Bug 30029 - KMS makes LVDS extremely noisy without new_pll=0
Summary: KMS makes LVDS extremely noisy without new_pll=0
Status: RESOLVED FIXED
Alias: None
Product: xorg
Classification: Unclassified
Component: Driver/Radeon (show other bugs)
Version: 7.5 (2009.10)
Hardware: x86-64 (AMD64) Linux (All)
: medium normal
Assignee: xf86-video-ati maintainers
QA Contact: Xorg Project Team
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2010-09-05 04:29 UTC by Luca Niccoli
Modified: 2010-10-14 04:02 UTC (History)
0 users

See Also:
i915 platform:
i915 features:


Attachments
fix (1.79 KB, patch)
2010-09-07 08:41 UTC, Alex Deucher
no flags Details | Splinter Review

Description Luca Niccoli 2010-09-05 04:29:09 UTC
I'm trying KMS on my laptop with an HD3470; if I don't pass new_pll=0 as a parameter to the module, thin horizontal blue lines flash all around the laptop screen, both in X and in the console. A screen attached via HDMI is unaffected.
Comment 1 Alex Deucher 2010-09-07 08:41:58 UTC
Created attachment 38517 [details] [review]
fix

This patch should fix the issue.
Comment 2 Alexandre Derumier 2010-09-08 11:17:24 UTC
Hi, i'v a dell studio 15 laptop with rv620 chipset, 

i didn't have problem with new pll algo (last d-r-t kernel git,mesa git,libdrm-git,xf86-ati-git), with my internal lvds or external hdmi screen.


i think i have add this problem of blue lines at the beginning of new ppl around february, but it was solved:

http://bugs.freedesktop.org/show_bug.cgi?id=26358
Comment 3 Alex Deucher 2010-09-08 11:51:48 UTC
(In reply to comment #0)
> I'm trying KMS on my laptop with an HD3470; if I don't pass new_pll=0 as a
> parameter to the module, thin horizontal blue lines flash all around the laptop
> screen, both in X and in the console. A screen attached via HDMI is unaffected.

What kernel are you using?  Perhaps you are hitting the same bug Alexandre which was fixed in a newer kernel.  Can you try 2.6.35?
Comment 4 Luca Niccoli 2010-09-09 00:25:18 UTC
I'm already using 2.6.35...
Comment 5 Alex Deucher 2010-09-09 07:40:57 UTC
(In reply to comment #4)
> I'm already using 2.6.35...

Ok.  Then the patch should fix the issue for you.  Can you confirm?
Comment 6 Luca Niccoli 2010-10-14 04:02:33 UTC
(In reply to comment #5)

> Ok.  Then the patch should fix the issue for you.  Can you confirm?


Yes, it does (sorry for the delay)


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