Bug 217355 - radeon driver misconfigures AGP mode
Summary: radeon driver misconfigures AGP mode
Alias: None
Product: Fedora
Classification: Fedora
Component: xorg-x11-drv-ati
Version: 5
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Adam Jackson
QA Contact:
Keywords: Patch
Depends On:
TreeView+ depends on / blocked
Reported: 2006-11-27 13:21 UTC by Alex W. Jackson
Modified: 2007-11-30 22:11 UTC (History)
0 users

Clone Of:
Last Closed: 2007-04-02 21:18:28 UTC

Attachments (Terms of Use)
Radeon AGPv3 mode patch (600 bytes, patch)
2006-11-27 13:21 UTC, Alex W. Jackson
no flags Details | Diff

Description Alex W. Jackson 2006-11-27 13:21:05 UTC
Description of problem:
The radeon driver sets the wrong bits when attempting to set AGP 8x mode,
resulting in a lockup when starting X (or a warning in /var/log/messages on
newer Fedora kernels that have a workaround for this bug)

Version-Release number of selected component (if applicable):

How reproducible:
Always, if you have suitable hardware (any AGPv3 Radeon--e.g. RV280)

Steps to Reproduce:
1. Install AGPv3 Radeon card
2. Set AGP speed to 8x in BIOS
3. Boot system
4. Log into X
5. After logging in (or lockup) look at /var/log/messages
Actual results:
As can be seen in /var/log/messages, driver attempts to set nonexistent "AGP
12x" mode, resulting in either lockup or warning message, depending on kernel.

Expected results:
Driver should correctly set AGP 8x mode.

Additional info:
kernel-2.6.18-1.2200_FC5 (and later) contains a workaround for this bug, but
given the triviality of the fix (see attached patch, which I backported from
xorg cvs) I think it's better if we just stamp it out at the source.

Comment 1 Alex W. Jackson 2006-11-27 13:21:05 UTC
Created attachment 142165 [details]
Radeon AGPv3 mode patch

Comment 2 Adam Jackson 2007-04-02 21:18:28 UTC
Already included in the radeon driver in FC7, closing.  Thanks for the report!

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