[haiku-bugs] Re: [Haiku] #8457: Blank screen after boot on Radeon Mobility 4670 HD

  • From: "kallisti5" <trac@xxxxxxxxxxxx>
  • Date: Mon, 01 Jul 2013 21:04:41 -0000

#8457: Blank screen after boot on Radeon Mobility 4670 HD
   Reporter:  kvark                       |      Owner:  kallisti5
       Type:  bug                         |     Status:  new
   Priority:  normal                      |  Milestone:  R1
  Component:  Drivers/Graphics/radeon_hd  |    Version:  R1/Development
 Resolution:                              |   Keywords:  blank radeon
 Blocked By:                              |   Blocking:  7662
Has a Patch:  0                           |   Platform:  x86

Comment (by kallisti5):

 Replying to [comment:29 kvark]:
 > LCDPANEL_CAP_READ_EDID seems like it would be the answer, though the
 AtomBIOS dump shows ucLCDPanel_SpecialHandlingCap to be 0 :(

 Already looked at this.. the linux drm driver doesn't use that table.

 Replying to [comment:30 kvark]:
 > I'm going to work on a patch that adds the following check box to the
 fail-safe video modes list in the boot menu:
 > "Prefer additional VESA mode, if provided", checked by default.

 That seems like a fairly hacky hack. Wouldn't it be better to just boot
 from failsafe (vesa)?

 I'd focus on the drm driver to try and figure out what it is doing
 different.  I've reviewed the code and don't see anything different.  Let
 me ping AMD and see what they think.

Ticket URL: <http://dev.haiku-os.org/ticket/8457#comment:31>
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