[haiku-bugs] Re: [Haiku] #8457: Blank screen after boot on Radeon Mobility 4670 HD
- From: "kallisti5" <trac@xxxxxxxxxxxx>
- Date: Mon, 01 Jul 2013 21:22:33 -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
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Comment (by kallisti5):
Your LVDS panel does have a GPIO hardware pin:
{{{
KERN: radeon_hd: Connector #0)
2138 KERN: radeon_hd: + connector: LVDS Panel
2139 KERN: radeon_hd: + gpio table id: 6
2140 KERN: radeon_hd: + gpio hw pin: 0x96
2141 KERN: radeon_hd: + gpio valid: true
2142 KERN: radeon_hd: + encoder: LVDS
2143 KERN: radeon_hd: - id: 33
2144 KERN: radeon_hd: - type: Internal Kaleidoscope
UNIPHY2
2145 KERN: radeon_hd: - enumeration: 1
2146 KERN: radeon_hd: - is bridge: false
2147 KERN: radeon_hd: + external encoder: none
2148 KERN: radeon_hd: + flags:
2149 KERN: radeon_hd: * device LCD1 support
}}}
Your logs show we are jumping directly to the LVDS_Info table.
{{{
KERN: radeon_hd: detect_displays: connector(0): found LVDS preferred mode
}}}
So! The logic should be changed. Instead of jumping directly to that
table, we should try to bit-bang an EDID from the LVDS gpio pin... if that
fails to produce a valid EDID, use the LVDS_Info (if it is an LVDS panel)
I can make the change, it may be a few days though as my free time is
short lately.
--
Ticket URL: <http://dev.haiku-os.org/ticket/8457#comment:34>
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