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On 2011/05/27 14:56 (GMT+0200) Marc Joliet composed: |
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> Kevin O'Gorman wrote: |
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>> ...The video card is an ATI Rage XL... |
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> I wonder which kernel version you use, because in 2.6.36/37 I was hit by a nasty |
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> EDID parsing bug. Actually, IIRC the code for parsing EDIDs was updated to |
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> understand more features or something, and that triggered errors that didn't |
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> come up before because those parts of the response from the monitor were simply |
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> ignored until then (or something like that). This lead to my own monitor not |
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> responding for over a minute at a time (sometimes going blank in between) and |
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> other people complained that it left theirs permanently blank. |
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> I think this is the original bug: |
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> https://bugs.freedesktop.org/show_bug.cgi?id=31943 |
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> which contains a workaround (with patch): |
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> "The drm EDID checker is pretty strict about what EDIDs it will accept. Try |
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> this patch and add drm.edid_strict=0 to your kernel command line." |
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> For me, upgrading to 2.6.38 helped, I don't see the problem anymore (though |
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> other people report otherwise). |
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> *If* this is the bug, it makes me wonder why you don't see it under Ubuntu. |
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I suspect the *buntu installer checks to see if the video chip is supported |
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for KMS, and applies nomodeset to Grub's cmdline when not. No ATI Rage* chip |
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is supported by KMS. With such an old laptop, could be he needs both |
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nomodeset and drm.edid_strict=0. I have a 1400x1050 Dell laptop that uses the |
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r128 driver, and its EDID is definitely broken. Whether I had the black |
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screen problem I don't remember, but it's very possible it's what caused me |
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to discover the existence of drm.edid_strict=0 in order to escape from either |
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an 800x600 X or black screens. |
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-- |
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"The wise are known for their understanding, and pleasant |
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words are persuasive." Proverbs 16:21 (New Living Translation) |
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Team OS/2 ** Reg. Linux User #211409 ** a11y rocks! |
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Felix Miata *** http://fm.no-ip.com/ |
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