https://bugs.freedesktop.org/show_bug.cgi?id=55412
Priority: medium
Bug ID: 55412
Assignee: [email protected]
Summary: Screen turns black during boot after driver tries to
set mode on NV50
QA Contact: [email protected]
Severity: normal
Classification: Unclassified
OS: Linux (All)
Reporter: [email protected]
Hardware: x86-64 (AMD64)
Status: NEW
Version: git
Component: Driver/nouveau
Product: xorg
Created attachment 67816
--> https://bugs.freedesktop.org/attachment.cgi?id=67816&action=edit
kernel log without flags
The following commit on current nouveau git master breaks setting a valid
resolution at boot and results in a black screen.
commit 97d6852410a83e413d85649cb2cc10e17d6ee2ab
Author: Ben Skeggs <[email protected]>
Date: Thu Jul 26 08:51:21 2012 +1000
drm/nouveau/acpi: move definitions out of nouveau_drv.h
Signed-off-by: Ben Skeggs <[email protected]>
An interesting thing about this bug is that it can be avoided with adding the
kernel flag nouveau.reg_debug=0x600. With this flag a wrong resolution is set
at boot and the screen does not turn black. The X Server cannot start anyway.
My native resolution is 1366x768. GRUB_GFXMODE is 1360x768x32, since the
greater resolution is not listed in grub's vbeinfo.
nouveau and blob run X with 1366x768.
I will attach a log with and without the flag at commit
97d6852410a83e413d85649cb2cc10e17d6ee2ab.
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