Bug 40841 - EDID information from TV not read
Summary: EDID information from TV not read
Alias: None
Product: DRI
Classification: Unclassified
Component: DRM/Intel (show other bugs)
Version: unspecified
Hardware: x86-64 (AMD64) Linux (All)
: medium normal
Assignee: Paulo Zanoni
QA Contact:
Depends on:
Reported: 2011-09-13 08:55 UTC by Alexander Hunziker
Modified: 2017-07-24 23:04 UTC (History)
6 users (show)

See Also:
i915 platform:
i915 features:


Description Alexander Hunziker 2011-09-13 08:55:18 UTC
I remember when I was connecting my laptop to my TV (via VGA) using earlier Ubuntu releases, I was offered to run it using it's native resolution (1368 by 768 or something like that). Now under Oneiric, I'm only offered 800x600 and 1024x768, which is unsatisfying. Running xrandr --verbose reveals that the laptop doesn't seem to receive the EDID information from the TV.

This was originally reported at https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/815978, where a lot of logs are attached.

Link to dmesg output with X debugging enabled: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/815978/+attachment/2361114/+files/dmesg_edid_problem.log
Comment 1 Alexander Hunziker 2011-09-13 09:00:53 UTC
This is on kernel 3.0 and xserver 1.10.4
Comment 2 Daniel Vetter 2012-02-08 07:38:18 UTC
Please try the latest kernel (preferably 3.3-rc1 or newer), boot the kernel with drm.debug=0xe attached to the cmdline, try to set a mode on the TV and then grab the full dmesg. Also please attach xrandr --verbose output on that new kernel while the TV is connected.
Comment 3 Daniel Vetter 2012-04-24 03:03:11 UTC
Original reporter seems to have gone amiss, closing as unreproducible. Please reopen if this is still an issue (in that case also please attach complete dmesg with drm.debug=0xe added to your kernel cmdline).

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