Bug 4656 - Radeon driver does ignores Modelines when using digital displays
Summary: Radeon driver does ignores Modelines when using digital displays
Alias: None
Product: xorg
Classification: Unclassified
Component: Driver/Radeon (show other bugs)
Version: 6.8.2
Hardware: x86 (IA32) Linux (All)
: high major
Assignee: Xorg Project Team
QA Contact:
Depends on:
Blocks: 2859
  Show dependency treegraph
Reported: 2005-10-01 03:57 UTC by Ulrich Gemkow
Modified: 2007-02-22 02:54 UTC (History)
2 users (show)

See Also:
i915 platform:
i915 features:


Description Ulrich Gemkow 2005-10-01 03:57:51 UTC
The Radeon driver ignores ModeLines when using digital displays. The reasoning
behind this is understandable (see comments in source) but user settings should
always be honored.

This prevents i.e. reducing the clock where appropriate (Notebooks)

Probably an "override" option could be provided.
Comment 1 Adam Jackson 2005-11-30 17:13:00 UTC
don't see why this is blocking #2859.
Comment 2 Ulrich Gemkow 2005-11-30 19:10:39 UTC
(In reply to comment #1)
> don't see why this is blocking #2859.

Because the currently accepted solution for bug 2859 is to change the
modeline to reduce the blanking times. And the driver currently does
not allow this - it ignores modelines for digital displays.

So solving this bug would allow users to use digital displays with
radeons without patching the driver (which is not an option for
regular users).
Comment 3 Benjamin Herrenschmidt 2005-12-01 11:15:11 UTC
It doesn't exactly ignore modelines... Note also that 2859 may be a different
issue, I've been asking for more tests but the users never replied.
Comment 4 Timo Jyrinki 2007-02-22 02:54:04 UTC
No updates for 1,5 years, and using ModeLines on my DVI output works. Marking as fixed, reopen if necessary.

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