Bug 57349 - [nouveau, EFI] xf86-video-nouveau-1.0.2 and above fail to find device with X 1.13.0
Summary: [nouveau, EFI] xf86-video-nouveau-1.0.2 and above fail to find device with X ...
Status: RESOLVED FIXED
Alias: None
Product: DRI
Classification: Unclassified
Component: DRM/other (show other bugs)
Version: XOrg git
Hardware: x86-64 (AMD64) Linux (All)
: medium normal
Assignee: Default DRI bug account
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Reported: 2012-11-20 22:36 UTC by Bruno
Modified: 2014-08-16 22:28 UTC (History)
0 users

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Description Bruno 2012-11-20 22:36:37 UTC 
Commit 2f48b8f462a03cb92db9e9a7ae1957eb27473965 "nouveau: add platform bus support" added in -1.0.2 prevents X from starting on a MacBookAir booted via EFI.

As debugged on IRC with airlied, the cause is that kernel reports "boot_vga" being "0" for the GeForce 9400M (C79) when efifb is not being used (not compiled into kernel whereas nouveau is). [booting with efifb built-in causes "boot_vga" to be "1"]

When there is no other GPU around and KMS (+ fbcon) is active on that GPU X should accept it as well (or kernel adjust boot_vga as needed even while efifb is not compiled in/used).

Kernel used if 3.7-rc5 (with efifb disabled), 3.7-rc6 (with efifb built-in)
Comment 1 Bruno 2014-08-16 22:28:24 UTC 
Fixed in 3.17-rc1 with commit 20cde694027e, though a fix for regression on multi-head Apple-EFI systems pending.

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