Bug 24419 - Acer AL1916W EDID issues
Summary: Acer AL1916W EDID issues
Status: RESOLVED FIXED
Alias: None
Product: xorg
Classification: Unclassified
Component: Server/General (show other bugs)
Version: unspecified
Hardware: x86-64 (AMD64) Linux (All)
: medium normal
Assignee: Xorg Project Team
QA Contact: Xorg Project Team
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2009-10-09 06:59 UTC by Steven Wilson
Modified: 2010-03-19 21:53 UTC (History)
0 users

See Also:
i915 platform:
i915 features:


Attachments
radeon Xorg.0.log with no xorg.conf (39.37 KB, text/plain)
2009-10-09 06:59 UTC, Steven Wilson
no flags Details
Patch against 1.6.4 to add quirk (377 bytes, patch)
2009-10-12 02:48 UTC, Steven Wilson
no flags Details | Splinter Review

Description Steven Wilson 2009-10-09 06:59:04 UTC
Created attachment 30219 [details]
radeon Xorg.0.log with no xorg.conf

My Acer AL1916W appears to have some EDID issues that interfere with selecting a sane default mode. At a minimum, it appears that the first detailed timing mode is not flagged as the preferred mode. This mode works fine with radeon (when specified explicitly with a ModeLine and PreferredMode) and with fglrx (which selects it by default). With radeonhd it shows a blank screen.

Both radeon and radeonhd seem to select the 75Hz 1440x900 mode by default; with radeon this shows a blank screen, and with radeonhd the image is unstable. With fglrx this mode seems to be thrown out (not listed by xrandr).

FWIW, an .inf file is attached to https://bugzilla.redhat.com/show_bug.cgi?id=200572
Comment 1 Steven Wilson 2009-10-12 02:48:59 UTC
Created attachment 30283 [details] [review]
Patch against 1.6.4 to add quirk

I managed to figure out where the relevant quirk is defined and patched it in; seems to work nicely. For whatever reason, radeonhd seems to ignore the quirk (it's in the log, but it still defaults to the 75Hz mode). I made it against 1.6.4, and I'm not 100% sure on the formatting, but I'm happily running without xorg.conf.
Comment 2 Steven Wilson 2010-03-19 21:53:01 UTC
Closing; this seems to have been squashed sometime in the past few weeks, at least with KMS (which previously exhibited similar behavior). Both Fedora 13 Alpha and Lucid Beta 1 now have the 1440x900 75Hz mode working, whereas Lucid Alpha 3 still had the old behavior.


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