.233525]         25 00 c4 8e 21 3f 3f 40 40 ff ff 00 00 00 00 00
[599210.233526]         00 00 ff ff 3d 3d ff ff 00 00 00 00 00 00 00 00
[599210.233528]         00 00 00 00 00 00 00 0a 20 20 20 20 00 00 00 fd
[599210.233530]         00 17 79 0f 5b 0f 00 0a 20 20 20 20 20 20 01 19
[599210.329346] [drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid,
remainder is 94
[604459.748941] [drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid,
remainder is 180
[604459.782970] [drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid,
remainder is 203
[604459.782977] Raw EDID:
[604459.782980]         00 ff ff ff ff ff ff 00 65 a8 73 31 00 00 00 00
[604459.782982]         00 16 01 03 80 00 00 78 0a 0d c9 a0 57 47 98 27
[604459.782984]         12 48 4c 00 00 00 01 01 01 01 01 01 01 01 01 01
[604459.782985]         01 01 01 01 01 01 01 1d 80 18 71 1c 16 20 58 2c
[604459.782987]         25 00 c4 8e 21 3f 3f 40 40 ff ff 00 00 00 00 00
[604459.782989]         00 00 ff ff 3d 3d ff ff 00 00 00 00 00 00 00 00
[604459.782990]         00 00 00 00 00 00 00 0a 20 20 20 20 00 00 00 fd
[604459.782992]         00 17 79 0f 5b 0f 00 0a 20 20 20 20 20 20 01 19
[615317.489681] [drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid,
remainder is 158
[615317.525021] [drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid,
remainder is 192
[615317.525025] Raw EDID:
[615317.525028]         00 ff ff ff ff ff ff 00 65 a8 73 31 00 00 00 00
[615317.525030]         00 16 01 03 80 00 00 78 0a 0d c9 a0 57 47 98 27
[615317.525032]         12 48 4c 00 00 00 01 01 01 01 01 01 01 01 01 01
[615317.525033]         01 01 01 01 01 01 01 1d 80 18 71 1c 16 20 58 2c
[615317.525035]         25 00 c4 8e 21 00 3f 3f 40 40 ff ff 00 00 00 00
[615317.525036]         00 00 ff ff ff 3d 3d ff ff 00 00 00 00 00 00 00
[615317.525038]         00 00 00 00 00 00 00 00 20 20 20 20 00 00 00 fd
[615317.525040]         00 17 79 0f 5b 0f 00 0a 20 20 20 20 20 20 01 19

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