Bug 81015
Summary: | radeon driver refuses to use dotclocks < 20Mhz | ||
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Product: | [Fedora] Fedora | Reporter: | Nils Philippsen <nphilipp> |
Component: | xorg-x11 | Assignee: | Mike A. Harris <mharris> |
Status: | CLOSED RAWHIDE | QA Contact: | |
Severity: | medium | Docs Contact: | |
Priority: | medium | ||
Version: | rawhide | Keywords: | FutureFeature |
Target Milestone: | --- | ||
Target Release: | --- | ||
Hardware: | athlon | ||
OS: | Linux | ||
Whiteboard: | |||
Fixed In Version: | Doc Type: | Enhancement | |
Doc Text: | Story Points: | --- | |
Clone Of: | Environment: | ||
Last Closed: | 2004-04-20 13:18:04 UTC | Type: | --- |
Regression: | --- | Mount Type: | --- |
Documentation: | --- | CRM: | |
Verified Versions: | Category: | --- | |
oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
Cloudforms Team: | --- | Target Upstream Version: | |
Embargoed: | |||
Bug Depends On: | |||
Bug Blocks: | 82776 | ||
Attachments: |
Description
Nils Philippsen
2003-01-03 14:49:57 UTC
Sample modeline to reproduce? Modeline "720x576" 13.875 720 744 808 888 576 582 588 625 -hsync -vsync interlace # H 15625 [Hz], V 50 [Hz] That's 720x576 PAL, let me know if you want an NTSC one -- I have some NTSC modelines, but they're not tested. Created attachment 89971 [details]
Patch that ensures a minimum dotclock of >= 12.5 Mhz
Do not use this at home kids. It might break your VGA card, your monitor or
even more.
Seriously: This patch forces the driver to use a minimum dotlock of 12.5 Mhz
(or less). I don't know if there are any Radeons that can't handle that (mine
does) and how they would react in that case. This should preferably be a
configuration option ('Option "EnsureTVDotClocks" "yes"'? -- we might have to
ensure that the max dotclock is at minimum 17.5 Mhz -- yeah right :o)), but I
don't know how to implement such options and I'm currently to busy/lazy to
figure out.
This type of thing would be a feature enhancement, and not really a bug fix. Due to the potentially hardware-damaging nature of such a change, I won't consider something like this for our current development. It's IMHO something that should be requested upstream in order to be given wider coverage. Setting to DEFERRED Created attachment 95161 [details]
Patch implementing an option to force a specific minimum dotclock on Radeon cards
This patch implements the "ForceMinDotclockenstein" option in the Radeon
driver. It accepts a frequency as its argument (like in "12.5Mhz"). This patch
documents the option in the radeon man page.
Created attachment 95511 [details]
Patch implementing an option to force a specific minimum dotclock on Radeon
cards
Revised patch as suggested by Kevin Martin:
- rename option to "ForceMinDotClock"
- fix code duplication
File this patch upstream, deferred. Fixed in xorg-x11-6.7.0-0.5. |